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OV3 Online Administration 3.0 Parameter Traversal Arbitrary File Access PoC Exploit

High
Advisory ID
ZSL-2017-5410
Release Date
30 May 2017
Vendor
novaCapta Software & Consulting GmbH - http://www.meacon.de
Affected Version
3.0
CVE
N/A
Tested On
CentOS release 6.8 (Final), PHP/5.3.3, Apache/2.2.15, MySQL/5.0.11
Summary

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.

Description

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.

/download.php ------------------------ 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=\"$dname\";"); 79: 80: if ($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: }
Proof of Concept
ov3_lfi.txtTXT
Disclosure Timeline
14.11.2016Vendor contacted.
26.12.2016Vulnerability discovered.
29.05.2017No response from the vendor.
30.05.2017Public security advisory released.
Credits
Vulnerability discovered by Gjoko Krstic
References
[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
Changelog
30.05.2017Initial release
02.06.2017Added reference [1], [2] and [3]
08.06.2017Added reference [4]