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Cisco Security Advisory: Multiple Vulnerabilities in Cisco Wireless LAN Controllers
From: Cisco Systems Product Security Incident Response Team <psirt () cisco com>
Date: Wed, 08 Sep 2010 11:30:00 -0400

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Cisco Security Advisory: Multiple Vulnerabilities in Cisco Wireless
LAN Controllers

Advisory ID: cisco-sa-20100908-wlc

Revision 1.0

For Public Release 2010 September 08 1600 UTC (GMT)

+---------------------------------------------------------------------

Summary
=======

The Cisco Wireless LAN Controller (WLC) product family is affected by
these vulnerabilities:

  * Two denial of service (DoS) vulnerabilities
  * Three privilege escalation vulnerabilities
  * Two access control list (ACL) bypass vulnerabilities

Note: These vulnerabilities are independent of one another. A device
may be affected by one vulnerability and not affected by another.

Cisco has released free software updates that address these
vulnerabilities.

There are no workarounds to mitigate these vulnerabilities.

This advisory is posted at:

http://www.cisco.com/warp/public/707/cisco-sa-20100908-wlc.shtml

Affected Products
=================

Vulnerable Products
+------------------

These products are each affected by at least one vulnerability
covered in this Security Advisory:

  * Cisco 2000 Series WLCs
  * Cisco 2100 Series WLCs
  * Cisco 4100 Series WLCs
  * Cisco 4400 Series WLCs
  * Cisco 5500 Series WLCs
  * Cisco Wireless Services Modules (WiSMs)
  * Cisco WLC Modules for Integrated Services Routers (ISRs)
  * Cisco Catalyst 3750G Integrated WLCs
   
DoS Vulnerabilities
~~~~~~~~~~~~~~~~~~~

The Cisco WLC product family is affected by two DoS vulnerabilities:

  * Internet Key Exchange (IKE) DoS Vulnerability
  * HTTP DoS Vulnerability

The IKE DoS vulnerability affects Cisco WLC software versions 3.2 and
later. The HTTP DoS vulnerability affects Cisco WLC software versions
4.2 and later.

Privilege Escalation Vulnerabilities
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The privilege escalation vulnerabilities affect Cisco WLC software
versions 4.2 and later.

CPU ACL Bypass Vulnerabilities
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

One of the two ACL bypass vulnerabilities affects Cisco WLC software
versions 4.1 and later. The second ACL bypass vulnerability affects
Cisco WLC software versions 6.0.x.

Determination of Software Versions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Administrators can use these instructions to determine the software
version that is running on the Cisco WLCs (using the web or
command-line interface) or on the Cisco WiSM (using commands on the
Cisco Catalyst 6500 Series Switch and Cisco 7600 Series Router).

Cisco Wireless Controllers
~~~~~~~~~~~~~~~~~~~~~~~~~~

To determine the WLC version that is running in a given environment,
use one of these methods:

  * In the web interface, choose the "Monitor" tab, click "Summary" in
    the left pane, and note the "Software" Version field.

Note: Customers who use a Cisco WLC Module in an ISR will need to
issue the "service-module wlan-controller <slot/port> session" command
prior to performing the next step on the command line. Customers who
use a Cisco Catalyst 3750G Switch with an integrated WLC Module will
need to issue the "session <Stack-Member-Number> processor 1 session"
command prior to performing the next step on the command line.

  * From the command-line interface, type "show sysinfo" and note the 
    "Product Version" field, as shown in this example:
   
        (Cisco Controller)> show sysinfo
        
        Manufacturer's Name.. Cisco Systems Inc.
        Product Name......... Cisco Controller
        Product Version...... 5.1.151.0
        RTOS Version......... Linux-2.6.10_mvl401
        Bootloader Version... 4.0.207.0
        Build Type........... DATA + WPS
        <output suppressed>
   
