Ubuntu Security Advisories

USN-4432-2: GRUB2 regression

1 hour 38 minutes ago
grub2, grub2-signed regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM
Summary

USN-4432-1 introduced a regression in the GRUB2 bootloader.

Software Description
  • grub2 - GRand Unified Bootloader
  • grub2-signed - GRand Unified Bootloader
Details

USN-4432-1 fixed vulnerabilities in GRUB2 affecting Secure Boot environments. Unfortunately, the update introduced regressions for some BIOS systems (either pre-UEFI or UEFI configured in Legacy mode), preventing them from successfully booting. This update addresses the issue.

Users with BIOS systems that installed GRUB2 versions from USN-4432-1 should verify that their GRUB2 installation has a correct understanding of their boot device location and installed the boot loader correctly.

We apologize for the inconvenience.

Original advisory details:

Jesse Michael and Mickey Shkatov discovered that the configuration parser in GRUB2 did not properly exit when errors were discovered, resulting in heap-based buffer overflows. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-10713)

Chris Coulson discovered that the GRUB2 function handling code did not properly handle a function being redefined, leading to a use-after-free vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-15706)

Chris Coulson discovered that multiple integer overflows existed in GRUB2 when handling certain filesystems or font files, leading to heap-based buffer overflows. A local attacker could use these to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-14309, CVE-2020-14310, CVE-2020-14311)

It was discovered that the memory allocator for GRUB2 did not validate allocation size, resulting in multiple integer overflows and heap-based buffer overflows when handling certain filesystems, PNG images or disk metadata. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-14308)

Mathieu Trudel-Lapierre discovered that in certain situations, GRUB2 failed to validate kernel signatures. A local attacker could use this to bypass Secure Boot restrictions. (CVE-2020-15705)

Colin Watson and Chris Coulson discovered that an integer overflow existed in GRUB2 when handling the initrd command, leading to a heap-based buffer overflow. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-15707)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
grub-efi-amd64-bin - 2.04-1ubuntu26.2
grub-efi-amd64-signed - 1.142.4+2.04-1ubuntu26.2
grub-efi-arm-bin - 2.04-1ubuntu26.2
grub-efi-arm64-bin - 2.04-1ubuntu26.2
grub-efi-arm64-signed - 1.142.4+2.04-1ubuntu26.2
grub-efi-ia32-bin - 2.04-1ubuntu26.2
Ubuntu 18.04 LTS
grub-efi-amd64-bin - 2.02-2ubuntu8.17
grub-efi-amd64-signed - 1.93.19+2.02-2ubuntu8.17
grub-efi-arm-bin - 2.02-2ubuntu8.17
grub-efi-arm64-bin - 2.02-2ubuntu8.17
grub-efi-arm64-signed - 1.93.19+2.02-2ubuntu8.17
grub-efi-ia32-bin - 2.02-2ubuntu8.17
grub-efi-ia64-bin - 2.02-2ubuntu8.17
Ubuntu 16.04 LTS
grub-efi-amd64-bin - 2.02~beta2-36ubuntu3.27
grub-efi-amd64-signed - 1.66.27+2.02~beta2-36ubuntu3.27
grub-efi-arm-bin - 2.02~beta2-36ubuntu3.27
grub-efi-arm64-bin - 2.02~beta2-36ubuntu3.27
grub-efi-arm64-signed - 1.66.27+2.02~beta2-36ubuntu3.27
grub-efi-ia32-bin - 2.02~beta2-36ubuntu3.27
grub-efi-ia64-bin - 2.02~beta2-36ubuntu3.27
Ubuntu 14.04 ESM
grub-efi-amd64-bin - 2.02~beta2-9ubuntu1.17
grub-efi-amd64-signed - 1.34.20+2.02~beta2-9ubuntu1.17
grub-efi-arm-bin - 2.02~beta2-9ubuntu1.17
grub-efi-arm64-bin - 2.02~beta2-9ubuntu1.17
grub-efi-ia32-bin - 2.02~beta2-9ubuntu1.17
grub-efi-ia64-bin - 2.02~beta2-9ubuntu1.17

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Fully mitigating these vulnerabilities requires both an updated GRUB2 boot loader and the application of a UEFI Revocation List (dbx) to system firmware. Ubuntu will provide a packaged dbx update at a later time, though system adminstrators may choose to apply a third party dbx update before then. For more details on mitigation steps and the risks entailed (especially for dual/multi-boot scenarios), please see the Knowledge Base article at https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass

References

USN-4452-1: libvirt vulnerability

5 hours 25 minutes ago
libvirt vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
Summary

libvirt could be made to run programs as an administrator.

