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WordPress Advanced Access Manager 2.8.2 File Write / Code

Author: Daya iLLi , Published: 15-09-2014
Full title	WordPress Advanced Access Manager 2.8.2 File Write / Code Execution
Date add 05/09/2014
Author Daya iLLi
Platform PHP
Risk Critical

WordPress Advanced Access Manager plugin version 2.8.2 suffers from arbitrary file write and code execution vulnerabilities.

Software: Advanced Access Manager
Version: 2.8.2
Homepage: http://wordpress.org/plugins/advanced-access-manager/
Advisory report: https://security.dxw.com/advisories/advanced-access-manager-allows-admin-users-to-write-arbitrary-text-to-arbitrary-locations-which-could-lead-to-arbitrary-code-execution-etc/
CVE: CVE-2014-6059
CVSS: 6.5 (Medium; AV:N/AC:L/Au:S/C:P/I:P/A:P)

Advanced Access Manager allows admin users to write arbitrary files and execute arbitrary php

Advanced Access Manager allows writing arbitrary content to arbitrary files. Depending on the server configuration this could allow arbitrary code execution, overwriting core WordPress files and e.g. blanking wp-config.php. In other configurations this could lead to overwriting files in the uploads directory.

Proof of concept

Visit http://localhost/wp-admin/admin.php?page=aam-configpress
Press “Save” (this creates the “aam_configpress” option)
Visit http://localhost/wp-admin/options.php
Set “aam_configpress” to “test.php”
Press “Save Changes”
Visit http://localhost/wp-admin/admin.php?page=aam-configpress again
Enter “<?php phpinfo();” into the textarea (without the quotes)
Press “Save”
Visit http://localhost/wp-content/aam/test.php

Note that there is no restriction on using “../” in the “aam_configpress” option so depending on server configuration you could create files anywhere on the filesystem.
This attack could be scripted to allow upload of binary files, including executable files.

Upgrade to version 2.8.3 or later

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@dxw.com to acknowledge this report if you received it via a third party (for example, plugins@wordpress.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.

Daya iLLi
Skype : daya.illi

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