Cisco WiSMs
~~~~~~~~~~~

Use the "show wism module <module number> controller 1 status" command
on a Cisco Catalyst 6500 Series Switch and Cisco 7600 Series Router
if they are using a WiSM. Note the software version as demonstrated
in this example, which shows version 5.1.151.0:

    Router# show wism module 3 controller 1 status
    
    WiSM Controller 1 in Slot 3
    Operational Status of the Controller    
       : Oper-Up
    Service VLAN                            
       : 192   
    Service Port                            
       : 10    
    Service Port Mac Address                
       : 0011.92ff.8742
    Service IP Address                      
       : 192.168.10.1
    Management IP Address                   
       : 192.168.1.123
    Software Version                        
       : 5.1.151.0
    Port Channel Number                     
       : 288   
    Allowed vlan list                       
       : 30,40 
    Native VLAN ID                          
       : 40    
    WCP Keep Alive Missed                   
       : 0

Products Confirmed Not Vulnerable
+--------------------------------

No other Cisco products are currently known to be affected by these
vulnerabilities.

Details
=======

Cisco WLCs and Cisco WiSMs are responsible for system-wide wireless
LAN functions, such as security policies, intrusion prevention, RF
management, quality of service (QoS), and mobility.

These devices communicate with controller-based access points over
any Layer 2 (Ethernet) or Layer 3 (IP) infrastructure using the
Lightweight Access Point Protocol (LWAPP) and the Control and
Provisioning of Wireless Access Points (CAPWAP) protocol.

The Cisco WLC family of devices is affected by 2 denial of service
vulnerabilities, 3 privilege escalation vulnerabilities, and 2 access
control list bypass vulnerabilities. The following are the details
about these vulnerabilities.

IKE Denial of Service Vulnerability
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

An attacker with the ability to send a malicious IKE packet to an
affected Cisco WLC could cause the device to crash and reload. This
vulnerability can be exploited from both wired and wireless segments.

Note: IKE is enabled by default in the WLC and cannot be disabled.
Only traffic destined to the Cisco WLC could trigger this
vulnerability. Transient traffic will not trigger this vulnerability.

This vulnerability is documented in Cisco Bug ID CSCta56653 and has
been assigned Common Vulnerabilities and Exposures (CVE) ID
CVE-2010-0574.

HTTP Denial of Service Vulnerability
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

An authenticated attacker with the ability to send a series of
malicious HTTP packets to an affected Cisco WLC could cause the
device to reload. This vulnerability can be exploited from both wired
and wireless segments. A TCP three-way handshake is needed in order
to exploit this vulnerability.

Note: Only traffic destined to the Cisco WLC could trigger this
vulnerability. Transient traffic will not trigger this vulnerability.
WebAuth or guest access is not affected by this vulnerability.

This vulnerability is documented in Cisco Bug ID CSCtd16938
and has been assigned CVE ID CVE-2010-2841.

Privilege Escalation Vulnerabilities
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Three privilege escalation vulnerabilities exist in the Cisco WLCs
that could allow an authenticated attacker with read-only privileges
to modify the device configuration.

These vulnerabilities are documented in Cisco Bug IDs CSCtc91431,
CSCsz66726, and CSCtc93837; and have been assigned
CVE IDs CVE-2010-2842, CVE-2010-2843, and CVE-2010-3033.

Access Control List Bypass Vulnerabilities
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

ACLs can be configured in the Cisco WLCs and applied to data traffic
to and from wireless clients or to all traffic that is destined for
the controller CPU. After ACLs are defined, they can be applied to
the management interface, the access point manager (AP-manager)
interface, or any of the dynamic interfaces for client data traffic
or to the Network Processing Unit (NPU) interface for traffic to the
controller CPU. Two vulnerabilities exist in the Cisco WLCs that
could allow an unauthenticated attacker to bypass policies that
should be enforced by CPU-based ACLs. No other ACL types are affected
by these vulnerabilities.

Note: CPU-based ACLs are configured and applied by navigating to 
Security > Access Control Lists > CPU Access Control Lists in the
Cisco WLC web management interface. When CPU-based ACLs are enabled,
they are applicable to both wireless and wired traffic.

These vulnerabilities are documented in Cisco Bug IDs CSCta66931,
and CSCtf36051; and have been assigned CVE IDs CVE-2010-0575 and
CVE-2010-3034.

Vulnerability Scoring Details
=============================

Cisco has provided scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this Security Advisory is done in accordance with CVSS
version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding
CVSS at:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at:

http://intellishield.cisco.com/security/alertmanager/cvss

CSCta56653 - WLC may reload when receiving crafted IKE packets

CVSS Base Score - 7.8

Access Vector           - Network
Access Complexity       - Low
Authentication          - None
Confidentiality Impact  - None
Integrity Impact        - None
Availability Impact     - Complete

CVSS Temporal Score - 6.4

Exploitability          - Functional
Remediation Level       - Official-Fix
Report Confidence       - Confirmed

CSCtd16938 - WLC crash after passing invalid arguments to emweb

CVSS Base Score - 6.8

Access Vector           - Network
Access Complexity       - Low
Authentication          - Single
Confidentiality Impact  - None
Integrity Impact        - None
Availability Impact     - Complete

CVSS Temporal Score - 5.6

Exploitability          - Functional
Remediation Level       - Official-Fix
Report Confidence       - Confirmed

CSCtc91431, CSCsz66726, and CSCtc93837- Privilege Escalation vulnerabilities

CVSS Base Score - 9.0

Access Vector           - Network
Access Complexity       - Low
Authentication          - Single
Confidentiality Impact  - Complete
Integrity Impact        - Complete
Availability Impact     - Complete

CVSS Temporal Score - 7.8

Exploitability          - Functional
Remediation Level       - Official-Fix
Report Confidence       - Confirmed

CSCta66931, CSCtf36051 - CPU ACL bypass vulnerabilities

CVSS Base Score - 5.0

Access Vector           - Network
Access Complexity       - Low
Authentication          - None
Confidentiality Impact  - Partial
Integrity Impact        - None
Availability Impact     - None

CVSS Temporal Score - 4.1

Exploitability          - Functional
Remediation Level       - Official-Fix
Report Confidence       - Confirmed

Impact
======

Successful exploitation of the DoS vulnerabilities could cause an
