Rockwell Automation MicroLogix 1100 PLC < FRN 10.0 Authentication Mechanism DoS

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 denial of service vulnerability in the web server's password
mechanism.

Description :

The Rockwell Automation MicroLogix 1100 PLC integrated web server is
a firmware version that is prior to FRN 10.0. It is, therefore,
affected by a denial of service vulnerability due to a failure of the
authentication mechanism to properly handle remote connections or
commands. A remote attacker can exploit this, using a crafted request,
to cause the product to enter a predefined fault mode, resulting in
the device being reset to a factory-default state.

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

See also :

http://www.nessus.org/u?e156598d

Solution :

Upgrade to MicroLogix 1100 PLC firmware release version FRN 10.0 or
later.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)

Family: SCADA

Nessus Plugin ID: 84570 ()

Bugtraq ID: 37827

CVE ID: CVE-2009-3739

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