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Ubuntu Security Notice USN-5474-2

Ubuntu Security Notice USN-5474-2
Posted Aug 25, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5474-2 - USN-5474-1 fixed vulnerabilities in Varnish Cache. Unfortunately the fix for CVE-2020-11653 was incomplete. This update fixes the problem. 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.

tags | advisory, remote, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-11653
SHA-256 | 9f42bd8d47eeef57534724a225acf2e6270a8437cec9bc39c2b61610b5595336

Ubuntu Security Notice USN-5474-2

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-5474-2
August 23, 2022

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

- Ubuntu 20.04 LTS

Summary:

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

Software Description:
- 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)

Update instructions:

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

Ubuntu 20.04 LTS:
libvarnishapi2 6.2.1-2ubuntu0.2
varnish 6.2.1-2ubuntu0.2

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

References:
https://ubuntu.com/security/notices/USN-5474-2
https://ubuntu.com/security/notices/USN-5474-1
CVE-2020-11653

Package Information:
https://launchpad.net/ubuntu/+source/varnish/6.2.1-2ubuntu0.2
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