[ GLSA 200410-15 ] Squid: Remote DoS vulnerability

From: Luke Macken (lewk_at_gentoo.org)
Date: 10/18/04

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    To: gentoo-announce@gentoo.org
Date: Mon, 18 Oct 2004 15:15:28 -0400

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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
            http://www.idefense.com/application/poi/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

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