Infinite loop in Rockwell Automation products - CVE-2020-6998

Vulnerability identifier: #VU51180

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-6998

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to the connection establishment algorithm does not sufficiently manage its control flow during execution. A remote attacker can send a specially crafted CIP packet and cause denial of service conditions.

Allen-Bradley Armor Compact GuardLogix 5370
Armor GuardLogix Safety Controllers
Allen-Bradley CompactLogix 5370 L1
Allen-Bradley CompactLogix 5370 L2
Allen-Bradley CompactLogix 5370 L3
Allen-Bradley Compact GuardLogix 5370
ControlLogix 5570 controllers

Install update from vendor's website.

Allen-Bradley Armor Compact GuardLogix 5370 - update to 33.011
Armor GuardLogix Safety Controllers - update to 33.011
Allen-Bradley CompactLogix 5370 L1 - update to 33.011
Allen-Bradley CompactLogix 5370 L2 - update to 33.011
Allen-Bradley CompactLogix 5370 L3 - update to 33.011
Allen-Bradley Compact GuardLogix 5370 - update to 33.011
ControlLogix 5570 controllers - update to 33.011

• https://ics-cert.us-cert.gov/advisories/icsa-21-061-02

• Denial of service in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 Controllers