full-disclosure - [FD] Arbitrary code execution by admins in File Gallery 1.7.7 (WordPress plugin)

Open Source and information security mailing list archives

Message-ID: <47223ae36d744a56ab2c4ae18ea20b8b@security.dxw.com>
Date: Tue, 29 Apr 2014 10:32:01 +0000
From: dxw Security <security@....com>
To: fulldisclosure@...lists.org
Subject: [FD] Arbitrary code execution by admins in File Gallery 1.7.7
	(WordPress plugin)

Details
================
Software: File Gallery
Version: 1.7.7,1.7.9
Homepage: http://wordpress.org/plugins/file-gallery/
Advisory ID: dxw-1970-638
CVE: CVE-2014-2558
CVSS: 8 (High; AV:N/AC:L/Au:S/C:C/I:P/A:P)

Description
================
Arbitrary code execution by admins in File Gallery 1.7.7

Vulnerability
================
An admin user can execute arbitrary code due to using create_function(). The plugin’s authors made it tricky by using single-quotes instead of double quotes, and they replaced all single quotes with a backslash followed by single quotes. Unfortunately, escaping strings is not quite that easy. Using backslash-quote we are able to escape the backslash leaving us a quote.

Proof of concept
================

Visit the settings page (integrated into the media settings at /wp-admin/options-media.php)
Type the following into any of the plugin’s settings fields, for instance “How many page links should be shown in pagination?”:

\',phpinfo(),#
WordPress keeps eating the backslash so I’ll spell it out: backslash, apostrophe, comma, “phpinfo”, open paren, close paren, comma, hash

Click Save Changes
Part way down the page you should see the PHP logo

Mitigations
================
Upgrade to version 1.7.9.2.

Disclosure policy
================
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/

Please contact us on security@....com to acknowledge this report if you received it via a third party (for example, plugins@...dpress.org) as they generally cannot communicate with us on your behalf.

This vulnerability will be published if we do not receive a response to this report with 14 days.

Timeline
================

2013-10-08: Discovered
2014-03-17: Reported to plugins@...dpress.org
2014-04-24: Updated version available

<<<<<<< HEAD

Discovered by dxw:
================
Tom Adams
=======

Discovered by dxw:
================
Tom Adams
>>>>>>> 65c687d5cb3c4aa66c28a30a4f2aaf33169dc464
Please visit security.dxw.com for more information.

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