glsa-200403-06.xml


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

<glsa id="200403-06">
  <title>Multiple remote buffer overflow vulnerabilities in Courier</title>
  <synopsis>
    Remote buffer overflow vulnerabilities have been found in Courier-IMAP and
    Courier MTA. These exploits may allow the execution of abritrary code,
    allowing unauthorized access to a vulnerable system. 
  </synopsis>
  <product type="ebuild">Courier</product>
  <announced>March 26, 2004</announced>
  <revised>March 26, 2004: 01</revised>
  <bug>45584</bug>
  <access>remote</access>
  <affected>
    <package name="net-mail/courier-imap" auto="yes" arch="*">
      <unaffected range="ge">3.0.0</unaffected>
      <vulnerable range="lt">3.0.0</vulnerable>
    </package>
    <package name="mail-mta/courier" auto="yes" arch="*">
      <unaffected range="ge">0.45</unaffected>
      <vulnerable range="lt">0.45</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Courier MTA is a multiprotocol mail server suite that provides webmail,
    mailing lists, IMAP, and POP3 services. Courier-IMAP is a standalone server
    that gives IMAP access to local mailboxes.
    </p>
  </background>
  <description>
    <p>
    The vulnerabilities have been found in the 'SHIFT_JIS' converter in
    'shiftjis.c' and 'ISO2022JP' converter in 'so2022jp.c'. An attacker may
    supply Unicode characters that exceed BMP (Basic Multilingual Plane) range,
    causing an overflow.
    </p>
  </description>
  <impact type="normal">
    <p>
    An attacker without privileges may exploit this vulnerability remotely, allowing arbitrary code to be executed in order to gain unauthorized access. 
    </p>
  </impact>
  <workaround>
    <p>
    While a workaround is not currently known for this issue, all users are
    advised to upgrade to the latest version of the affected packages.
    </p>
  </workaround>
  <resolution>
    <p>
    All users should upgrade to current versions of the affected packages:
    </p>
    <code>
    # emerge sync

    # emerge -pv ">=net-mail/courier-imap-3.0.0"
    # emerge ">=net-mail/courier-imap-3.0.0"

    # ** Or; depending on your installation... **

    # emerge -pv ">=mail-mta/courier-0.45"
    # emerge ">=mail-mta/courier-0.45"
    </code>
  </resolution>
  <references>
    <uri link="http://www.securityfocus.com/bid/9845">Courier Multiple Remote Buffer Overflow Vulnerabilities</uri>
    <uri link="http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0224">CAN-2004-0224</uri>
  </references>
</glsa>