CVE-2022-41318 — A buffer over-read was discovered in libntlmauth in Squid 2
A buffer over-read was discovered in libntlmauth in Squid 2.5 through 5.6. Due to incorrect integer-overflow protection, the SSPI and SMB authentication helpers are vulnerable to reading unintended memory locations. In some configurations, cleartext credentials from these locatio
Published
2022-12-25T00:00:00.000Z
Last modified
2025-04-14T18:33:53.348Z
01What is this vulnerability?
A buffer over-read was discovered in libntlmauth in Squid 2.5 through 5.6. Due to incorrect integer-overflow protection, the SSPI and SMB authentication helpers are vulnerable to reading unintended memory locations. In some configurations, cleartext credentials from these locations are sent to a client. This is fixed in 5.7.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2022-12-25T00:00:00.000Z
- Last modified: 2025-04-14T18:33:53.348Z
09References
- github.com — https://github.com/squid-cache/squid/security/advisories/GHSA-394c-rr7q-6g78
- www.squid-cache.org — http://www.squid-cache.org/Versions/v4/changesets/SQUID-2022_2.patch
- www.squid-cache.org — http://www.squid-cache.org/Versions/v5/changesets/SQUID-2022_2.patch
- www.openwall.com — https://www.openwall.com/lists/oss-security/2022/09/23/2
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