Software Description
  • libvirt - Libvirt virtualization toolkit
Details

Trent Shea discovered that the libvirt package set incorrect permissions on the UNIX domain socket. A local attacker could use this issue to access libvirt and escalate privileges.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
libvirt-daemon - 6.0.0-0ubuntu8.3
libvirt-daemon-system - 6.0.0-0ubuntu8.3
libvirt0 - 6.0.0-0ubuntu8.3

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

References

USN-4451-1: ppp vulnerability

5 hours 35 minutes ago
ppp vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

ppp could be made to load arbitrary kernel modules and possibly run programs.

Software Description
  • ppp - Point-to-Point Protocol (PPP)
Details

Thomas Chauchefoin discovered that ppp incorrectly handled module loading. A local attacker could use this issue to load arbitrary kernel modules and possibly execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
ppp - 2.4.7-2+4.1ubuntu5.1
Ubuntu 18.04 LTS
ppp - 2.4.7-2+2ubuntu1.3
Ubuntu 16.04 LTS
ppp - 2.4.7-1+2ubuntu1.16.04.3

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4450-1: Whoopsie vulnerabilities

5 hours 42 minutes ago
whoopsie vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

Several security issues were fixed in whoopsie.

Software Description
  • whoopsie - Ubuntu error tracker submission
Details

Seong-Joong Kim discovered that Whoopsie incorrectly handled memory. A local attacker could use this issue to cause Whoopsie to consume memory, resulting in a denial of service. (CVE-2020-11937)

Seong-Joong Kim discovered that Whoopsie incorrectly handled parsing files. A local attacker could use this issue to cause Whoopsie to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-12135)

Seong-Joong Kim discovered that Whoopsie incorrectly handled memory. A local attacker could use this issue to cause Whoopsie to consume memory, resulting in a denial of service. (CVE-2020-15570)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
libwhoopsie0 - 0.2.69ubuntu0.1
whoopsie - 0.2.69ubuntu0.1
Ubuntu 18.04 LTS
libwhoopsie0 - 0.2.62ubuntu0.5
whoopsie - 0.2.62ubuntu0.5
Ubuntu 16.04 LTS
libwhoopsie0 - 0.2.52.5ubuntu0.5
whoopsie - 0.2.52.5ubuntu0.5

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4449-1: Apport vulnerabilities

5 hours 51 minutes ago
apport vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

Several security issues were fixed in Apport.

Software Description
  • apport - automatically generate crash reports for debugging
Details

Ryota Shiga discovered that Apport incorrectly dropped privileges when making certain D-Bus calls. A local attacker could use this issue to read arbitrary files. (CVE-2020-11936)

Seong-Joong Kim discovered that Apport incorrectly parsed configuration files. A local attacker could use this issue to cause Apport to crash, resulting in a denial of service. (CVE-2020-15701)

Ryota Shiga discovered that Apport incorrectly implemented certain checks. A local attacker could use this issue to escalate privileges and run arbitrary code. (CVE-2020-15702)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
apport - 2.20.11-0ubuntu27.6
python3-apport - 2.20.11-0ubuntu27.6
Ubuntu 18.04 LTS
apport - 2.20.9-0ubuntu7.16
python-apport - 2.20.9-0ubuntu7.16
python3-apport - 2.20.9-0ubuntu7.16
Ubuntu 16.04 LTS
apport - 2.20.1-0ubuntu2.24
python-apport - 2.20.1-0ubuntu2.24
python3-apport - 2.20.1-0ubuntu2.24

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4448-1: Tomcat vulnerabilities

6 hours ago
tomcat8 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS
Summary

Several security issues were fixed in Tomcat.

Software Description
  • tomcat8 - Servlet and JSP engine
Details

It was discovered that Tomcat incorrectly validated the payload length in a WebSocket frame. A remote attacker could possibly use this issue to cause Tomcat to hang, resulting in a denial of service. (CVE-2020-13935)

It was discovered that Tomcat incorrectly handled HTTP header parsing. In certain environments where Tomcat is located behind a reverse proxy, a remote attacker could possibly use this issue to perform HTTP Reqest Smuggling. (CVE-2020-1935)

It was discovered that Tomcat incorrectly handled certain uncommon PersistenceManager with FileStore configurations. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2020-9484)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04 LTS
libtomcat8-java - 8.0.32-1ubuntu1.13
tomcat8 - 8.0.32-1ubuntu1.13

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4447-1: libssh vulnerability

9 hours 26 minutes ago
libssh vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

libssh could be made to crash if it received a specially crafted request.

