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

1) Infinite loop

EUVDB-ID: #VU51180

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6998

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

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

External links

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

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.