PT-2013-64: Access Control Bypassing in Bitrix CMS

Vulnerable software

Bitrix CMS

Version: 12.5.7 and earlier

Link:
http://www.1c-bitrix.ru/products/cms/

Severity level

Severity level: Medium
Impact: Integrity Violation
Access Vector: Local

CVSS v2:
Base Score: 4.6
Vector: (AV:L/AC:L/Au:S/C:N/I:C/A:N)

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 an Access Control Bypassing vulnerability in Bitrix CMS.

This vulnerability has been discovered in the integrity check mechanism of the "Script Integrity Monitor", which allows an attacker to forge the integrity check mechanism and modify files in the system, bypassing access control mechanisms.

How to fix

Update your software up to the latest version.

Advisory status

04.09.2013 - Vendor gets vulnerability details
06.09.2013 - Vendor releases fixed version and details
15.07.2014 - Public disclosure

Credits

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

References

http://en.securitylab.ru/lab/PT-2013-64

Reports on the vulnerabilities previously discovered by Positive Research:

http://www.ptsecurity.com/research/advisory/
http://en.securitylab.ru/lab/