Software Description
  • libssh - None
Details

It was discovered that libssh incorrectly handled certain requests. An attacker could possibly use this issue to cause a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
libssh-4 - 0.9.3-2ubuntu2.1
Ubuntu 18.04 LTS
libssh-4 - 0.8.0~20170825.94fa1e38-1ubuntu0.7
Ubuntu 16.04 LTS
libssh-4 - 0.6.3-4.3ubuntu0.6

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4298-2: SQLite vulnerabilities

1 day 4 hours ago
sqlite3 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 14.04 ESM
Summary

Several security issues were fixed in SQLite.

Software Description
  • sqlite3 - C library that implements an SQL database engine
Details

USN-4298-1 fixed several vulnerabilities in SQLite. This update provides the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that SQLite incorrectly handled certain shadow tables. An attacker could use this issue to cause SQLite to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2019-13734, CVE-2019-13750, CVE-2019-13752, CVE-2019-13753)

It was discovered that SQLite incorrectly handled certain corrupt records. An attacker could use this issue to cause SQLite to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2019-13751)

It was discovered that SQLite incorrectly handled errors during parsing. An attacker could use this issue to cause SQLite to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2019-19926)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.04 ESM
libsqlite3-0 - 3.8.2-1ubuntu2.2+esm2
sqlite3 - 3.8.2-1ubuntu2.2+esm2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4446-1: Squid vulnerabilities

1 day 9 hours ago
squid3 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

Several security issues were fixed in Squid.

Software Description
  • squid3 - Web proxy cache server
Details

Jeriko One discovered that Squid incorrectly handled caching certain requests. A remote attacker could possibly use this issue to perform cache-injection attacks or gain access to reverse proxy features such as ESI. (CVE-2019-12520)

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled certain URN requests. A remote attacker could possibly use this issue to bypass access checks. (CVE-2019-12523)

Jeriko One discovered that Squid incorrectly handled URL decoding. A remote attacker could possibly use this issue to bypass certain rule checks. (CVE-2019-12524)

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled input validation. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2019-18676)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
squid - 3.5.27-1ubuntu1.7
Ubuntu 16.04 LTS
squid - 3.5.12-1ubuntu7.12

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4445-1: Ghostscript vulnerability

1 day 9 hours ago
ghostscript vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
Summary

Ghostscript could be made to crash, access files, or run programs if it opened a specially crafted file.

Software Description
  • ghostscript - PostScript and PDF interpreter
Details

It was discovered that Ghostscript incorrectly handled certain PostScript files. If a user or automated system were tricked into processing a specially crafted file, a remote attacker could possibly use this issue to access arbitrary files, execute arbitrary code,

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
ghostscript - 9.50~dfsg-5ubuntu4.1
libgs9 - 9.50~dfsg-5ubuntu4.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4444-1: WebKitGTK vulnerabilities

1 day 10 hours ago
webkit2gtk vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
Summary

Several security issues were fixed in WebKitGTK.

Software Description
  • webkit2gtk - Web content engine library for GTK+
Details

A large number of security issues were discovered in the WebKitGTK Web and JavaScript engines. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
libjavascriptcoregtk-4.0-18 - 2.28.4-0ubuntu0.20.04.1
libwebkit2gtk-4.0-37 - 2.28.4-0ubuntu0.20.04.1
Ubuntu 18.04 LTS
libjavascriptcoregtk-4.0-18 - 2.28.4-0ubuntu0.18.04.1
libwebkit2gtk-4.0-37 - 2.28.4-0ubuntu0.18.04.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

This update uses a new upstream release, which includes additional bug fixes. After a standard system update you need to restart any applications that use WebKitGTK, such as Epiphany, to make all the necessary changes.

References

USN-4440-1: linux kernel vulnerabilities

4 days 21 hours ago
linux-hwe, linux-aws-5.3, linux-azure-5.3, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-oracle-5.3, linux-raspi2-5.3 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS
Summary

Several security issues were fixed in the Linux kernel.

