glsa-200406-05.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="200406-05">
  <title>Apache: Buffer overflow in mod_ssl</title>
  <synopsis>
    A bug in mod_ssl may allow a remote attacker to execute remote code when
    Apache is configured a certain way.
  </synopsis>
  <product type="ebuild">Apache</product>
  <announced>June 09, 2004</announced>
  <revised>December 30, 2007: 03</revised>
  <bug>51368</bug>
  <access>remote</access>
  <affected>
    <package name="net-www/mod_ssl" auto="yes" arch="*">
      <unaffected range="ge">2.8.18</unaffected>
      <vulnerable range="lt">2.8.18</vulnerable>
    </package>
    <package name="www-servers/apache" auto="yes" arch="*">
      <unaffected range="lt">2.0</unaffected>
      <unaffected range="ge">2.0.49-r3</unaffected>
      <vulnerable range="le">2.0.49-r2</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Apache is the most popular Web server on the Internet. mod_ssl provides
    Secure Sockets Layer encryption and authentication to Apache 1.3. Apache 2
    contains the functionality of mod_ssl.
    </p>
  </background>
  <description>
    <p>
    A bug in the function ssl_util_uuencode_binary in ssl_util.c may lead to a
    remote buffer overflow on a server configured to use FakeBasicAuth that
    will trust a client certificate with an issuing CA with a subject DN longer
    than 6k.
    </p>
  </description>
  <impact type="high">
    <p>
    Given the right server configuration, an attacker could cause a Denial of
    Service or execute code as the user running Apache, usually
    &quot;apache&quot;. It is thought to be impossible to exploit this to
    execute code on the x86 platform, but the possibility for other platforms
    is unknown. This does not preclude a DoS on x86 systems.
    </p>
  </impact>
  <workaround>
    <p>
    A server should not be vulnerable if it is not configured to use
    FakeBasicAuth and to trust a client CA with a long subject DN.
    </p>
  </workaround>
  <resolution>
    <p>
    Apache 1.x users should upgrade to the latest version of mod_ssl:
    </p>
    <code>
    # emerge sync

    # emerge -pv ">=net-www/mod_ssl-2.8.18"
    # emerge ">=net-www/mod_ssl-2.8.18"</code>
    <p>
    Apache 2.x users should upgrade to the latest version of Apache:
    </p>
    <code>
    # emerge sync

    # emerge -pv ">=www-servers/apache-2.0.49-r3"
    # emerge ">=www-servers/apache-2.0.49-r3"</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0488">CAN-2004-0488</uri>
  </references>
  <metadata tag="submitter">
    dmargoli
  </metadata>
</glsa>