Description

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`.

Classification

CVE ID: CVE-2024-23638

CVSS Base Severity: MEDIUM

CVSS Base Score: 6.5

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor: squid-cache

Product: squid

Exploit Prediction Scoring System (EPSS)

EPSS Score: 1.78% (probability of being exploited)

EPSS Percentile: 88.09% (scored less or equal to compared to others)

EPSS Date: 2025-03-14 (when was this score calculated)

References

https://github.com/squid-cache/squid/security/advisories/GHSA-j49p-553x-48rx
https://github.com/squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382b
https://github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8
https://megamansec.github.io/Squid-Security-Audit/stream-assert.html
http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patch
http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patch
https://security.netapp.com/advisory/ntap-20240208-0010/
https://lists.fedoraproject.org/archives/list/[email protected]/message/7R4KPSO3MQT3KAOZV7LC2GG3CYMCGK7H/
https://lists.fedoraproject.org/archives/list/[email protected]/message/XWQHRDRHDM5PQTU6BHH4C5KGL37X6TVI/

Timeline