Description
Multiple buffer overflows in squidGuard 1.4 allow remote attackers to bypass intended URL blocking via a long URL, related to (1) the relationship between a certain buffer size in squidGuard and a certain buffer size in Squid and (2) a redirect URL that contains information about the originally requested URL.
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 13 | squidguard | 1.2.0-9 | — |
| Debian 12 | squidguard | 1.2.0-9 | — |
| Debian 5.0 | squidguard | 1.2.0-8.4+lenny1 | DSA-2040-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squidGuard | 1.4-27.7 | openSUSE-SU-2024:10562-1 |
Advisories 2
- DSA-2040-1 squidguard - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10562-1 squidGuard-1.4-27.7 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www.squidguard.org/Downloads/Patches/1.4/Readme.Patch-20091019
- squidguard-url-security-bypass(53922) vdb-entry
- ADV-2009-3013 vdb-entry
- 1023079 vdb-entry
- 37107 third-party-advisory
- ADV-2010-1043 vdb-entry
- 59164 vdb-entry
- DSA-2040 vendor-advisory
- SUSE-SR:2010:014 vendor-advisory
- 36800 vdb-entry
- 39679 third-party-advisory
- 20091026 squidGuard 1.3 & 1.4 : buffer overflow mailing-list