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Ubuntu 14.04 LTS: 3594-1 Critical: Linux Kernel Information Leak

ubuntu
Calendar Grey March 9, 2018
Scroller Ubuntu
Revise your Ubuntu installation to mitigate a significant kernel flaw that could reveal confidential information, identified in March 2018.
The system could be made to expose sensitive information.

Summary

The system could be made to expose sensitive information.

Software Description:

- linux: Linux kernel

Details:

USN-3542-1 mitigated CVE-2017-5715 (Spectre Variant 2) for the

amd64 architecture in Ubuntu 14.04 LTS. This update provides the

compiler-based retpoline kernel mitigation for the amd64 and i386

architectures. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative execution

and branch prediction may allow unauthorized memory reads via sidechannel

attacks. This flaw is known as Spectre. A local attacker could use this to

expose sensitive information, including kernel memory. (CVE-2017-5715)

Topics%20covered

Topics Covered

security advisory critical system update information exposure ubuntu linux kernel speculative execution

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-143-generic  3.13.0-143.192
  linux-image-3.13.0-143-generic-lpae  3.13.0-143.192
  linux-image-3.13.0-143-lowlatency  3.13.0-143.192
  linux-image-generic             3.13.0.143.153
  linux-image-generic-lpae        3.13.0.143.153
  linux-image-lowlatency          3.13.0.143.153

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-3594-1

CVE-2017-5715, https://ubuntu.com/security/notices/USN-3542-1

Severity
critical
Lowest
Low
Medium
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Critical

March 09, 2018

Topics%20covered

Topics Covered

security advisory critical system update information exposure ubuntu linux kernel speculative execution

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-143.192

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