Software Description
  • linux-aws-5.3 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure-5.3 - Linux kernel for microsoft azure cloud systems
  • linux-gcp-5.3 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-oracle-5.3 - Linux kernel for Oracle Cloud systems
  • linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V7) systems
Details

It was discovered that the network block device (nbd) implementation in the Linux kernel did not properly check for error conditions in some situations. An attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-16089)

It was discovered that the kernel->user space relay implementation in the Linux kernel did not properly check return values in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-19462)

Chuhong Yuan discovered that go7007 USB audio device driver in the Linux kernel did not properly deallocate memory in some failure conditions. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-20810)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading SSDT code from an EFI variable. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)

It was discovered that the elf handling code in the Linux kernel did not initialize memory before using it in certain situations. A local attacker could use this to possibly expose sensitive information (kernel memory). (CVE-2020-10732)

Fan Yang discovered that the mremap implementation in the Linux kernel did not properly handle DAX Huge Pages. A local attacker with access to DAX storage could use this to gain administrative privileges. (CVE-2020-10757)

It was discovered that the Linux kernel did not correctly apply Speculative Store Bypass Disable (SSBD) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10766)

It was discovered that the Linux kernel did not correctly apply Indirect Branch Predictor Barrier (IBPB) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10767)

It was discovered that the Linux kernel could incorrectly enable indirect branch speculation after it has been disabled for a process via a prctl() call. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10768)

Mauricio Faria de Oliveira discovered that the aufs implementation in the Linux kernel improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service. (CVE-2020-11935)

It was discovered that the Virtual Terminal keyboard driver in the Linux kernel contained an integer overflow. A local attacker could possibly use this to have an unspecified impact. (CVE-2020-13974)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading ACPI tables via configfs. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
linux-image-5.3.0-1030-oracle - 5.3.0-1030.32~18.04.1
linux-image-5.3.0-1030-raspi2 - 5.3.0-1030.32~18.04.2
linux-image-5.3.0-1032-aws - 5.3.0-1032.34~18.04.2
linux-image-5.3.0-1032-gcp - 5.3.0-1032.34~18.04.1
linux-image-5.3.0-1032-gke - 5.3.0-1032.34~18.04.1
linux-image-5.3.0-1034-azure - 5.3.0-1034.35~18.04.1
linux-image-5.3.0-64-generic - 5.3.0-64.58~18.04.1
linux-image-5.3.0-64-generic-lpae - 5.3.0-64.58~18.04.1
linux-image-5.3.0-64-lowlatency - 5.3.0-64.58~18.04.1
linux-image-aws - 5.3.0.1032.31
linux-image-azure - 5.3.0.1034.30
linux-image-gcp - 5.3.0.1032.26
linux-image-gke-5.3 - 5.3.0.1032.17
linux-image-gkeop-5.3 - 5.3.0.64.120
linux-image-oracle - 5.3.0.1030.27
linux-image-raspi2-hwe-18.04 - 5.3.0.1030.20

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References

USN-4432-1: GRUB 2 vulnerabilities

6 days 4 hours ago
grub2, grub2-signed vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM
Summary

Several security issues were fixed in GRUB 2.

Software Description
  • grub2 - GRand Unified Bootloader
  • grub2-signed - GRand Unified Bootloader
Details

Jesse Michael and Mickey Shkatov discovered that the configuration parser in GRUB2 did not properly exit when errors were discovered, resulting in heap-based buffer overflows. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-10713)

Chris Coulson discovered that the GRUB2 function handling code did not properly handle a function being redefined, leading to a use-after-free vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-15706)

Chris Coulson discovered that multiple integer overflows existed in GRUB2 when handling certain filesystems or font files, leading to heap-based buffer overflows. A local attacker could use these to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-14309, CVE-2020-14310, CVE-2020-14311)

It was discovered that the memory allocator for GRUB2 did not validate allocation size, resulting in multiple integer overflows and heap-based buffer overflows when handling certain filesystems, PNG images or disk metadata. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-14308)

Mathieu Trudel-Lapierre discovered that in certain situations, GRUB2 failed to validate kernel signatures. A local attacker could use this to bypass Secure Boot restrictions. (CVE-2020-15705)

