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USN-5474-2: Varnish Cache regression

23 August 2022

Varnish Cache could be made to restart if it received specially crafted input.

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Releases

Packages

  • varnish - state of the art, high-performance web accelerator

Details

USN-5474-1 fixed vulnerabilities in Varnish Cache. Unfortunately the fix for
CVE-2020-11653 was incomplete. This update fixes the problem.

Original advisory details:

It was discovered that Varnish Cache could have an assertion failure when a
TLS termination proxy uses PROXY version 2. A remote attacker could possibly
use this issue to restart the daemon and cause a performance loss.
(CVE-2020-11653)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 20.04

In general, a standard system update will make all the necessary changes.

References

Related notices

  • USN-5474-1: varnish, varnish-doc, libvarnishapi-dev, libvarnishapi1, libvarnishapi2

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Further reading