Siemens Mitigates SIMATIC WinCC Add-On

Monday, January 22, 2018 @ 10:01 AM gHale


Siemens released a mitigation plan to fix stack-based buffer overflow and input validation vulnerabilities in its SIMATIC WinCC Add-On, according to a report with ICS-CERT.

Successful exploitation of these remotely exploitable vulnerabilities, discovered by Sergey Temnikov and Vladimir Dashchenko from Kaspersky Lab, could allow remote code execution or a denial of service condition.

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Siemens said the vulnerabilities affect the following versions of SIMATIC WinCC Add-On:
• SIMATIC WinCC Add-On Historian CONNECT ALARM all versions prior to and including v5.x
• SIMATIC WinCC Add-On PI CONNECT ALARM all versions prior to and including v2.x
• SIMATIC WinCC Add-On PI CONNECT AUDIT TRAIL all versions prior to and including v1.x
• SIMATIC WinCC Add-On PM-AGENT all versions prior to and including v5.x
• SIMATIC WinCC Add-On PM-ANALYZE all versions prior to and including v7.x
• SIMATIC WinCC Add-On PM-CONTROL all versions prior to and including v10.x
• SIMATIC WinCC Add-On PM-MAINT all versions prior to and including v9.x
• SIMATIC WinCC Add-On PM-OPEN EXPORT all versions prior to and including v7.x
• SIMATIC WinCC Add-On PM-OPEN HOST-S all versions prior to and including v7.x
• SIMATIC WinCC Add-On PM-OPEN IMPORT all versions prior to and including v6.x
• SIMATIC WinCC Add-On PM-OPEN PI all versions prior to and including v7.x
• SIMATIC WinCC Add-On PM-OPEN PV02 all versions prior to and including v1.x
• SIMATIC WinCC Add-On PM-OPEN TCP/IP all versions prior to and including v8.x
• SIMATIC WinCC Add-On PM-QUALITY all versions prior to and including v9.x
• SIMATIC WinCC Add-On SICEMENT IT MIS all versions prior to and including v7.x
• SIMATIC WinCC Add-On SIPAPER IT MIS all versions prior to and including v7.x

No known public exploits specifically target these vulnerabilities. However, an attacker with low skill level could leverage the vulnerabilities.

Malformed ASN1 streams in V2C and similar input files can be used to generate stack-based buffer overflows. The vulnerability could allow arbitrary code execution.

CVE-2017-11496 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 9.8.

In addition, language packs containing malformed filenames could lead to a stack-based buffer overflow. The vulnerability could allow arbitrary code execution.

CVE-2017-11497 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 9.8.

Also, language pack (ZIP file) with invalid HTML files could lead to NULL pointer access. The vulnerability could cause denial of service of the remote process.

CVE-2017-11498 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 7.5.

The products see action mainly in the chemical, energy, food and agriculture and water and wastewater systems sectors. They also see use on a global basis.

Gemalto released an updated installer and Siemens strongly encourages users upgrade to the new installer as soon as possible. Click here to download the new installer.

Siemens also advises that users configure the operational environment according to Siemens’ Operational Guidelines for Industrial Security.

For more information on these vulnerabilities and more detailed mitigation instructions, click on Siemens Security Advisory SSA-127490.



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