Main Vulnerability Database Vulnerabilities #VU6699

Authentication bypass in Allen-Bradley MicroLogix 1100 and Allen-Bradley MicroLogix 1400 - CVE-2017-7903

Published: May 24, 2017

Vulnerability identifier: #VU6699

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-7903

CWE-ID: CWE-521

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform brute-force attack.

The vulnerability exists due to weak password requirements. A remote attacker can brute-force account passwords and bypass authentication on the system.

Successful exploitation of the vulnerability may result in unauthorized access to vulnerable system.

Affected software

Allen-Bradley MicroLogix 1100
Allen-Bradley MicroLogix 1400

How to mitigate CVE-2017-7903

Update to version 21.00

External References

https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04

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