Colin Watson and Chris Coulson discovered that an integer overflow existed in GRUB2 when handling the initrd command, leading to a heap-based buffer overflow. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-15707)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
grub-efi-amd64-bin - 2.04-1ubuntu26.1
grub-efi-amd64-signed - 1.142.3+2.04-1ubuntu26.1
grub-efi-arm-bin - 2.04-1ubuntu26.1
grub-efi-arm64-bin - 2.04-1ubuntu26.1
grub-efi-arm64-signed - 1.142.3+2.04-1ubuntu26.1
grub-efi-ia32-bin - 2.04-1ubuntu26.1
Ubuntu 18.04 LTS
grub-efi-amd64-bin - 2.02-2ubuntu8.16
grub-efi-amd64-signed - 1.93.18+2.02-2ubuntu8.16
grub-efi-arm-bin - 2.02-2ubuntu8.16
grub-efi-arm64-bin - 2.02-2ubuntu8.16
grub-efi-arm64-signed - 1.93.18+2.02-2ubuntu8.16
grub-efi-ia32-bin - 2.02-2ubuntu8.16
grub-efi-ia64-bin - 2.02-2ubuntu8.16
Ubuntu 16.04 LTS
grub-efi-amd64-bin - 2.02~beta2-36ubuntu3.26
grub-efi-amd64-signed - 1.66.26+2.02~beta2-36ubuntu3.26
grub-efi-arm-bin - 2.02~beta2-36ubuntu3.26
grub-efi-arm64-bin - 2.02~beta2-36ubuntu3.26
grub-efi-arm64-signed - 1.66.26+2.02~beta2-36ubuntu3.26
grub-efi-ia32-bin - 2.02~beta2-36ubuntu3.26
grub-efi-ia64-bin - 2.02~beta2-36ubuntu3.26
Ubuntu 14.04 ESM
grub-efi-amd64-bin - 2.02~beta2-9ubuntu1.20
grub-efi-amd64-signed - 1.34.22+2.02~beta2-9ubuntu1.20
grub-efi-arm-bin - 2.02~beta2-9ubuntu1.20
grub-efi-arm64-bin - 2.02~beta2-9ubuntu1.20
grub-efi-ia32-bin - 2.02~beta2-9ubuntu1.20
grub-efi-ia64-bin - 2.02~beta2-9ubuntu1.20

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Fully mitigating these vulnerabilities requires both an updated GRUB2 boot loader and the application of a UEFI Revocation List (dbx) to system firmware. Ubuntu will provide a packaged dbx update at a later time, though system adminstrators may choose to apply a third party dbx update before then. For more details on mitigation steps and the risks entailed (especially for dual/multi-boot scenarios), please see the Knowledge Base article at https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass

References

USN-4443-1: Firefox vulnerabilities

6 days 6 hours ago
firefox vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

Firefox could be made to crash or run programs as your login if it opened a malicious website.

Software Description
  • firefox - Mozilla Open Source web browser
Details

Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, bypass iframe sandbox restrictions, confuse the user, or execute arbitrary code. (CVE-2020-6463, CVE-2020-6514, CVE-2020-15652, CVE-2020-15653, CVE-2020-15654, CVE-2020-15656, CVE-2020-15658, CVE-2020-15659)

It was discovered that redirected HTTP requests which are observed or modified through a web extension could bypass existing CORS checks. If a user were tricked in to installing a specially crafted extension, an attacker could potentially exploit this to obtain sensitive information across origins. (CVE-2020-15655)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
firefox - 79.0+build1-0ubuntu0.20.04.1
Ubuntu 18.04 LTS
firefox - 79.0+build1-0ubuntu0.18.04.1
Ubuntu 16.04 LTS
firefox - 79.0+build1-0ubuntu0.16.04.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart Firefox to make all the necessary changes.

References

USN-4436-2: librsvg regression

6 days 10 hours ago
librsvg regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

USN-4436-1 introduced a regression in librsvg.

Software Description
  • librsvg - renderer library for SVG files
Details

USN-4436-1 fixed a vulnerability in librsvg. The upstream fix caused a regression when parsing certain SVG files. This update backs out the fix pending further investigation.

Original advisory details:

It was discovered that librsvg incorrectly handled parsing certain SVG files. A remote attacker could possibly use this issue to cause librsvg to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-11464)

It was discovered that librsvg incorrectly handled parsing certain SVG files with nested patterns. A remote attacker could possibly use this issue to cause librsvg to consume resources and crash, resulting in a denial of service. (CVE-2019-20446)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
librsvg2-2 - 2.40.20-2ubuntu0.2
Ubuntu 16.04 LTS
librsvg2-2 - 2.40.13-3ubuntu0.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart your session to make all the necessary changes.

