Authentication bypass in Siemens SIMATIC CP 44x-1 RNA

1) Authentication bypass

EUVDB-ID: #VU7185

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 - Improper Authentication

Exploit availability: No

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

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