Explore top 10 tips to secure your open-source projects now. Read More

×
Alerts This Week
Warning Icon 1 555
Alerts This Week
Warning Icon 1 555

Ubuntu 12.04 ESM USN-3823-1 Moderate: Kernel Memory Exposure Threat

ubuntu
Calendar Grey November 15, 2018
Dist Ubuntu Esm H88
Addressed vulnerabilities within the Linux kernel on Ubuntu have implications for critical data leaks, potentially paving the way for exploitation.
Several security issues were mitigated in the Linux kernel.

Summary

Several security issues were mitigated in the Linux kernel.

Software Description:

- 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)

Topics%20covered

Topics Covered

security advisory Ubuntu moderate severity kernel memory exposure L1TF malicious process

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

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

https://ubuntu.com/security/notices/USN-3823-1

CVE-2018-3620, CVE-2018-3646,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF

November 15, 2018

Topics%20covered

Topics Covered

security advisory Ubuntu moderate severity kernel memory exposure L1TF malicious process

Package Information

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.