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Vulnerability of SIMATIC WinCC, PCS 7: out-of-bounds memory reading via ActiveX

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 software: SIMATIC.
Severity of this computer vulnerability: 2/4.
Creation date: 09/12/2016.
Références of this announce: CERTFR-2016-AVI-405, CVE-2016-9160, SSA-693129, VIGILANCE-VUL-21346.

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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This weakness note impacts software or systems such as SIMATIC.

Our Vigil@nce team determined that the severity of this threat note is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer weakness.

Solutions for this threat 

SIMATIC WinCC, PCS 7: fixed versions for ActiveX.
Fixed versions are indicated in information sources.
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