#VU53593 Man-in-the-Middle (MitM) attack in Allen-Bradley MicroLogix 1400 and Micro800 - CVE-2021-32926

Vulnerability identifier: #VU53593

Vulnerability risk: Medium

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-32926

CWE-ID: CWE-300

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Allen-Bradley MicroLogix 1400
Hardware solutions / Office equipment, IP-phones, print servers
Micro800
Hardware solutions / Firmware

Vendor: Rockwell Automation

Description

The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to an issue when an authenticated password change request takes place. A remote attacker can intercept the message that includes the legitimate, new password hash and replace it with an illegitimate hash, leading to denial of service (DoS) condition.

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

Vulnerable software versions

Allen-Bradley MicroLogix 1400: 21

Micro800: All versions

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External links
https://ics-cert.us-cert.gov/advisories/icsa-21-145-02

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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.