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GLSA-200403-11 : Squid ACL [url_regex] bypass vulnerability

high Nessus Plugin ID 14462

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-200403-11 (Squid ACL [url_regex] bypass vulnerability)

 A bug in Squid allows users to bypass certain access controls by passing a URL containing '%00' which exploits the Squid decoding function.
 This may insert a NUL character into decoded URLs, which may allow users to bypass url_regex access control lists that are enforced upon them.
 In such a scenario, Squid will insert a NUL character after the'%00' and it will make a comparison between the URL to the end of the NUL character rather than the contents after it: the comparison does not result in a match, and the user's request is not denied.
 Impact :

 Restricted users may be able to bypass url_regex access control lists that are enforced upon them which may cause unwanted network traffic as well as a route for other possible exploits. Users of Squid 2.5STABLE4 and below who require the url_regex features are recommended to upgrade to 2.5STABLE5 to maintain the security of their infrastructure.
 Workaround :

 A workaround is not currently known for this issue. All users are advised to upgrade to the latest version of Squid.

Solution

Squid can be updated as follows:
 # emerge sync # emerge -pv '>=net-proxy/squid-2.5.5' # emerge '>=net-proxy/squid-2.5.5'

See Also

http://www.squid-cache.org/Advisories/SQUID-2004_1.txt

https://security.gentoo.org/glsa/200403-11

Plugin Details

Severity: High

ID: 14462

File Name: gentoo_GLSA-200403-11.nasl

Version: 1.14

Type: local

Published: 8/30/2004

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.1

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:squid, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Patch Publication Date: 3/30/2004

Reference Information

CVE: CVE-2004-0189

GLSA: 200403-11