Vulnerability Assessment & Network Security Forums



If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200403-11] Squid ACL [url_regex] bypass vulnerability


Vulnerability Assessment Details

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

Vulnerability Assessment Summary
Squid ACL [url_regex] bypass vulnerability

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200403-11
(Squid ACL [url_regex] bypass vulnerability)


A bug in Squid permits 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 permit 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.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0189
http://www.squid-cache.org/Advisories/SQUID-2004_1.txt


Solution:
Squid can be updated as follows:
# emerge sync
# emerge -pv ">=www-proxy/squid-2.5.5"
# emerge ">=www-proxy/squid-2.5.5"


Network Security Threat Level: Medium


Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

Cables, Connectors

UBIQUITI - US UF-MM-1G-20 20PK U FIBER MULTI-MODE MODULE
$162.53
UBIQUITI - US UF-MM-1G-20 20PK U FIBER MULTI-MODE MODULE pictureUBIQUITI - US UF-MM-10G 2PK U FIBER MULTI-MODE MODULE
$30.0
UBIQUITI - US UF-MM-10G 2PK U FIBER MULTI-MODE MODULE pictureHP J9726A 2920-24G 24-Port Gigabit RJ45 and 4× SFP Ports Managed Switch
$175.0
HP J9726A 2920-24G 24-Port Gigabit RJ45 and 4× SFP Ports Managed Switch pictureNOB Transition Networks (4) Port Dual Speed 1000/10G SFP Module - For Data Netwo
$772.36
NOB Transition Networks (4) Port Dual Speed 1000/10G SFP Module - For Data Netwo picture


Discussions

No Discussions have been posted on this vulnerability.