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Ubuntu 20.04 LTS USN-5474-2: Varnish Cache Restart Due To Crafted Input

ubuntu
Calendar Grey August 24, 2022
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-5474-3 addresses a restart problem with Varnish Cache due to manipulated input impacting Ubuntu 22.04 LTS.
Varnish Cache could be made to restart if it received specially crafted input.

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)

Topics%20covered

Topics Covered

security advisory Ubuntu remote attacks varnish restart issue crafted input

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-5474-1

CVE-2020-11653

Severity
important
Lowest
Low
Medium
High
Critical

August 23, 2022

Topics%20covered

Topics Covered

security advisory Ubuntu remote attacks varnish restart issue crafted input

Package Information

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

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