==========================================================================
Ubuntu Security Notice USN-6728-2
April 11, 2024

squid regression
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

USN-6728-1 introduced a regression in Squid.

Software Description:
- squid: Web proxy cache server

Details:

USN-6728-1 fixed vulnerabilities in Squid. The fix for CVE-2023-5824 caused
Squid to crash in certain environments on Ubuntu 20.04 LTS. The problematic
fix has been reverted pending further investigation.

We apologize for the inconvenience.

Original advisory details:

  Joshua Rogers discovered that Squid incorrectly handled collapsed
  forwarding. A remote attacker could possibly use this issue to cause Squid
  to crash, resulting in a denial of service. This issue only affected Ubuntu
  20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-49288)
   Joshua Rogers discovered that Squid incorrectly handled certain structural
  elements. A remote attacker could possibly use this issue to cause Squid to
  crash, resulting in a denial of service. (CVE-2023-5824)
   Joshua Rogers discovered that Squid incorrectly handled Cache Manager error
  responses. A remote trusted client can possibly use this issue to cause
  Squid to crash, resulting in a denial of service. (CVE-2024-23638)
   Joshua Rogers discovered that Squid incorrectly handled the HTTP Chunked
  decoder. A remote attacker could possibly use this issue to cause Squid to
  stop responding, resulting in a denial of service. (CVE-2024-25111)
   Joshua Rogers discovered that Squid incorrectly handled HTTP header
  parsing. A remote trusted client can possibly use this issue to cause
  Squid to crash, resulting in a denial of service. (CVE-2024-25617)

Update instructions:

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

Ubuntu 20.04 LTS:
   squid                           4.10-1ubuntu1.11

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

References:
   https://ubuntu.com/security/notices/USN-6728-2
   https://ubuntu.com/security/notices/USN-6728-1
   https://launchpad.net/bugs/2060880

Package Information:
   https://launchpad.net/ubuntu/+source/squid/4.10-1ubuntu1.11