Gentoo: SquirrelMail Multiple vulnerabilities
Posted by Joseph Shakespeare   
Gentoo SquirrelMail fails to properly sanitize user input, which could lead to arbitrary code execution and compromise webmail accounts.
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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