Improper access control in Siemens SIMATIC STEP 7 (TIA Portal)

1) Improper access control

EUVDB-ID: #VU62478

Risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-42029

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a local user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the engineering system software. A local administrator can bypass implemented security restrictions and gain elevated privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC STEP 7 (TIA Portal): 15.0 - 17

External links

http://cert-portal.siemens.com/productcert/pdf/ssa-350757.pdf

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.

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.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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