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

1) Improper input validation

EUVDB-ID: #VU13420

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

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

CPE2.3

• cpe:2.3:h:rockwell_automation:allen-bradley_armor_compact_guardlogix_5370:*:*:*:*:*:*:*:*
• cpe:2.3:h:rockwell_automation:allen-bradley_compact_guardlogix_5370:*:*:*:*:*:*:*:*
• cpe:2.3:h:rockwell_automation:allen-bradley_armor_compactlogix_5370_l3:*:*:*:*:*:*:*:*
• cpe:2.3:h:rockwell_automation:allen-bradley_compactlogix_5370_l3:*:*:*:*:*:*:*:*
• cpe:2.3:h:rockwell_automation:allen-bradley_compactlogix_5370_l2:*:*:*:*:*:*:*:*
• cpe:2.3:h:rockwell_automation:allen-bradley_compactlogix_5370_l1:*:*:*:*:*:*:*:*

External links

https://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.