ESB-2018.3583 - [Ubuntu] kernel: Access privileged data - Existing account 2018-11-16

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3583
                       Linux kernel vulnerabilities
                             16 November 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-3646 CVE-2018-3620 

Reference:         ASB-2018.0204
                   ESB-2018.2665
                   ESB-2018.2612
                   ESB-2018.2561
                   ESB-2018.2534

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3823-1

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USN-3823-1: Linux kernel vulnerabilities

15 November 2018

linux vulnerabilities

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

  o Ubuntu 12.04 ESM

Summary

Several security issues were mitigated in the Linux kernel.

Software Description

  o linux - Linux kernel

Details

It was discovered that memory present in the L1 data cache of an Intel CPU core
may be exposed to a malicious process that is executing on the CPU core. This
vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a
guest virtual machine could use this to expose sensitive information (memory
from other guests or the host OS). (CVE-2018-3646)

It was discovered that memory present in the L1 data cache of an Intel CPU core
may be exposed to a malicious process that is executing on the CPU core. This
vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could
use this to expose sensitive information (memory from the kernel or other
processes). (CVE-2018-3620)

Update instructions

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

Ubuntu 12.04 ESM
    linux-image-3.2.0-137-generic - 3.2.0-137.183
    linux-image-3.2.0-137-generic-pae - 3.2.0-137.183
    linux-image-3.2.0-137-highbank - 3.2.0-137.183
    linux-image-3.2.0-137-omap - 3.2.0-137.183
    linux-image-3.2.0-137-powerpc-smp - 3.2.0-137.183
    linux-image-3.2.0-137-powerpc64-smp - 3.2.0-137.183
    linux-image-3.2.0-137-virtual - 3.2.0-137.183
    linux-image-generic - 3.2.0.137.152
    linux-image-generic-pae - 3.2.0.137.152
    linux-image-highbank - 3.2.0.137.152
    linux-image-omap - 3.2.0.137.152
    linux-image-powerpc - 3.2.0.137.152
    linux-image-powerpc-smp - 3.2.0.137.152
    linux-image-powerpc64-smp - 3.2.0.137.152
    linux-image-virtual - 3.2.0.137.152

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

Please note that the recommended mitigation for CVE-2018-3646 involves updating
processor microcode in addition to updating the kernel; however, the kernel
includes a fallback for processors that have not received microcode updates.

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

  o CVE-2018-3620
  o CVE-2018-3646
  o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF

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