#VU51180 Infinite loop in Rockwell Automation products - CVE-2020-6998

Vulnerability identifier: #VU51180

Vulnerability risk: Medium

CVSSv4.0: 2.7 [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/E:U/U:Green]

CVE-ID: CVE-2020-6998

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Allen-Bradley Armor Compact GuardLogix 5370
Hardware solutions / Firmware
Armor GuardLogix Safety Controllers
Hardware solutions / Firmware
Allen-Bradley CompactLogix 5370 L1
Hardware solutions / Firmware
Allen-Bradley CompactLogix 5370 L2
Hardware solutions / Firmware
Allen-Bradley CompactLogix 5370 L3
Hardware solutions / Firmware
Allen-Bradley Compact GuardLogix 5370
Hardware solutions / Firmware
ControlLogix 5570 controllers
Hardware solutions / Firmware

Vendor: Rockwell Automation

Description

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Allen-Bradley Armor Compact GuardLogix 5370: 33

Armor GuardLogix Safety Controllers: 33

Allen-Bradley CompactLogix 5370 L1: 33

Allen-Bradley CompactLogix 5370 L2: 33

Allen-Bradley CompactLogix 5370 L3: 33

Allen-Bradley Compact GuardLogix 5370: 33

ControlLogix 5570 controllers: 33

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

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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.