CVE-2004-0189

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 13.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2004-03-15 · updated 2026-06-16

Description

The "%xx" URL decoding function in Squid 2.5STABLE4 and earlier allows remote attackers to bypass url_regex ACLs via a URL with a NULL ("%00") character, which causes Squid to use only a portion of the requested URL when comparing it against the access control lists.

Affected products

Squid: 2.0_patch2, 2.1_patch2, 2.3_stable5, 2.4, 2.4_stable7, 2.5_stable3 (+1)

References

http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000838
http://marc.info/?l=bugtraq&m=108084935904110&w=2
http://security.gentoo.org/glsa/glsa-200403-11.xml
http://www.debian.org/security/2004/dsa-474
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2004:025
http://www.osvdb.org/5916
http://www.redhat.com/support/errata/RHSA-2004-133.html
http://www.redhat.com/support/errata/RHSA-2004-134.html
http://www.securityfocus.com/bid/9778
http://www.squid-cache.org/Advisories/SQUID-2004_1.txt

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