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Gentoo Linux Security Advisory                           GLSA 200410-15
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Squid: Remote DoS vulnerability
      Date: October 18, 2004
      Bugs: #67167
        ID: 200410-15

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Synopsis
========

Squid contains a vulnerability in the SNMP module which may lead to a
denial of service.

Background
==========

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.

Affected packages
=================

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  www-proxy/squid       < 2.5.7                            >= 2.5.7

Description
===========

A parsing error exists in the SNMP module of Squid where a
specially-crafted UDP packet can potentially cause the server to
restart, closing all current connections. This vulnerability only
exists in versions of Squid compiled with the 'snmp' USE flag.

Impact
======

An attacker can repeatedly send these malicious UDP packets to the
Squid server, leading to a denial of service.

Workaround
==========

Disable SNMP support or filter the port that has SNMP processing
(default is 3401) to allow only SNMP data from trusted hosts.

To disable SNMP support put the entry snmp_port 0 in the squid.conf
configuration file.

To allow only the local interface to process SNMP, add the entry
"snmp_incoming_address 127.0.0.1" in the squid.conf configuration file.

Resolution
==========

All Squid users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=www-proxy/squid-2.5.7"
    # emerge ">=www-proxy/squid-2.5.7"

References
==========

  [ 1 ] iDEFENSE Advisory
        display?id=152&type=vulnerabilities&flashstatus=true

Availability
============

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

  http://security.gentoo.org/glsa/glsa-200410-15.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 Foundation, 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