Vigil@nce - SIMATIC WinCC, PCS 7: out-of-bounds memory reading via ActiveX
February 2017 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can force a read at an invalid address via ActiveX of
SIMATIC WinCC, in order to trigger a denial of service, or to
obtain sensitive information.
Impacted products: SIMATIC.
Severity: 2/4.
Creation date: 09/12/2016.
DESCRIPTION OF THE VULNERABILITY
The SIMATIC WinCC product, included in PCS 7, offers a web service.
However, it tries to read a memory area located outside the
expected range, which triggers a fatal error, or leads to the
disclosure of a memory fragment.
An attacker can therefore force a read at an invalid address via
ActiveX of SIMATIC WinCC, in order to trigger a denial of service,
or to obtain sensitive information.
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