[ GLSA 200408-19 ] courier-imap: Remote Format String Vulnerability

From: Joshua J. Berry (condordes_at_gentoo.org)
Date: 08/20/04

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    Gentoo Linux Security Advisory GLSA 200408-19
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                                                http://security.gentoo.org/
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      Severity: High
         Title: courier-imap: Remote Format String Vulnerability
          Date: August 19, 2004
          Bugs: #60865
            ID: 200408-19

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    Synopsis
    ========

    There is a format string vulnerability in non-standard configurations
    of courier-imapd which may be exploited remotely. An attacker may be
    able to execute arbitrary code as the user running courier-imapd
    (oftentimes root).

    Background
    ==========

    Courier-IMAP is an IMAP server which is part of the Courier mail
    system. It provides access only to maildirs.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-mail/courier-imap <= 3.0.2-r1 >= 3.0.5

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

    There is a format string vulnerability in the auth_debug() function
    which can be exploited remotely, potentially leading to arbitrary code
    execution as the user running the IMAP daemon (oftentimes root). A
    remote attacker may send username or password information containing
    printf() format tokens (such as "%s"), which will crash the server or
    cause it to execute arbitrary code.

    This vulnerability can only be exploited if DEBUG_LOGIN is set to
    something other than 0 in the imapd config file.

    Impact
    ======

    If DEBUG_LOGIN is enabled in the imapd configuration, a remote attacker
    may execute arbitrary code as the root user.

    Workaround
    ==========

    Set the DEBUG_LOGIN option in /etc/courier-imap/imapd to 0. (This is
    the default value.)

    Resolution
    ==========

    All courier-imap users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=net-mail/courier-imap-3.0.5"
        # emerge ">=net-mail/courier-imap-3.0.5"

    References
    ==========

      [ 1 ] iDEFENSE Advisory
            http://www.idefense.com/application/poi/display?id=131&type=vulnerabilities&flashstatus=true

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

        http://security.gentoo.org/glsa/glsa-200408-19.xml

    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.

    License
    =======

    Copyright 2004 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/1.0

    
    



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