#VU11605 Improper authentication in Allen-Bradley MicroLogix 1400 - CVE-2017-12088

Vulnerability identifier: #VU11605

Vulnerability risk: Low

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:Clear]

CVE-ID: CVE-2017-12088

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Allen-Bradley MicroLogix 1400
Hardware solutions / Office equipment, IP-phones, print servers

Vendor: Rockwell Automation

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

The weakness exists in the Ethernet functionality due to improper authentication. A remote attacker can submit a specially crafted packet and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Allen-Bradley MicroLogix 1400: B FRN 21.0 - B FRN 21.2

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External links
https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0440
https://ics-cert.us-cert.gov/advisories/ICSA-18-095-01

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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.