Denial of service in Siemens SIMATIC PCS 7

1) Denial of service

EUVDB-ID: #VU9110

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 - Improper input validation

Exploit availability: No

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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