Denial of service in FactoryTalk Services Platform

1) Input validation error

EUVDB-ID: #VU49159

Risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-5807

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. An unauthenticated remote attacker can send data to RsvcHost.exe listening on TCP port 5241 to add entries in the FactoryTalk Diagnostics event log. A local user can use the FactoryTalk Diagnostics Viewer (FTDiagViewer.exe) to view the log. The attacker can specify long fields in the log entry, which can cause an unhandled exception by wcscpy_s() in FTDiagnosticsViewer.dll loaded in FTDiagViewer.exe, resulting in process termination.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

FactoryTalk Services Platform: 6.11.00 - 6.20

External links

http://www.tenable.com/security/research/tra-2020-71
http://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129496/redirect
http://ics-cert.us-cert.gov/advisories/icsa-21-028-01

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.