Missing Authentication for Critical Function in Siemens LOGO!8 BM

1) Missing Authentication for Critical Function

EUVDB-ID: #VU28932

Risk: High

CVSSv4.0: 8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-7589

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication checks.

The vulneability exists due to the affected product is missing authentication in the TDE service functionality in "NFSAccess" and "DELETEPROG" functions. A remote attacker with access to Port 135/TCP can read and modify the device configuration and obtain project files from the devices. 

Mitigation

Install updates from vendor's website.

Vulnerable software versions

LOGO!8 BM: All versions

CPE2.3

• cpe:2.3:h:siemens:logo_8_bm:*:*:*:*:*:*:*:*

External links

https://ics-cert.us-cert.gov/advisories/icsa-20-161-03
https://cert-portal.siemens.com/productcert/pdf/ssa-817401.pdf
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1026
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1025
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1024

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.