Improper Authorization in Siemens Industrial products

1) Improper Authorization

EUVDB-ID: #VU55778

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28397

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to insufficient authorization checks. A remote attacker can read PLC variables from the affected devices.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC ET 200SP Open Controller CPU 1515SP PC2: All versions

SIMATIC S7-PLCSIM Advanced: 2.0

SIMATIC S7-1200 CPU family: 4.4

SIMATIC S7-1500 CPU: 2.5

SIMATIC S7-1500 Software Controller: 2.5

TIM 1531 IRC: 2.1

SIMATIC Drive Controller: before 2.9.2

External links

http://cert-portal.siemens.com/productcert/pdf/ssa-865327.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.