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Oxwall 1.7.0 Remote Code Execution Exploit

High
Advisory ID
ZSL-2014-5196
Release Date
28 July 2014
Vendor
Oxwall Software Foundation - http://www.oxwall.org
Affected Version
1.7.0 (build 7907 and 7906)
CVE
N/A
Tested On
Kali Linux 3.7-trunk-686-pae, Apache/2.2.22 (Debian), PHP 5.4.4-13(apache2handler), MySQL 5.5.28
Summary

Oxwall is unbelievably flexible and easy to use PHP/MySQL social networking software platform.

Description

Oxwall suffers from an authenticated arbitrary PHP code execution. The vulnerability is caused due to the improper verification of uploaded files in '/admin/settings/user' script thru the 'avatar' and 'bigAvatar' POST parameters. This can be exploited to execute arbitrary PHP code by uploading a malicious PHP script file with '.php5' extension (to bypass the '.htaccess' block rule) that will be stored in '/ow_userfiles/plugins/base/avatars/' directory.

Proof of Concept
oxwall_rce.pyTXT
Disclosure Timeline
18.07.2014Vulnerabilities discovered.
18.07.2014Vendor contacted.
20.07.2014No reply from the vendor.
21.07.2014Vendor contacted again.
23.07.2014Reminded vendor on twitter to check their e-mails.
23.07.2014No reply from the vendor whatsoever.
23.07.2014Created a forum account and contacted the vendor there.
24.07.2014Vendor responds on the forum post asking more details.
24.07.2014Informed the vendor to conference via e-mail.
25.07.2014Vendor responds on the e-mails sent previously, asking more details.
25.07.2014Sent detailed information to the vendor.
27.07.2014Asked vendor for status update.
27.07.2014No reply from the vendor.
28.07.2014Public security advisory released.
Credits
Vulnerability discovered by Gjoko Krstic
References
[1]http://www.exploit-db.com/exploits/34191/
[2]http://packetstormsecurity.com/files/127653
[3]http://cxsecurity.com/issue/WLB-2014070156
[4]http://osvdb.org/show/osvdb/109626
[5]http://www.securityfocus.com/bid/68937
[6]http://sebug.net/vuldb/ssvid-87163
[7]http://xforce.iss.net/xforce/xfdb/94914
Changelog
28.07.2014Initial release
29.07.2014Added reference [1], [2], [3] and [4]
30.07.2014Added reference [5] and [6]
20.10.2014Added reference [7]