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Date: Wed, 30 May 2012 23:38:29 +0100
From: "Joseph Sheridan" <joe@...ctionis.com>
To: "'full-disclosure'" <full-disclosure@...ts.grok.org.uk>,
"'bugtraq'" <bugtraq@...urityfocus.com>,
<secalert@...urityreason.com>,
<bugs@...uritytracker.com>,
"'vuln'" <vuln@...unia.com>,
<vuln@...urity.nnov.ru>,
<news@...uriteam.com>,
<moderators@...db.org>,
<submissions@...ketstormsecurity.org>,
<submit@...ecurity.com>,
<oss-security@...ts.openwall.com>
Subject: ScriptFu Server Buffer Overflow in GIMP <= 2.6
Vulnerability Summary
=================
There is a buffer overflow in the script-fu server component of GIMP
(the GNU Image Manipulation Program) in all 2.6 versions (Windows and Linux
versions) affecting both
the script-fu console and the script-fu network server. A crafted msg to the
script-fu server overflows a buffer and overwrites several function pointers
allowing the attacker to gain control of EIP and potentially execute
arbitrary
code. This issue is fixed in the latest, stable GIMP version (currently
2.8.0).
CVE number: CVE-2012-2763
Impact: high
Vendor Homepage: http://www.gimp.org/
Date found: 18/05/2012
Found by: Joseph Sheridan of Reaction Information Security
Homepage: http://www.reactionpenetrationtesting.co.uk
This advisory is posted at:
http://www.reactionpenetrationtesting.co.uk/advisories/scriptfu-buffer-overf
low-GIMP-2.6.html
PoC Code is available here:
http://www.reactionpenetrationtesting.co.uk/advisories/scriptfubof.c
Affected Products
=================
Vulnerable Products
+------------------
The following products are known to be affected by this vulnerability:
* GIMP <= 2.6.12 (Windows or Linux builds)
Products Confirmed Not Vulnerable
+--------------------------------
The following products are known not to be affected by this
vulnerability:
* GIMP 2.8.0 (current stable release)
Details
=======
There is a buffer overflow in the command parsing code such that a long
command
overwrites various function pointers on the heap and gives the attacker full
control
of EIP. The following command sent to the script-fu server will trigger the
vulnerability:
(file-bmp-load 123
aaaaaaaaaaaaa...a*1000...aaaaaaaaaa
raw-filename)
Impact
======
Successful exploitation of the vulnerability may result in remote code
execution.
Solution
===========
Upgrade to the latest stable version of GIMP (currently 2.8 branch) - the
2.6 branch is
no longer supported by the GIMP development team.
Workarounds
===========
A workaround would be not to use this feature on a vulnerable version of
GIMP.
The GIMP development team have strongly suggested only using the
script-fu network server in a secure/sandboxed environment due to
security concerns.
Updates
============
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/advisories/scriptfu-buffer-overf
low-GIMP-2.6.html
============================================================================
====
Reaction Information Security
Lombard House Business Centre,
Suite 117,
12-17 Upper Bridge Street,
Canterbury, Kent, CT1 2NF
Phone: +44 (0)1227 785050
Email: research () reactionis {dot} co {dot} uk
Web: http://www.reactionpenetrationtesting.co.uk
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