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iDEFENSE Security Advisory 2007-07-11.3

iDEFENSE Security Advisory 2007-07-11.3
Posted Jul 12, 2007
Authored by iDefense Labs | Site idefense.com

iDefense Security Advisory 07.11.07 - Remote exploitation of a command injection vulnerability in the G/PGP Encryption Plugin for The SquirrelMail Project Team's SquirrelMail webmail package allows attackers to execute arbitrary commands with the privileges of the underlying web server. The deleteKey() functionality is affected. iDefense has confirmed the existence of this vulnerability in the latest version of the G/PGP Encryption Plugin for SquirrelMail, version 2.1. Furthermore, this vulnerability has been confirmed to exist as early as version 2.0. Other versions may be affected.

tags | advisory, remote, web, arbitrary
advisories | CVE-2005-1924
SHA-256 | 43d1374bb1007f95f5034258701359c58204a59a8e93b7fd871ca1983f6a250c

iDEFENSE Security Advisory 2007-07-11.3

Change Mirror Download
SquirrelMail G/PGP Plugin deleteKey() Command Injection Vulnerability

iDefense Security Advisory 07.11.07
http://labs.idefense.com/intelligence/vulnerabilities/
Jul 11, 2007

I. BACKGROUND

The SquirrelMail G/PGP Encrpytion Plugin is a general purpose
encryption, decryption, and digital signature plug-in for SquirrelMail
that implements the OpenPGP standard using GPG. More information is
available at the following URL.

http://www.squirrelmail.org/plugin_view.php?id=153

II. DESCRIPTION

Remote exploitation of a command injection vulnerability in the G/PGP
Encrpytion Plugin for The SquirrelMail Project Team's SquirrelMail
webmail package allows attackers to execute arbitrary commands with the
privileges of the underlying web server.

The problem specifically exists within the function deleteKey() defined
in gpg_keyring.php. A call is made to exec() with unfiltered
user-supplied data as demonstrated in the following piece of code:

$command = "$path_to_gpg --batch --no-tty --yes --homedir \
$gpg_key_dir $flag $fpr 2>&1";
exec($command, $output, $returnval);

The deleteKey() routine is called from three files: import_key_file.php,
import_key_text.php and keyring_main.php. the '$fpr' variable from above
is supplied in the POST data. The attacker must have a valid
authenticated session to exploit this vulnerability.

III. ANALYSIS

Exploitation of the described vulnerability allows authenticated remote
attackers to execute arbitrary commands with the privileges of the
underlying web server.

This vulnerability could be exploited by webmail users to gain shell
access on the target server and potentially further compromise the
system with local privilege escalation vulnerabilities.

IV. DETECTION

iDefense has confirmed the existence of this vulnerability in the latest
version of the G/PGP Encryption Plugin for SquirrelMail, version 2.1.
Furthermore, this vulnerability has been confirmed to exist as early as
version 2.0. Other versions may be affected.

V. WORKAROUND

Disable the G/PGP Plugin if it is not required. Alternatively, add the
following line above the initialization of the '$command' variable just
prior to the call to exec():

$fpr = escapeshellarg($fpr);

Please note that this is an unofficial source patch, but should be
sufficient as a workaround until an official patch is released from the
vendor.

VI. VENDOR RESPONSE

The maintainers of the SquirrelMail G/PGP plug-in have not responded to
repeated inquires regarding this vulnerability. As such, it remains
unpatched, even in the most current release made on July 7th, 2007.

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2005-1924 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

10/27/2005 Initial vendor notification
10/27/2005 Initial vendor response
03/02/2006 Second vendor notification
02/16/2007 Third vendor notification
07/11/2007 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 © 2007 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.
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