Description
The (1) ntlm_fetch_string and (2) ntlm_get_string functions in Squid 2.5.6 and earlier, with NTLM authentication enabled, allow remote attackers to cause a denial of service (application crash) via an NTLMSSP packet that causes a negative value to be passed to memcpy.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | squid | 2.5.6-8 | — |
| Debian 13 | squid | 2.5.6-8 | — |
| Debian 12 | squid | 2.5.6-8 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 3 | squid | 7:2.5.STABLE3-6.3E.1 | RHSA-2004:462 |
Advisories 1
- RHSA-2004:462 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/#squid-2.5.STABLE6-ntlm_fetch_string
- 11098 vdb-entry
- http://www.squid-cache.org/bugs/show_bug.cgi?id=1045
- GLSA-200409-04 vendor-advisory
- FLSA-2006:152809 vendor-advisory
- 2004-0047 vendor-advisory
- oval:org.mitre.oval:def:10489 vdb-entry signature
- squid-ntlmssp-dos(17218) vdb-entry
- MDKSA-2004:093 vendor-advisory