(Gentoo Issues Fix) Squid ntlm_check_auth() Buffer Overflow Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1010516
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SecurityTracker URL: http://securitytracker.com/id?1010516
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CVE Reference: CAN-2004-0541
(Links to External Site)
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Date: Jun 17 2004
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Impact: Execution of arbitrary code via network, User access via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): 3.*-PRE, 2.5.*
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Description: iDEFENSE reported a buffer overflow vulnerability in Squid in the processing of NTLM authentication messages. A remote user can execute arbitrary code on the target system.
It is reported that if the proxy is configured to use the NTLM authentication helper, a remote user can send a specially crafted
password to trigger a buffer overflow in 'helpers/ntlm_auth/SMB/libntlmssp.c' in the ntlm_check_auth() function.
The vendor was
reportedly notified on May 20, 2004.
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Impact: A remote user can execute arbitrary code on the target system.
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Solution: Gentoo has released a fix and indicates that 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"
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Vendor URL: www.squid-cache.org/ (Links to External Site)
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Cause: Boundary error
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Underlying OS: Linux (Gentoo)
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Reported By: Kurt Lieber <klieber@gentoo.org>
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 17 Jun 2004 12:04:57 +0000
From: Kurt Lieber <klieber@gentoo.org>
Subject: [gentoo-announce] [ GLSA 200406-13 ] Squid: NTLM authentication helper buffer overflow
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Gentoo Linux Security Advisory GLSA 200406-13
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http://security.gentoo.org/
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Severity: High
Title: Squid: NTLM authentication helper buffer overflow
Date: June 17, 2004
Bugs: #53367
ID: 200406-13
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Synopsis
========
Squid contains a bug where it fails to properly check bounds of the
'pass' variable.
Background
==========
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
Description
===========
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.
Impact
======
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.
Workaround
==========
There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version.
Resolution
==========
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"
References
==========
[ 1 ] CAN-2004-0541
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0541
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200406-13.xml
Concerns?
=========
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
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
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.
http://creativecommons.org/licenses/by-sa/1.0
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