Improper Authorization in Siemens products - CVE-2020-28397

Vulnerability identifier: #VU55778

CSH Severity: Medium

CVSS v4: 6.9 [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]

CVE-ID: CVE-2020-28397

CWE-ID: CWE-285

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

SIMATIC ET 200SP Open Controller CPU 1515SP PC2
SIMATIC S7-PLCSIM Advanced
SIMATIC S7-1500 Software Controller
SIMATIC S7-1500 CPU
TIM 1531 IRC
SIMATIC S7-1200 CPU family
SIMATIC Drive Controller

Install updates from vendor's website.

SIMATIC S7-PLCSIM Advanced - update to 4.0
SIMATIC S7-1500 CPU - update to 2.9.2
TIM 1531 IRC - update to 2.2
SIMATIC S7-1200 CPU family - update to 4.4.1
SIMATIC Drive Controller - update to 2.9.2

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

• Improper Authorization in Siemens Industrial products