[Full-disclosure] [ GLSA 200704-18 ] Courier-IMAP: Remote execution of arbitrary code

[Raphael Marichez]

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Gentoo Linux Security Advisory                           GLSA 200704-18
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Courier-IMAP: Remote execution of arbitrary code
      Date: April 22, 2007
      Bugs: #168196
        ID: 200704-18

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Synopsis
========

A vulnerability has been discovered in Courier-IMAP allowing for remote
code execution with root privileges.

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     < 4.0.6-r2                  >= 4.0.6-r2

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

CJ Kucera has discovered that some Courier-IMAP scripts don't properly
handle the XMAILDIR variable, allowing for shell command injection.

Impact
======

A remote attacker could send specially crafted login credentials to a
Courier-IMAP server instance, possibly leading to remote code execution
with root privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Courier-IMAP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-mail/courier-imap-4.0.6-r2"

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

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

  http://security.gentoo.org/glsa/glsa-200704-18.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 at gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 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/2.5
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