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AUSCERT Security Bulletin
ASB-2013.0090
SSA-064884: Vulnerabilities in WinCC (TIA Portal)
1 August 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens WinCC (TIA Portal)
Operating System: Windows Server 2003
Windows Server 2008
Windows Server 2008 R2
Windows 7
Windows XP
Impact/Access: Cross-site Request Forgery -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2013-4912 CVE-2013-4911
Member content until: Saturday, August 31 2013
OVERVIEW
Multiple vulnerabilities have been identified in Siemens SIMATIC WinCC
(TIA Portal) v11 and v12. [1]
IMPACT
The vendor has provided the following description regarding these
vulnerabilities:
"Vulnerability 1 (CVE-2013-4911)
The web server of the affected HMI panels may allow CSRF (Cross-site
request forgery) attacks, compromising integrity and availability of
the system.
CVSS Base Score 5.8
CVSS Temporal Score 4.5
CVSS Overall Score 4.5
(AV:N/AC:M/Au:N/C:N/I:P/A:P/E:POC/RL:OF/RC:C)
Vulnerability 2 (CVE-2013-4912)
The web server of the affected HMI panels may allow URL redirection to
untrusted websites.
CVSS Base Score 4.3
CVSS Temporal Score 3.4
CVSS Overall Score 3.4
(AV:N/AC:M/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C)" [1]
MITIGATION
The vendor has given the following solution:
"Siemens provides software update WinCC (TIA Portal) V12 SP1 which
fixes both vulnerabilities. WinCC (TIA Portal) V11 users should also
upgrade to this software version.
After installing the software update, upgrade the device firmware by
using the function 'Change Device/Version' in the user interface." [1]
REFERENCES
[1] SSA-064884: Vulnerabilities in WinCC (TIA Portal)
http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-064884.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.
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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.
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