Vulnerability identifier: #VU7185

Vulnerability risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6868

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC CP 44x-1 RNA
Server applications / SCADA systems

Vendor: Siemens

Description
The vulnerability allows a remote unauthenticated attacker to bypass authentication on the target system.

The weakness exists in Siemens SIMATIC Communication Processor (CP) 44x-1 Redundant Network Access (RNA) modules due to
improper authentication restrictions. A remote attacker can connect to a targeted system via TCP port 102 and gain administrative control over the system.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 1.4.1.

Vulnerable software versions

SIMATIC CP 44x-1 RNA: 1.4.0

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External links
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-126840.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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