Advisory Details

February 4th, 2021

Siemens Comfort Panel Telnet Service Missing Authentication Remote Code Execution Vulnerability

CVE ID	CVE-2020-15798
CVSS SCORE	9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Siemens
AFFECTED PRODUCTS	Comfort Panel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Siemens Comfort Panel. Authentication is not required to exploit this vulnerability. The specific flaw exists within the telnet service, which listens on TCP port 22 by default. The issue results from the lack of authentication prior to allowing remote connections. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.
ADDITIONAL DETAILS	Siemens has issued an update to correct this vulnerability. More details can be found at: https://us-cert.cisa.gov/ics/advisories/icsa-21-033-02
DISCLOSURE TIMELINE	2020-09-30 - Vulnerability reported to vendor 2021-02-04 - Coordinated public release of advisory
CREDIT	Ta-Lun Yen of TXOne IoT/ICS Security Research Labs (Trend Micro)

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