Missing Authentication for Critical Function in Siemens products - CVE-2020-15798

Vulnerability identifier: #VU50271

CSH Severity: High

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

CVE-ID: CVE-2020-15798

CWE-ID: CWE-306

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Siemens

Affected software:
SINAMICS SM150i
SINAMICS SM150
SINAMICS SM120
SINAMICS SL150
SINAMICS SH150
SINAMICS GM150
SINAMICS GL150
SINAMICS GH150
SIMATIC HMI Comfort Panels
SIMATIC HMI KTP Mobile Panels

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the affected devices with enabled Telnet service do not require authentication for this service. A remote attacker can gain full access to the device.

Install updates from vendor's website.

• https://ics-cert.us-cert.gov/advisories/icsa-21-033-02
• https://cert-portal.siemens.com/productcert/pdf/ssa-520004.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-752103.pdf