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>2004-06-09</announced>
  <revised count="03">2007-12-30</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
    "apache". 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 "&gt;=net-www/mod_ssl-2.8.18"
    # emerge "&gt;=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 "&gt;=www-servers/apache-2.0.49-r3"
    # emerge "&gt;=www-servers/apache-2.0.49-r3"</code>
  </resolution>
  <references>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0488">CAN-2004-0488</uri>
  </references>
  <metadata tag="submitter">
    dmargoli
  </metadata>
</glsa>