Description
Race condition in Squid 2.5.STABLE7 to 2.5.STABLE9, when using the Netscape Set-Cookie recommendations for handling cookies in caches, may cause Set-Cookie headers to be sent to other users, which allows attackers to steal the related cookies.
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 | 2.5.9-2 | — |
| Debian 13 | squid | 2.5.9-2 | — |
| Debian 12 | squid | 2.5.9-2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | squid | 7:2.5.STABLE6-3.4E.9 | RHSA-2005:415 |
| RHEL 3 | squid | 7:2.5.STABLE3-6.3E.13 | RHSA-2005:415 |
Advisories 1
- RHSA-2005:415 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE9-setcookie
- FLSA-2006:152809 vendor-advisory
- 12716 vdb-entry
- USN-93-1 vendor-advisory
- squid-set-cookie-race-condition(19581) vdb-entry
- oval:org.mitre.oval:def:11169 vdb-entry signature
- RHSA-2005:415 vendor-advisory