glsa-200409-04.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200409-04">
  <title>Squid: Denial of service when using NTLM authentication</title>
  <synopsis>
    Squid is vulnerable to a denial of service attack which could crash its
    NTLM helpers.
  </synopsis>
  <product type="ebuild">squid</product>
  <announced>2004-09-02</announced>
  <revised count="03">2007-12-30</revised>
  <bug>61280</bug>
  <access>remote</access>
  <affected>
    <package name="net-proxy/squid" auto="yes" arch="*">
      <unaffected range="ge">2.5.6-r2</unaffected>
      <unaffected range="lt">2.5</unaffected>
      <vulnerable range="le">2.5.6-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    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.
    </p>
  </background>
  <description>
    <p>
    Squid 2.5.x versions contain a bug in the functions ntlm_fetch_string()
    and ntlm_get_string() which lack checking the int32_t offset "o" for
    negative values.
    </p>
  </description>
  <impact type="normal">
    <p>
    A remote attacker could cause a denial of service situation by sending
    certain malformed NTLMSSP packets if NTLM authentication is enabled.
    </p>
  </impact>
  <workaround>
    <p>
    Disable NTLM authentication by removing any "auth_param ntlm program
    ..." directives from squid.conf or use ntlm_auth from Samba-3.x.
    </p>
  </workaround>
  <resolution>
    <p>
    All Squid users should upgrade to the latest stable version:
    </p>
    <code>
    # emerge sync
    
    # emerge -pv "&gt;=net-www/squid-2.5.6-r2"
    # emerge "&gt;=net-www/squid-2.5.6-r2"</code>
  </resolution>
  <references>
    <uri link="http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/#squid-2.5.STABLE6-ntlm_fetch_string">Squid-2.5 Patches</uri>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0832">CVE-2004-0832</uri>
  </references>
  <metadata tag="submitter" timestamp="2004-09-02T10:25:32Z">
    vorlon078
  </metadata>
</glsa>