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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
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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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