Rockwell Automation MicroLogix 1100 PLC < Series B FRN 12.0 MitM Replay Authentication Bypass

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.

Synopsis :

The remote web server running on the MicroLogix 1100 PLC is affected
by an authentication bypass vulnerability.

Description :

The Rockwell Automation MicroLogix 1100 PLC integrated web server has
a firmware version that is prior to Series B FRN 12.0. It is,
therefore, affected by an authentication bypass vulnerability due to a
failure to properly restrict session replays. A man-in-the-middle
attacker via HTTP traffic can use a session replay attack to bypass
the web server's authentication mechanism.

Note that Nessus has not attempted to exploit this issue but has
instead relied only on the self-reported version number.

See also :

Solution :

Upgrade to MicroLogix 1100 PLC firmware release version Series B FRN
12.0 or later.

Risk factor :

High / CVSS Base Score : 9.3

Family: SCADA

Nessus Plugin ID: 84568 ()

Bugtraq ID: 57315

CVE ID: CVE-2012-6440

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