Hidden functionality in Schneider Electric Triconex TriStation

1) Hidden functionality

EUVDB-ID: #VU31812

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-7485

CWE-ID: CWE-912 - Hidden Functionality (Backdoor)

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system

The vulnerability exists due to hidden functionality (backdoor) is present in software, related to a legacy support account. A local user can use this functionality to inappropriate access to the TriStation 1131 project file.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Triconex TriStation 1131: 4.9.0 - 4.10.0

External links

http://www.se.com/ww/en/download/document/SESB-2020-105-01

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.