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Vulnerability Details : CVE-2004-0189

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.
Publish Date : 2004-03-15 Last Update Date : 2017-10-10
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID CWE id is not defined for this vulnerability

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat low 2004-02-29
If you are a vendor and you have additional data which can be automatically imported into our database, please contact admin @

- Related OVAL Definitions

Title Definition Id Class Family
Red Hat Enterprise 3 Squid ACL Bypass Vulnerability oval:org.mitre.oval:def:941 unix
Red Hat Squid ACL Bypass Vulnerability oval:org.mitre.oval:def:877 unix
RHSA-2004:133: squid security update (Low) oval:com.redhat.rhsa:def:2004133 unix
RHSA-2004:133: squid security update (Low) oval:com.redhat.rhsa:def:20040133 unix
The "%xx" URL decoding function in Squid 2.5STABLE4 and earlier allows remote attackers to bypass url_regex ACLs via a U... oval:org.mitre.oval:def:11354 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2004-0189

# Product Type Vendor Product Version Update Edition Language
1 Application Squid Squid 2.0 Patch2 * * * Version Details Vulnerabilities
2 Application Squid Squid 2.1 Patch2 * * * Version Details Vulnerabilities
3 Application Squid Squid 2.3 Stable5 * * * Version Details Vulnerabilities
4 Application Squid Squid 2.4 * * * Version Details Vulnerabilities
5 Application Squid Squid 2.4 Stable7 * * * Version Details Vulnerabilities
6 Application Squid Squid 2.5 Stable4 * * * Version Details Vulnerabilities
7 Application Squid Squid 2.5 Stable3 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Squid Squid 7

- References For CVE-2004-0189 CONFIRM
OSVDB 5916
REDHAT RHSA-2004:134
BUGTRAQ 20040401 [OpenPKG-SA-2004.008] OpenPKG Security Advisory (squid)
SCO SCOSA-2005.16
SGI 20040404-01-U
REDHAT RHSA-2004:133
GENTOO GLSA-200403-11
BID 9778 Squid Proxy NULL URL Character Unauthorized Access Vulnerability Release Date:2009-07-12
OVAL oval:org.mitre.oval:def:941
OVAL oval:org.mitre.oval:def:877
XF squid-urlregex-acl-bypass(15366)

- Metasploit Modules Related To CVE-2004-0189

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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