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Squid: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200501-25 / squid
Release Date January 16, 2005
Latest Revision February 07, 2005: 03
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-proxy/squid < 2.5.7-r2 >= 2.5.7-r2 All supported architectures

Related bugreports: #77934, #77521


Squid contains vulnerabilities in the the code handling NTLM (NT Lan Manager), Gopher to HTML, ACLs and WCCP (Web Cache Communication Protocol) which could lead to ACL bypass, denial of service and arbitrary code execution.

2.  Impact Information


Squid is a full-featured Web proxy cache designed to run on Unix systems. It supports proxying and caching of HTTP, FTP, and other URLs, as well as SSL support, cache hierarchies, transparent caching, access control lists and many other features.


Squid contains a vulnerability in the gopherToHTML function (CAN-2005-0094) and incorrectly checks the 'number of caches' field when parsing WCCP_I_SEE_YOU messages (CAN-2005-0095). Furthermore the NTLM code contains two errors. One is a memory leak in the fakeauth_auth helper (CAN-2005-0096) and the other is a NULL pointer dereferencing error (CAN-2005-0097). Finally Squid also contains an error in the ACL parsing code (CAN-2005-0194).


With the WCCP issue an attacker could cause denial of service by sending a specially crafted UDP packet. With the Gopher issue an attacker might be able to execute arbitrary code by enticing a user to connect to a malicious Gopher server. The NTLM issues could lead to denial of service by memory consumption or by crashing Squid. The ACL issue could lead to ACL bypass.

3.  Resolution Information


There is no known workaround at this time.


All Squid users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-proxy/squid-2.5.7-r2"

4.  References


Page updated January 16, 2005

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