PT-2012-57: Privilege Gaining in Bitrix CMS

Vulnerable software

Bitrix CMS

Version: 11.5.6 and earlier


Severity level

Severity level: High
Impact: Administrator Privilege Gaining
Access Vector: Remote

CVSS v2:
Base Score: 10
Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVE: not assigned

Software description

Bitrix CMS is a professional web content management system.

Vulnerability description

The specialists of the Positive Research center have detected a Privilege Gaining vulnerability in Bitrix CMS.

The vulnerability is possible due to the fact that Bitrix CMS uses mt_rand() pseudorandom number generator for generation of the password reset token, which can be potentially predicted under certain conditions.

How to fix

Update your software up to the latest version.

Advisory status

03.09.2012 - Vendor gets vulnerability details
10.09.2012 - Vendor releases fixed version and details
15.07.2014 - Public disclosure


The vulnerability was detected by Timur Yunusov, Positive Research Center (Positive Technologies Company)


Reports on the vulnerabilities previously discovered by Positive Research: