[ GLSA 200501-39 ] SquirrelMail: Multiple vulnerabilities

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200501-39
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                                            http://security.gentoo.org/
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  Severity: High
     Title: SquirrelMail: Multiple vulnerabilities
      Date: January 28, 2005
      Bugs: #78116
        ID: 200501-39

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Synopsis
========

SquirrelMail fails to properly sanitize user input, which could lead to
arbitrary code execution and compromise webmail accounts.

Background
==========

SquirrelMail is a webmail package written in PHP. It supports IMAP and
SMTP and can optionally be installed with SQL support.

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

    -------------------------------------------------------------------
     Package                   /   Vulnerable   /           Unaffected
    -------------------------------------------------------------------
  1  mail-client/squirrelmail     <= 1.4.3a-r2                >= 1.4.4

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

SquirrelMail fails to properly sanitize certain strings when decoding
specially-crafted strings, which can lead to PHP file inclusion and
XSS.

* Insufficient checking of incoming URLs in prefs.php (CAN-2005-0075)
  and in webmail.php (CAN-2005-0103).

* Insufficient escaping of integers in webmail.php (CAN-2005-0104).

Impact
======

By sending a specially-crafted URL, an attacker can execute arbitrary
code from the local system with the permissions of the web server.
Furthermore by enticing a user to load a specially-crafted URL, it is
possible to display arbitrary remote web pages in Squirrelmail's
frameset and execute arbitrary scripts running in the context of the
victim's browser. This could lead to a compromise of the user's webmail
account, cookie theft, etc.

Workaround
==========

The arbitrary code execution is only possible with "register_globals"
set to "On". Gentoo ships PHP with "register_globals" set to "Off" by
default. There are no known workarounds for the other issues at this
time.

Resolution
==========

All SquirrelMail users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=mail-client/squirrelmail-1.4.4"

Note: Users with the vhosts USE flag set should manually use
webapp-config to finalize the update.

References
==========

  [ 1 ] SquirrelMail Advisory
        http://sourceforge.net/mailarchive/message.php?msg_id=10628451
  [ 2 ] CAN-2005-0075
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0075
  [ 3 ] CAN-2005-0103
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0103
  [ 4 ] CAN-2005-0104
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0104

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

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

  http://security.gentoo.org/glsa/glsa-200501-39.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 2005 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/2.0

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