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Ubuntu 12.04 ESM: USN-4393-1 Critical: Linux Kernel Buffer Overflow

ubuntu
Calendar Grey June 9, 2020
Dist Ubuntu Esm H88
Ubuntu Security Update USN-4394-1 addresses severe kernel flaws impacting Ubuntu 18.04 environments.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

Details:

It was discovered that the Marvell WiFi-Ex Driver in the Linux kernel did

not properly validate status lengths in messages received from an access

point, leading to a buffer overflow. A physically proximate attacker

controlling an access point could use this to construct messages that could

possibly result in arbitrary code execution. (CVE-2020-12654)

It was discovered that memory contents previously stored in

microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY

read operations on Intel client and Xeon E3 processors may be briefly

exposed to processes on the same or different processor cores. A local

attacker could use this to expose sensitive information. (CVE-2020-0543)

Topics%20covered

Topics Covered

security advisory update buffer overflow critical Ubuntu kernel information disclosure

Update Instructions

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

Ubuntu 12.04 ESM:
  linux-image-3.2.0-147-generic   3.2.0-147.194
  linux-image-3.2.0-147-generic-pae  3.2.0-147.194
  linux-image-3.2.0-147-highbank  3.2.0-147.194
  linux-image-3.2.0-147-powerpc-smp  3.2.0-147.194
  linux-image-3.2.0-147-powerpc64-smp  3.2.0-147.194
  linux-image-3.2.0-147-virtual   3.2.0-147.194
  linux-image-generic             3.2.0.147.161
  linux-image-generic-pae         3.2.0.147.161
  linux-image-highbank            3.2.0.147.161
  linux-image-powerpc             3.2.0.147.161
  linux-image-powerpc-smp         3.2.0.147.161
  linux-image-powerpc64-smp       3.2.0.147.161
  linux-image-server              3.2.0.147.161
  linux-image-virtual             3.2.0.147.161

Please note that the mitigation for CVE-2020-0543 requires a processor
microcode update to be applied, either from your system manufacturer
or via the intel-microcode package. The kernel update for this issue
provides the ability to disable the mitigation and to report
vulnerability status.

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

https://ubuntu.com/security/notices/USN-4393-1

CVE-2020-0543, CVE-2020-12654,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SRBDS

Severity
critical
Lowest
Low
Medium
High
Critical

June 10, 2020

Topics%20covered

Topics Covered

security advisory update buffer overflow critical Ubuntu kernel information disclosure

Package Information

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