-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                       ESB-2006.0874 -- [UNIX/Linux]
       Horde Kronolith Arbitrary Local File Inclusion Vulnerability
                             30 November 2006

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Horde Kronolith 2.1.3 and prior
Publisher:            iDEFENSE
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated

Original Bulletin:    http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=445

- --------------------------BEGIN INCLUDED TEXT--------------------

Horde Kronolith Arbitrary Local File Inclusion Vulnerability

iDefense Security Advisory 11.27.06
http://labs.idefense.com/intelligence/vulnerabilities/
Nov 27, 2006

I. BACKGROUND

Kronolith is a web-based calendar system written in PHP and utilizing the
Horde Application Framework. It is generally installed along side Horde's
IMP web mail product. More information can be obtained at the Kronolith
site at http://www.horde.org/kronolith/

II. DESCRIPTION

Remote exploitation of a design error in Horde's Kronolith could allow an
authenticated web mail user to execute arbitrary PHP code under the
security context of the running Web server.

The vulnerability specifically exists due to a design error in the way it
includes certain files. Specifically, the 'lib/FBView.php' file contains a
function 'Kronolith_FreeBusy_View::factory' which will include local files
that are supplied via the 'view' HTTP GET request parameter. An excerpt
from the code follows:

177      function &factory($view)
178      {
179          $driver = basename($view);
180          require_once dirname(__FILE__) . '/FBView/' . $view . '.php';

As you can see on line 179, input validation was done. However the
resulting string was not used on line 180. Instead the unfiltered variable
coming directly from the attacker is used. By utilizing directory traversal
specifiers and null bytes, an attacker can trivially cause files stored on
the Web server to be parsed as PHP code.

III. ANALYSIS

Successful exploitation could allow an attacker to include an arbitrary
local file on the affected host. Due to the lack of input validation on
$GET_['view'], directory traversal specifiers could be utilized to parse
any file on the system as PHP code.

IV. DETECTION

iDefense has confirmed that versions 2.0.1 through 2.1.3 of Horde Kronolith
are vulnerable to this issue. Other versions are also likely to be
vulnerable.

V. WORKAROUND

iDefense is unaware of any available workarounds for this vulnerability.

VI. VENDOR RESPONSE

The Horde core team has addressed this vulnerability in versions 2.0.7 and
2.1.4 of Kronolith.

VII. CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.

VIII. DISCLOSURE TIMELINE

11/21/2006  Initial vendor notification
11/21/2006  Initial vendor response
11/29/2006  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2006 iDefense, Inc.

Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of
iDefense. If you wish to reprint the whole or any part of this alert in
any other medium other than electronically, please e-mail
customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate at
the time of publishing based on currently available information. Use of
the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on, this
information.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBRW5W4Ch9+71yA2DNAQLGnAP/aoqB0FCCoshH0cZo3b2nHGylpUtj7Jd8
CcXSTxmsoHVa0mR6/RgYdP0DGgzOVbMk/ewPRkqPBc/l/yl1oMAnbyu4faUV/IWd
DgcUFmgjYAQp8ShYmiQ1SozkaNThk/AbRE6EWoSpyOe1qA4rP8pTDSxD7P4GyE4O
3i5EV8z5hXw=
=VBYF
-----END PGP SIGNATURE-----