References

USN-4442-1: Sympa vulnerabilities

1 week ago
sympa vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 14.04 ESM
Summary

Several security issues were fixed in Sympa.

Software Description
  • sympa - Modern mailing list manager
Details

Michael Kaczmarczik discovered that Sympa incorrectly handled HTTP GET/POST requests. An attacker could possibly use this issue to insert, edit or obtain sensitive information. (CVE-2018-1000550)

It was discovered that Sympa incorrectly handled URL parameters. An attacker could possibly use this issue to perform XSS attacks. (CVE-2018-1000671)

Nicolas Chatelain discovered that Sympa incorrectly handled environment variables. An attacker could possibly use this issue with a setuid binary and gain root privileges. (CVE-2020-10936)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.04 ESM
sympa - 6.1.17~dfsg-1ubuntu0.1~esm1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

USN-4441-1: MySQL vulnerabilities

1 week ago
mysql-5.7, mysql-8.0 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

Several security issues were fixed in MySQL.

Software Description
  • mysql-8.0 - MySQL database
  • mysql-5.7 - MySQL database
Details

Multiple security issues were discovered in MySQL and this update includes new upstream MySQL versions to fix these issues.

MySQL has been updated to 8.0.21 in Ubuntu 20.04 LTS. Ubuntu 16.04 LTS and Ubuntu 18.04 LTS have been updated to MySQL 5.7.31.

In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes.

Please see the following for more information:

https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-31.html

https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-21.html

https://www.oracle.com/security-alerts/cpujul2020.html

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
mysql-server-8.0 - 8.0.21-0ubuntu0.20.04.3
Ubuntu 18.04 LTS
mysql-server-5.7 - 5.7.31-0ubuntu0.18.04.1
Ubuntu 16.04 LTS
mysql-server-5.7 - 5.7.31-0ubuntu0.16.04.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

This update uses a new upstream release, which includes additional bug fixes. In general, a standard system update will make all the necessary changes.

References

USN-4427-1: Linux kernel vulnerabilities

1 week ago
linux, linux-aws, linux-kvm, linux-lts-xenial, linux-raspi2, linux-snapdragon vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM
Summary

Several security issues were fixed in the Linux kernel.

Software Description
  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi (V7) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
Details

It was discovered that the Kvaser CAN/USB driver in the Linux kernel did not properly initialize memory in certain situations. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2019-19947)

Chuhong Yuan discovered that go7007 USB audio device driver in the Linux kernel did not properly deallocate memory in some failure conditions. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-20810)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading SSDT code from an EFI variable. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)

It was discovered that the elf handling code in the Linux kernel did not initialize memory before using it in certain situations. A local attacker could use this to possibly expose sensitive information (kernel memory). (CVE-2020-10732)

It was discovered that the Linux kernel did not correctly apply Speculative Store Bypass Disable (SSBD) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10766)

It was discovered that the Linux kernel did not correctly apply Indirect Branch Predictor Barrier (IBPB) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10767)

It was discovered that the Linux kernel could incorrectly enable indirect branch speculation after it has been disabled for a process via a prctl() call. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10768)

Mauricio Faria de Oliveira discovered that the aufs implementation in the Linux kernel improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service. (CVE-2020-11935)

It was discovered that the Virtual Terminal keyboard driver in the Linux kernel contained an integer overflow. A local attacker could possibly use this to have an unspecified impact. (CVE-2020-13974)

