Vulnerability identifier: #VU9110

Vulnerability risk: Low

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-14023

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC PCS 7
Server applications / SCADA systems

Vendor: Siemens

Description
The vulnerability allows a remote authenticated attacker in the 'administrators' group to cause DoS condition on the target system.

The weakness exists due to improper input validation. A remote attacker can send specially crafted data to the target DCOM interface and cause the target service to crash.

Mitigation
Install update from vendor's website (V8.1 SP1 with WinCC V7.3 Upd 13).

Vulnerable software versions

SIMATIC PCS 7: 8.1 - 8.2

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External links
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-523365.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.