[ GLSA 200403-06 ] Multiple remote buffer overflow vulnerabilities in Courier

From: Kurt Lieber (klieber_at_gentoo.org)
Date: 03/29/04

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    Date: Mon, 29 Mar 2004 03:16:38 -0500
To: bugtraq@securityfocus.com, full-disclosure@lists.netsys.com, alerts@linuxsecurity.com

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    Gentoo Linux Security Advisory GLSA 200403-06
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                                                 http://security.gentoo.org
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      Severity: Normal
         Title: Multiple remote buffer overflow vulnerabilities in Courier
          Date: March 26, 2004
          Bugs: #45584
            ID: 200403-06

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    Synopsis
    ========

    Remote buffer overflow vulnerabilites 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.

    Background
    ==========

    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.

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
         net-mail/courier-imap < 3.0.0 >= 3.0.0
         net-mail/courier < 0.45 >= 0.45

    Description
    ===========

    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.

    Impact
    ======

    An attacker without privileges may exploit this vulnerability remotely,
    allowing arbitrary code to be executed in order to gain unauthorized
    access.

    Workaround
    ==========

    While a workaround is not currently known for this issue, all users are
    advised to upgrade to the latest version of the affected packages.

    Resolution
    ==========

    All users should upgrade to the current version of the affected
    packages:

        # 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 ">=net-mail/courier-0.45"
        # emerge ">=net-mail/courier-0.45"

    References
    ==========

      [ 1 ] http://www.securityfocus.com/bid/9845
      [ 2 ] http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0224

    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.

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