Denial of service in Rockwell Automation Micro800 and MicroLogix 1400

1) Man-in-the-Middle (MitM) attack

EUVDB-ID: #VU53593

Risk: Medium

CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-32926

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

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

External links

http://ics-cert.us-cert.gov/advisories/icsa-21-145-02

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

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

Is there known malware, which exploits this vulnerability?

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