Home/CVE/Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable
CVE

CVE-2024-23638

Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable

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.

MEDIUM · CVSS 6.5 EPSS 0.12145
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 6% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-672Operation on a Resource after Expiration or Release
CWE-825Expired Pointer Dereference
▤

Affected Products & Versions

2
squid-cache squid>= 5.0 and <= 5.9
squid-cache squid>= 6.0 and < 6.6
⚠

Public Exploits & PoCs

1
pocmegamansec.github.io · stream-assert.htmlmegamansec.github.io
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Jan 2024 · 12:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

7
rhsaRHSA-2024:9644Important
rhsaRHSA-2024:4861Moderate
suse-csafopenSUSE-SU-2024:13631-1
usnUSN-6728-1
suse-csafSUSE-SU-2024:0455-1
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patchMailing ListPatch
http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patchMailing ListPatch
https://github.com/squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382bPatch
https://github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8Patch
https://github.com/squid-cache/squid/security/advisories/GHSA-j49p-553x-48rxVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7R4KPSO3MQT3KAOZV7LC2GG3CYMCGK7H/
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