CVE-2024-23638

MEDIUM EPSS 99.0%
Published Jan 24, 20242y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Jan 24, 2024 2y ago
Last Modified Jun 17, 2026 2w ago

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`.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
99.0% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-672
CWE-825

Affected Products 2

VendorProductVersionRange
squid-cachesquid*≥5.0  –  ≤5.9
squid-cachesquid*≥6.0  –  <6.6

References 9

  • squid-cache.org http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patch
    Mailing ListPatch
  • squid-cache.org http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patch
    Mailing ListPatch
  • github.com https://github.com/squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382b
    Patch
  • github.com https://github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8
    Patch
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-j49p-553x-48rx
    Vendor Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7R4KPSO3MQT3KAOZV7LC2GG3CYMCGK7H/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XWQHRDRHDM5PQTU6BHH4C5KGL37X6TVI/
  • megamansec.github.io https://megamansec.github.io/Squid-Security-Audit/stream-assert.html
    Exploit
  • security.netapp.com https://security.netapp.com/advisory/ntap-20240208-0010/

Remediation

  • squid-cache.org http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patch
    Mailing ListPatch
  • squid-cache.org http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patch
    Mailing ListPatch
  • github.com https://github.com/squid-cache/squid/commit/290ae202883ac28a48867079c2fb34c40efd382b
    Patch
  • github.com https://github.com/squid-cache/squid/commit/e8118a7381213f5cfcdeb4cec1d2d854bfd261c8
    Patch