PT-2013-44: Forced browsing in Siemens WinCC and SIMATIC PCS 7 Vulnerable softwareSiemens WinCC Version: 7.2 and earlierSiemens SIMATIC PCS 7 Version: 8.0 SP1 and earlierApplication link: http://www.siemens.com/Severity levelSeverity level: Medium Impact: Username Access Access Vector: Remote CVSS v2: Base Score: 4.0 Vector: (AV:N/AC:L/Au:S/C:P/I:N/A:N)CVE: CVE-2013-3959Software descriptionSiemens WinCC is a part of Siemens SIMATIC HMI software that aimed to provide connection between an operator and PLCs that manage technological processes. The WebNavigator component of WinCC gives the users the possibility to control their plants via the web browser with the same look-and-feel like local operator stations.Vulnerability descriptionThe specialists of the Positive Research center have detected a vulnerability, which can be used to gain access to usernames in Siemens WinCC and SIMATIC PCS 7.The WinCC Web Navigator 7.2 allows a user with authenticated access to probe for valid NetBIOS user names by manipulating URL parameters. This could allow the attacker to obtain user names with heightened privileges.How to fixUpdate your software up to the latest versionAdvisory status 13.01.2013 - Vendor gets vulnerability details 14.06.2013 - Vendor releases fixed version and details 03.07.2013 - Public disclosureCreditsThe vulnerability was detected by Alexander Tlyapov, Positive Research Center (Positive Technologies Company)Referenceshttp://en.securitylab.ru/lab/PT-2013-44 http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-345843.pdf https://ics-cert.us-cert.gov/advisories/ICSA-13-169-02 Reports on the vulnerabilities previously discovered by Positive Research:http://ptsecurity.com/research/advisory/ http://en.securitylab.ru/lab/
