Description
The WCCP message parsing code in Squid 2.5.STABLE7 and earlier allows remote attackers to cause a denial of service (crash) via malformed WCCP messages with source addresses that are spoofed to reference Squid's home router and invalid WCCP_I_SEE_YOU cache numbers.
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 | 2.5.7-4 | — |
| Debian 13 | squid | 2.5.7-4 | — |
| Debian 12 | squid | 2.5.7-4 | — |
| Debian 3.0 | squid | 2.4.6-2woody5 | DSA-651-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | squid | 7:2.5.STABLE6-3.4E.3 | RHSA-2005:060 |
| RHEL 3 | squid | 7:2.5.STABLE3-6.3E.7 | RHSA-2005:061 |
Advisories 3
- RHSA-2005:060 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2005:061 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-651-1 squid - buffer overflow, integer overflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- CLA-2005:923 vendor-advisory
- 2005-0003 vendor-advisory
- 12275 vdb-entry
- 12886 vdb-entry
- FLSA-2006:152809 vendor-advisory
- GLSA-200501-25 vendor-advisory
- DSA-651 vendor-advisory
- http://www.squid-cache.org/Versions/v2/2.5/bugs/squid-2.5.STABLE7-wccp_denial_of_service.patch
- oval:org.mitre.oval:def:10269 vdb-entry signature
- http://www.squid-cache.org/Advisories/SQUID-2005_2.txt
- 1012882 vdb-entry
- RHSA-2005:061 vendor-advisory
- MDKSA-2005:014 vendor-advisory
- SUSE-SA:2005:006 vendor-advisory
- RHSA-2005:060 vendor-advisory
- 13825 third-party-advisory