CVE-2011-4508 Information

Description

The HMI web server in Siemens WinCC flexible 2004 2005 2007 and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; the TP OP MP Comfort Panels and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime generates predictable authentication tokens for cookies which makes it easier for remote attackers to bypass authentication via a crafted cookie.

Reference

http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-345442.pdf http://www.us-cert.gov/control_systems/pdf/ICSA-12-030-01.pdf