Denial of service in Rockwell Automation Allen-Bradley CompactLogix and Compact GuardLogix

1) Improper input validation

EUVDB-ID: #VU13420

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-9312

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when processing malicious input. A remote attacker can send a specific TCP packet to the product and cause a Major Non-Recoverable Fault (MNRF) and service crash.

Mitigation

Update to version 31.011.

Vulnerable software versions

Allen-Bradley Armor Compact GuardLogix 5370: before 31.011

Allen-Bradley Compact GuardLogix 5370: before 31.011

Allen-Bradley Armor CompactLogix 5370 L3: before 31.011

Allen-Bradley CompactLogix 5370 L3: before 31.011

Allen-Bradley CompactLogix 5370 L2: before 31.011

Allen-Bradley CompactLogix 5370 L1: before 31.011

External links

http://ics-cert.us-cert.gov/advisories/ICSA-18-172-02

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.