OV3 Online Administration 3.0 Parameter Traversal Arbitrary File Access PoC Exploit

Title: OV3 Online Administration 3.0 Parameter Traversal Arbitrary File Access PoC Exploit
Advisory ID: ZSL-2017-5410
Type: Local/Remote
Impact: Exposure of System Information, Exposure of Sensitive Information
Risk: (4/5)
Release Date: 30.05.2017
With the decision to use the OV3 as a platform for your data management, the course is set for scalable, flexible and high-performance applications. Whether you use the OV3 for your internal data management or use it for commercial business applications such as shops, portals, etc. Thanks to the data-based structure of the OV3, you always have the best tool at your fingertips. The OV3 is a 100% web-based tool. This eliminates the need to install a new software on all participating client computers. All elements are operated by a standard browser. Further advantages are the location-dependent use and - particularly with ASP solutions - the reduced costs for local hardware like own servers and modern client workstations.
The application (Online Verwaltung III) suffers from an unauthenticated file disclosure vulnerability when input passed thru the 'file' parameter to 'download.php' script is not properly verified before being used to include files. This can be exploited to read arbitrary files from local resources with directory traversal attacks.



67: header("Expires: Mon, 1 Apr 1990 00:00:00 GMT");
68: header("Last-Modified: " . gmdate("D,d M YH:i:s") . " GMT");
69: /*
70: header("Cache-Control: no-cache, must-revalidate");
71: header("Pragma: no-cache");
72: */
73: header("Pragma: ");
74: header("Cache-Control: ");
75: header("Content-type: application/octet-stream");
76: header("Content-Type: application/force-download");
77: $dname = rawurlencode($name);
78: header("Content-Disposition: attachment; filename=\"$dname\";");
80: if ($export==1) {
81: if (is_file($path.'/'.$file)) {
82: header('Content-Length: '.filesize($path.'/'.$file));
83: readfile($path.'/'.$file);
84: } elseif (is_file(utf8_decode($path.'/'.$file))) {
85: header('Content-Length: '.filesize(utf8_decode($path.'/'.$file)));
86: readfile(utf8_decode($path.'/'.$file));
87: }
88: }


novaCapta Software & Consulting GmbH - http://www.meacon.de
Affected Version
Tested On
CentOS release 6.8 (Final)
Vendor Status
[14.11.2016] Vendor contacted.
[26.12.2016] Vulnerability discovered.
[29.05.2017] No response from the vendor.
[30.05.2017] Public security advisory released.
Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>
[1] https://www.exploit-db.com/exploits/42095/
[2] https://packetstormsecurity.com/files/142748
[3] https://cxsecurity.com/issue/WLB-2017050224
[4] https://exchange.xforce.ibmcloud.com/vulnerabilities/126635
[30.05.2017] - Initial release
[02.06.2017] - Added reference [1], [2] and [3]
[08.06.2017] - Added reference [4]
Zero Science Lab

Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk