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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT Security Bulletin ASB-2013.0043 SSA-714398: Vulnerabilities in WinCC 7.0 SP3 Update 1 20 March 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens WinCC & SIMATIC PCS7 Operating System: Windows Server 2003 Windows Server 2008 Windows Server 2008 R2 Windows 7 Windows XP Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Denial of Service -- Remote with User Interaction Access Confidential Data -- Existing Account Unauthorised Access -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade Member content until: Friday, April 19 2013 OVERVIEW Multiple vulnerabilities have been identified in Siemens SIMATIC WinCC version 7.0 SP3 Update 1 and below. SIMATIC PCS 7 Web Server is also affected by these vulnerabilities. [1] IMPACT The vendor has provided the following description regarding these vulnerabilities: "Vulnerability 1 WebNavigator passwords stored in the SQL database are only obfuscated. CVSS Base Score 2.7 CVSS Temporal Score 2.1 CVSS Overall Score 2.1 (AV:A/AC:L/Au:S/C:P/I:N/A:N/E:POC/RL:OF/RC:C) Vulnerability 2 Users with legitimate, non-privileged access to WinCCs MS SQL database can retrieve obfuscated user passwords for WebNavigator. For doing this, access to the system is needed either locally or from the adjacent network and the users account must have adequate permissions. CVSS Base Score 2.7 CVSS Temporal Score 2.1 CVSS Overall Score 2.1 (AV:A/AC:L/Au:S/C:P/I:N/A:N/E:POC/RL:OF/RC:C) Vulnerability 3 Authenticated users may manipulate the URL in the web browser to access the file system of the web server. With this vulnerability they may read all the files that are readable in the web server context. CVSS Base Score 4.0 CVSS Temporal Score 3.1 CVSS Overall Score 3.1 (AV:N/AC:L/Au:S/C:P/I:N/A:N/E:POC/RL:OF/RC:C) Vulnerability 4 An ActiveX control RegReader which is installed in the users web browser is susceptible to a buffer overflow. An attacker might trick a victim into visiting a malicious web site which calls this ActiveX control, triggers the overflow and take over the victims PC. CVSS Base Score 6.8 CVSS Temporal Score 5.3 CVSS Overall Score 5.3 (AV:N/AC:M/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C) Vulnerability 5 By opening a manipulated project file, sensitive data can be transmitted over the network or a DoS condition can be provoked. CVSS Base Score 5.8 CVSS Temporal Score 4.5 CVSS Overall Score 4.5 (AV:N/AC:M/Au:N/C:P/I:N/A:P/E:POC/RL:OF/RC:C) Vulnerability 6 By sending a specially crafted packet to a dynamically assigned port, an attacker can generate a DoS condition against WinCC. CVSS Base Score 6.1 CVSS Temporal Score 5.0 CVSS Overall Score 5.0 (AV:A/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C)" [1] MITIGATION The vendor recommends updating to WinCC 7.2. [1] REFERENCES [1] SSA-714398: Vulnerabilities in WinCC 7.0 SP3 Update 1 http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-714398.pdf AusCERT has made every effort to ensure that the information contained in this document is accurate. However, the decision to use the information described is the responsibility of each user or organisation. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUUk41O4yVqjM2NGpAQIVGA//fVER0hkBpBxll6fol1R41r3Iz3gWpONP YIiOqljGJgkH2MOSurlEf7jkikfQTOvZG2jlUzSzph7+AOpCu6AU9UC5xXxJJQ+Q HFnAO9Q+d4p8KrSKLOw0/LxKkImcZURTRlrZck+EoyJLEG9xrsLkLAtGHlQoi1vL tYkahLGJGQu0Z+/qrdUjl/LhFhiFaMVgsIUzUXAr50ptpYgfvHhLUUMQy8f69zUg F5gV8cD/KqH/0wbDVqSrMwudOX+BWcFxNwIifawNR9FHqANhpS6TMJetHta9xnxH g7INGU2OxYe9kqljrBbXX92sxucVNcbzyTPkbE4HRkF6lZo9vPLmVBE5jM40iKT7 B6MiQZy26ATclr4KmIRhnMyNO2eXo9TC+8pqGuNH37ud8atX6DWrtvDjNWvHyR+P SjqCW3pAz6KDddxH97n3/Q9MdWV3LfRBz1Yq9DGA0GailsqFVIgqDmIoWyxg9pRs V6y8raa7kqdQc4lwrSQQlU8ne4id5xDPxM2Ah96Dn8uwXJL0cf3wpfy633EoT5FA WnxMPu58eUaSEdcoAE4tbOJCvZ9YuE8IWdMOH7inEZM9B1zJr/AwimQLKzirXojD IjnZQFpb1sBOg/IgEWFGKNCyvNrhoBjwaK361SRyoNIupejYCI1zACU6WwFnuAKe IG1M0QEc2u8= =jjgu -----END PGP SIGNATURE-----