Allen-Bradley MicroLogix 1400 Multiple Vulnerabilities

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Allen-Bradley MicroLogix 1400 controller is affected by
multiple vulnerabilities.

Description :

The installed firmware on the remote Allen-Bradley MicroLogix 1400
controller is affected by multiple vulnerabilities :

- A flaw exists when handling messages that modify
specific bits in status files. An unauthenticated,
remote attacker can exploit this, via a specially
crafted message, to cause a denial of service
condition. (CVE-2012-4690)

- A flaw exists in the Ethernet/IP protocol implementation
when handling a CIP message that specifies a
logic-execution 'stop' command. An unauthenticated,
remote attacker can exploit this, via a specially
crafted message, to cause a denial of service condition.
(CVE-2012-6435)

- A buffer overflow condition exists due to improper
validation of user-supplied input when parsing CIP
packets. An unauthenticated, remote attacker can exploit
this, via a malformed packet, to cause a denial of
service condition. (CVE-2012-6436, CVE-2012-6438)

- A flaw exists due to a failure to properly authenticate
Ethernet firmware updates. An unauthenticated, remote
attacker can exploit this, via a trojan horse update
image, to execute arbitrary code. (CVE-2012-6437)

- A flaw exists when handling CIP messages that modify
network and configuration parameters. An
unauthenticated, remote attacker can exploit this, via a
specially crafted message, to cause a denial of service
condition. (CVE-2012-6439)

- A flaw exists due to a failure to properly restrict
session replaying. A man-in-the-middle attacker can
exploit this, via HTTP traffic, to conduct a replay
attack. (CVE-2012-6440)

- An information disclosure vulnerability exists in the
Ethernet/IP protocol implementation when handling the
'dump' command. An unauthenticated, remote attacker
can exploit this, via a specially crafted CIP packet,
to disclose the boot code of the device. (CVE-2012-6441)

- A flaw exists in the Ethernet/IP protocol implementation
when handling a CIP message that specifies a 'reset'
command. An unauthenticated, remote attacker can exploit
this, via a specially crafted message, to cause a denial
of service condition. (CVE-2012-6442)

Note that Nessus has not tested for these issues but has instead
relied only on the firmware's self-reported version number.

See also :

https://ics-cert.us-cert.gov/advisories/ICSA-13-011-03
https://ics-cert.us-cert.gov/advisories/ICSA-12-342-01B
https://ics-cert.us-cert.gov/alerts/ICS-ALERT-12-020-02A
http://rockwellautomation.custhelp.com/app/answers/detail/a_id/470154
http://rockwellautomation.custhelp.com/app/answers/detail/a_id/470155
http://rockwellautomation.custhelp.com/app/answers/detail/a_id/470156
http://rockwellautomation.custhelp.com/app/answers/detail/a_id/54102

Solution :

Upgrade to the latest firmware version, or if not possible, apply the
mitigation steps that are recommended by the vendor.

Risk factor :

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

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