#VU55778 Improper Authorization in Siemens products - CVE-2020-28397

Vulnerability identifier: #VU55778

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28397

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC ET 200SP Open Controller CPU 1515SP PC2
Server applications / SCADA systems
SIMATIC S7-PLCSIM Advanced
Server applications / SCADA systems
SIMATIC S7-1500 Software Controller
Server applications / SCADA systems
SIMATIC S7-1200 CPU family
Hardware solutions / Firmware
SIMATIC S7-1500 CPU
Hardware solutions / Firmware
TIM 1531 IRC
Hardware solutions / Firmware
SIMATIC Drive Controller
Hardware solutions / Firmware

Vendor: Siemens

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

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-865327.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.