CVE-2024-23638

Publication date 24 January 2024

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable to a Denial of Service attack against Cache Manager error responses. This problem allows a trusted client to perform Denial of Service when generating error pages for Client Manager reports. Squid older than 5.0.5 have not been tested and should be assumed to be vulnerable. All Squid-5.x up to and including 5.9 are vulnerable. All Squid-6.x up to and including 6.5 are vulnerable. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. As a workaround, prevent access to Cache Manager using Squid's main access control: `http_access deny manager`.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
squid	24.10 oracular	Fixed 6.6-1ubuntu1
	24.04 LTS noble	Fixed 6.6-1ubuntu1
	23.10 mantic	Fixed 6.1-2ubuntu1.3
	23.04 lunar	Ignored end of life, was needs-triage
	22.04 LTS jammy	Fixed 5.7-0ubuntu0.22.04.4
	20.04 LTS focal	Fixed 4.10-1ubuntu1.10
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
squid3	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Ignored end of standard support

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
squid	Upstream: 290ae20 Upstream: 61c9e76 Upstream: http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patch Upstream: http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patch

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-6728-1
Squid vulnerabilities
10 April 2024