#VU56640 OS Command Injection in Siemens products - CVE-2021-31891

Vulnerability identifier: #VU56640

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-31891

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Desigo CC
Server applications / SCADA systems
GMA-Manager
Server applications / SCADA systems
Operation Scheduler
Server applications / SCADA systems
Siveillance Control
Server applications / SCADA systems
Siveillance Control Pro
Server applications / SCADA systems
Siveillance OIS
Server applications / SCADA systems

Vendor: Siemens

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote unauthenticated attacker can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Desigo CC: All versions

GMA-Manager: All versions

Operation Scheduler: All versions

Siveillance Control: All versions

Siveillance Control Pro: All versions

Siveillance OIS: before 2.5.3

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-535380.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.