Missing Authentication for Critical Function in Siemens SINAMICS Medium Voltage Products



Published: 2021-05-13
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-31337
CWE ID CWE-306
Exploitation vector Network
Public exploit N/A
Vulnerable software
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SINAMICS SL150
Hardware solutions / Firmware

SINAMICS SM150
Hardware solutions / Firmware

SINAMICS SM150i
Hardware solutions / Firmware

SIMATIC HMI KTP Mobile Panels
Server applications / SCADA systems

SIMATIC HMI Comfort Panels
Server applications / SCADA systems

Vendor Siemens

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Missing Authentication for Critical Function

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-31337

CWE-ID: CWE-306 - Missing Authentication for Critical Function

Exploit availability: No

Description

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

The vulnerability exists due to the Telnet service of the SIMATIC HMI Comfort Panels system component does not require authentication. A remote attacker can gain access to the device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SINAMICS SL150: All versions

SINAMICS SM150: All versions

SINAMICS SM150i: All versions

SIMATIC HMI KTP Mobile Panels: before v16 Update 3a

SIMATIC HMI Comfort Panels: before v16 Update 3a

CPE External links

https://ics-cert.us-cert.gov/advisories/icsa-21-131-04
https://cert-portal.siemens.com/productcert/pdf/ssa-752103.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-520004.pdf

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.



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