full-disclosure - Re: GIMP Scriptfu Python Remote Command Execution

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Date: Mon, 20 Aug 2012 00:32:58 +0100
From: "research" <research@...ctionis.co.uk>
To: 'Julius Kivimäki' <julius.kivimaki@...il.com>
Cc: vuln@...urity.nnov.ru, 'vuln' <vuln@...unia.com>, news@...uriteam.com,
	secalert@...urityreason.com, submit@...ecurity.com,
	bugs@...uritytracker.com,
	'full-disclosure' <full-disclosure@...ts.grok.org.uk>,
	'bugtraq' <bugtraq@...urityfocus.com>, submissions@...ketstormsecurity.org,
	oss-security@...ts.openwall.com, moderators@...db.org
Subject: Re: GIMP Scriptfu Python Remote Command Execution

The scriptfu network server (when enabled) does not require authentication
and will run commands from anyone that can connect to its tcp port (usually
10008).

From: Julius Kivimäki [mailto:julius.kivimaki@...il.com] 
Sent: 17 August 2012 11:26
To: research
Cc: full-disclosure; bugtraq; secalert@...urityreason.com;
bugs@...uritytracker.com; vuln; vuln@...urity.nnov.ru; news@...uriteam.com;
moderators@...db.org; submissions@...ketstormsecurity.org;
submit@...ecurity.com; oss-security@...ts.openwall.com
Subject: Re: [Full-disclosure] GIMP Scriptfu Python Remote Command Execution

Where exactly is the vulnerability here? I am unable to see it myself, it
appears that you are using an eval function to evaluate code which isn't
exactly a security issue.

2012/8/17 research <research@...ctionis.co.uk>

Summary
=======

There is an arbitrary command execution vulnerability in the scriptfu
network server
console in the GIMP 2.6 branch. It is possible to use a python scriptfu
command to run
arbitrary operating-system commands and potentially take full control of the
host.

The advisory is posted here:
http://www.reactionpenetrationtesting.co.uk/GIMP-scriptfu-python-command-exe
<http://www.reactionpenetrationtesting.co.uk/GIMP-scriptfu-python-command-ex
e%0d%0acution.html> 
cution.html

CVE number: CVE-2012-4245
Vendor homepage: http://www.gimp.org/
Vendor notified: 9/8/2012

Affected Products
=================

GIMP 2.6 branch (Windows or Linux builds)

Non-Affected Products
=====================

The Scriptfu network server component does not currently work in the GIMP
2.8 branch
(Windows or Linux builds).

Details
=======

There is an arbitrary command execution vulnerability in the scriptfu
network server
console in the GIMP 2.6 branch. It is possible to use a python scriptfu
command to run
arbitrary operating-system commands and potentially take full control of the
host.
The following command will write "foo" to "/tmp/owned":

(python-fu-eval 0 "file = open('/tmp/owned','w')\nfile.write('foo')")

Impact
======

Successful exploitation of the vulnerability may result in remote command
execution.

Solution
===========
No solution has been implemented at this stage apart from the workaround
below.

Workaround
===========

Do not enable the scriptfu network server.
The GIMP development team have stated that this component was not designed
with security
 in mind and therefore should not be used in production environments.

Distribution
============

In addition to posting on the website, a text version of this notice
is posted to the following e-mail and Usenet news recipients.

  * bugtraq () securityfocus com
  * full-disclosure () lists grok org uk

Future updates of this advisory, if any, will be placed on the ReactionIS
corporate website, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the URL below for any updates:

http://www.reactionpenetrationtesting.co.uk/GIMP-scriptfu-python-command-exe
<http://www.reactionpenetrationtesting.co.uk/GIMP-scriptfu-python-command-ex
e%0d%0acution.html> 
cution.html

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

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