[USN-6728-2] Squid regression

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==========================================================================
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