#VU54183 Improper Authentication in CLICK PLC CPU Module C0-1x CPUs - CVE-2021-32984

Vulnerability identifier: #VU54183

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-32984

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
CLICK PLC CPU Module C0-1x CPUs
Hardware solutions / Firmware

Vendor: AutomationDirect

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to all programming connections receive the same unlocked privileges. A remote attacker can connect to the PLC and read the project without authorization, during the time the PLC is unlocked by an authorized user.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

CLICK PLC CPU Module C0-1x CPUs: before 3.00

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External links
https://ics-cert.us-cert.gov/advisories/icsa-21-166-02

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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.