It was discovered that the efi subsystem in the Linux kernel did not handle memory allocation failures during early boot in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-12380)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04 LTS
linux-image-4.4.0-1077-kvm - 4.4.0-1077.84
linux-image-4.4.0-1111-aws - 4.4.0-1111.123
linux-image-4.4.0-1136-raspi2 - 4.4.0-1136.145
linux-image-4.4.0-1140-snapdragon - 4.4.0-1140.148
linux-image-4.4.0-186-generic - 4.4.0-186.216
linux-image-4.4.0-186-generic-lpae - 4.4.0-186.216
linux-image-4.4.0-186-lowlatency - 4.4.0-186.216
linux-image-4.4.0-186-powerpc-e500mc - 4.4.0-186.216
linux-image-4.4.0-186-powerpc-smp - 4.4.0-186.216
linux-image-4.4.0-186-powerpc64-emb - 4.4.0-186.216
linux-image-4.4.0-186-powerpc64-smp - 4.4.0-186.216
linux-image-aws - 4.4.0.1111.116
linux-image-generic - 4.4.0.186.192
linux-image-generic-lpae - 4.4.0.186.192
linux-image-kvm - 4.4.0.1077.75
linux-image-lowlatency - 4.4.0.186.192
linux-image-powerpc-e500mc - 4.4.0.186.192
linux-image-powerpc-smp - 4.4.0.186.192
linux-image-powerpc64-emb - 4.4.0.186.192
linux-image-powerpc64-smp - 4.4.0.186.192
linux-image-raspi2 - 4.4.0.1136.136
linux-image-snapdragon - 4.4.0.1140.132
linux-image-virtual - 4.4.0.186.192
Ubuntu 14.04 ESM
linux-image-4.4.0-1075-aws - 4.4.0-1075.79
linux-image-4.4.0-186-generic - 4.4.0-186.216~14.04.1
linux-image-4.4.0-186-generic-lpae - 4.4.0-186.216~14.04.1
linux-image-4.4.0-186-lowlatency - 4.4.0-186.216~14.04.1
linux-image-4.4.0-186-powerpc-e500mc - 4.4.0-186.216~14.04.1
linux-image-4.4.0-186-powerpc-smp - 4.4.0-186.216~14.04.1
linux-image-4.4.0-186-powerpc64-emb - 4.4.0-186.216~14.04.1
linux-image-4.4.0-186-powerpc64-smp - 4.4.0-186.216~14.04.1
linux-image-aws - 4.4.0.1075.72
linux-image-generic-lpae-lts-xenial - 4.4.0.186.163
linux-image-generic-lts-xenial - 4.4.0.186.163
linux-image-lowlatency-lts-xenial - 4.4.0.186.163
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.186.163
linux-image-powerpc-smp-lts-xenial - 4.4.0.186.163
linux-image-powerpc64-emb-lts-xenial - 4.4.0.186.163
linux-image-powerpc64-smp-lts-xenial - 4.4.0.186.163
linux-image-virtual-lts-xenial - 4.4.0.186.163

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References

USN-4426-1: Linux kernel vulnerabilities

1 week 1 day ago
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary

Several security issues were fixed in the Linux kernel.

Software Description
  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM systems
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi (V7) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
Details

Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading SSDT code from an EFI variable. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)

Fan Yang discovered that the mremap implementation in the Linux kernel did not properly handle DAX Huge Pages. A local attacker with access to DAX storage could use this to gain administrative privileges. (CVE-2020-10757)

