Vulnerability identifier: #VU54870

Vulnerability risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31894

CWE-ID: CWE-732

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
SIMATIC PCS 7
Server applications / SCADA systems
SIMATIC PDM
Server applications / SCADA systems
SIMATIC STEP 7
Server applications / SCADA systems
SINAMICS STARTER
Other software / Other software solutions

Vendor: Siemens

Description

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to incorrect permission assignment for critical resource. A local user can change the content of certain metafiles and subsequently manipulate parameters or the behavior of devices that would be later configured by the affected software.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC PCS 7: 8.2 - 9.0

SIMATIC PDM: All versions

SINAMICS STARTER: All versions

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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