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Gentoo Linux Advisory: Squid

Jun 18, 2004, 03:15 (0 Talkback[s])

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Gentoo Linux Security Advisory GLSA 200406-13

Severity: High
Title: Squid: NTLM authentication helper buffer overflow
Date: June 17, 2004
Bugs: #53367
ID: 200406-13


Squid contains a bug where it fails to properly check bounds of the 'pass' variable.


Squid contains a bug in the function ntlm_check_auth(). It fails to do proper bounds checking on the values copyied to the 'pass' variable.

Affected packages

Package Vulnerable Unaffected
1 net-www/squid <= 2.5.5-r1 >= 2.5.5-r2


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.


If Squid is configured to use NTLM authentication, an attacker could exploit this vulnerability by sending a very long password. This could lead to arbitrary code execution with the permissions of the user running Squid.


There is no known workaround at this time. All users are encouraged to upgrade to the latest available version.


All Squid users should upgrade to the latest stable version:

    # emerge sync
    # emerge -pv ">=net-www/squid-2.5.5-r2"
    # emerge ">=net-www/squid-2.5.5-r2"


[ 1 ] CAN-2004-0541


This GLSA and any updates to it are available for viewing at the Gentoo Security Website:


Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to or alternatively, you may file a bug at


Copyright 2004 Gentoo Technologies, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.