Mauricio Faria de Oliveira discovered that the aufs implementation in the Linux kernel improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service. (CVE-2020-11935)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading ACPI tables via configfs. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
linux-image-4.15.0-1050-oracle - 4.15.0-1050.54
linux-image-4.15.0-1066-gke - 4.15.0-1066.69
linux-image-4.15.0-1067-raspi2 - 4.15.0-1067.71
linux-image-4.15.0-1071-kvm - 4.15.0-1071.72
linux-image-4.15.0-1079-aws - 4.15.0-1079.83
linux-image-4.15.0-1080-gcp - 4.15.0-1080.90
linux-image-4.15.0-1083-snapdragon - 4.15.0-1083.91
linux-image-4.15.0-1092-azure - 4.15.0-1092.102
linux-image-4.15.0-1093-oem - 4.15.0-1093.103
linux-image-4.15.0-112-generic - 4.15.0-112.113
linux-image-4.15.0-112-generic-lpae - 4.15.0-112.113
linux-image-4.15.0-112-lowlatency - 4.15.0-112.113
linux-image-aws-lts-18.04 - 4.15.0.1079.81
linux-image-azure-lts-18.04 - 4.15.0.1092.63
linux-image-gcp-lts-18.04 - 4.15.0.1080.96
linux-image-generic - 4.15.0.112.100
linux-image-generic-lpae - 4.15.0.112.100
linux-image-gke - 4.15.0.1066.68
linux-image-gke-4.15 - 4.15.0.1066.68
linux-image-kvm - 4.15.0.1071.67
linux-image-lowlatency - 4.15.0.112.100
linux-image-oem - 4.15.0.1093.96
linux-image-oracle-lts-18.04 - 4.15.0.1050.59
linux-image-powerpc-e500mc - 4.15.0.112.100
linux-image-powerpc-smp - 4.15.0.112.100
linux-image-powerpc64-emb - 4.15.0.112.100
linux-image-powerpc64-smp - 4.15.0.112.100
linux-image-raspi2 - 4.15.0.1067.65
linux-image-snapdragon - 4.15.0.1083.86
linux-image-virtual - 4.15.0.112.100
Ubuntu 16.04 LTS
linux-image-4.15.0-1050-oracle - 4.15.0-1050.54~16.04.1
linux-image-4.15.0-1079-aws - 4.15.0-1079.83~16.04.1
linux-image-4.15.0-1080-gcp - 4.15.0-1080.90~16.04.1
linux-image-4.15.0-1092-azure - 4.15.0-1092.102~16.04.1
linux-image-4.15.0-112-generic - 4.15.0-112.113~16.04.1
linux-image-4.15.0-112-generic-lpae - 4.15.0-112.113~16.04.1
linux-image-4.15.0-112-lowlatency - 4.15.0-112.113~16.04.1
linux-image-aws-hwe - 4.15.0.1079.76
linux-image-azure - 4.15.0.1092.87
linux-image-gcp - 4.15.0.1080.82
linux-image-generic-hwe-16.04 - 4.15.0.112.114
linux-image-generic-lpae-hwe-16.04 - 4.15.0.112.114
linux-image-gke - 4.15.0.1080.82
linux-image-lowlatency-hwe-16.04 - 4.15.0.112.114
linux-image-oem - 4.15.0.112.114
linux-image-oracle - 4.15.0.1050.41
linux-image-virtual-hwe-16.04 - 4.15.0.112.114

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References

USN-4439-1: Linux kernel vulnerabilities

1 week 1 day ago
linux-gke-5.0, linux-oem-osp1 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS
Summary

Several security issues were fixed in the Linux kernel.

Software Description
  • linux-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems
  • linux-oem-osp1 - Linux kernel for OEM systems
Details

It was discovered that the network block device (nbd) implementation in the Linux kernel did not properly check for error conditions in some situations. An attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-16089)

It was discovered that the btrfs file system implementation in the Linux kernel did not properly validate file system metadata in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2019-19036)

It was discovered that the kernel->user space relay implementation in the Linux kernel did not properly check return values in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-19462)

Chuhong Yuan discovered that go7007 USB audio device driver in the Linux kernel did not properly deallocate memory in some failure conditions. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-20810)

It was discovered that the elf handling code in the Linux kernel did not initialize memory before using it in certain situations. A local attacker could use this to possibly expose sensitive information (kernel memory). (CVE-2020-10732)

Fan Yang discovered that the mremap implementation in the Linux kernel did not properly handle DAX Huge Pages. A local attacker with access to DAX storage could use this to gain administrative privileges. (CVE-2020-10757)

It was discovered that the Linux kernel did not correctly apply Speculative Store Bypass Disable (SSBD) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10766)

It was discovered that the Linux kernel did not correctly apply Indirect Branch Predictor Barrier (IBPB) mitigations in certain situations. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10767)

It was discovered that the Linux kernel could incorrectly enable indirect branch speculation after it has been disabled for a process via a prctl() call. A local attacker could possibly use this to expose sensitive information. (CVE-2020-10768)

Mauricio Faria de Oliveira discovered that the aufs implementation in the Linux kernel improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service. (CVE-2020-11935)

It was discovered that the Virtual Terminal keyboard driver in the Linux kernel contained an integer overflow. A local attacker could possibly use this to have an unspecified impact. (CVE-2020-13974)

It was discovered that the efi subsystem in the Linux kernel did not handle memory allocation failures during early boot in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-12380)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading SSDT code from an EFI variable. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux kernel did not properly restrict loading ACPI tables via configfs. A privileged attacker could use this to bypass Secure Boot lockdown restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
linux-image-5.0.0-1045-gke - 5.0.0-1045.46
linux-image-5.0.0-1065-oem-osp1 - 5.0.0-1065.70
linux-image-gke-5.0 - 5.0.0.1045.30
linux-image-oem-osp1 - 5.0.0.1065.63

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References
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35 minutes 14 seconds ago