Exploit/Advisories

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Ubuntu Security Notice USN-4393-1
June 10, 2020

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

- Ubuntu 12.04 ESM

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)

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://usn.ubuntu.com/4393-1
CVE-2020-0543, CVE-2020-12654,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SRBDS

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