affected device to reload. Repeated exploitation could result in a
sustained DoS condition.

Successful exploitation of the privilege escalation vulnerabilities
could allow an authenticated attacker with read-only privileges to
modify the device configuration.

Successful exploitation of the ACL bypass vulnerabilities could allow
an attacker to bypass policies that should be enforced by CPU-based
ACLs.

Software Versions and Fixes
===========================

When considering software upgrades, also consult:

http://www.cisco.com/go/psirt

and any subsequent advisories to determine exposure and a complete
upgrade solution.

In all cases, customers should exercise caution to be certain the
devices to be upgraded contain sufficient memory and that current
hardware and software configurations will continue to be supported
properly by the new release. If the information is not clear, contact
the Cisco Technical Assistance Center (TAC) or your contracted
maintenance provider for assistance.

If a given release train is vulnerable, then the earliest possible
releases that contain the fix (along with the anticipated date of
availability for each, if applicable) are listed in the "First Fixed
Release" column of the table. A device running a release in the given
train that is earlier than the release in a specific column (less
than the First Fixed Release) is known to be vulnerable.

+-------------------------------------------------------------------+
| Vulnerability/Bug ID                   | Affected | First Fixed   |
|                                        | Release  | Version       |
|----------------------------------------+----------+---------------|
|                                        | 3.2      | 3.2.215.0     |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 4.1      | Migrate to    |
|                                        |          | 4.2           |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 4.1M     | Migrate to    |
|                                        |          | 4.2M          |
|                                        |----------+---------------|
|                                        | 4.2      | 4.2.205.0     |
|                                        |----------+---------------|
|                                        | 4.2M     | 4.2.207.54M   |
| IKE DoS Vulnerability (CSCta56653)     |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 5.0      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 5.1      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        | 5.2      | 5.2.193.11    |
|                                        |----------+---------------|
|                                        | 6.0      | 6.0.188.0     |
|                                        |----------+---------------|
|                                        | 7.0      | Not           |
|                                        |          | Vulnerable    |
|----------------------------------------+----------+---------------|
|                                        | 3.2      | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        | 4.1      | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        | 4.1M     | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        | 4.2      | 4.2.209.0     |
|                                        |----------+---------------|
|                                        | 4.2M     | 4.2.207.54M   |
|                                        |----------+---------------|
| HTTP DoS Vulnerability (CSCtd16938)    |          | Vulnerable;   |
|                                        | 5.0      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 5.1      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        | 5.2      | 5.2.193.11    |
|                                        |----------+---------------|
|                                        | 6.0      | 6.0.196.0     |
|                                        |----------+---------------|
|                                        | 7.0      | Not           |
|                                        |          | Vulnerable    |
|----------------------------------------+----------+---------------|
|                                        | 3.2      | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 4.1      | Migrate to    |
|                                        |          | 4.2           |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 4.1 M    | Migrate to    |
|                                        |          | 4.2M          |
|                                        |----------+---------------|
|                                        | 4.2      | 4.2.209.0     |
|                                        |----------+---------------|
| Privilege Escalation Vulnerabilities   | 4.2M     | 4.2.207.54M   |
| (CSCtc91431, CSCsz66726, and           |----------+---------------|
| CSCtc93837)                            |          | Vulnerable;   |
|                                        | 5.0      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 5.1      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        | 5.2      | 5.2.193.11    |
|                                        |----------+---------------|
|                                        | 6.0      | 6.0.188.0     |
|                                        |----------+---------------|
|                                        | 7.0      | Not           |
|                                        |          | Vulnerable    |
|----------------------------------------+----------+---------------|
|                                        | 3.2      | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        | 4.1      | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        | 4.1M     | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        | 4.2      | 4.2.207.0     |
|                                        |----------+---------------|
|                                        | 4.2M     | 4.2.207.54M   |
|                                        |----------+---------------|
| ACL Bypass Vulnerabilities (CSCta66931 |          | Vulnerable;   |
| and CSCtf36051)                        | 5.0      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        |          | Vulnerable;   |
|                                        | 5.1      | Migrate to    |
|                                        |          | 6.0           |
|                                        |----------+---------------|
|                                        | 5.2      | Not           |
|                                        |          | Vulnerable    |
|                                        |----------+---------------|
|                                        | 6.0      | 6.0.199.0     |
|                                        |----------+---------------|
|                                        | 7.0      | Not           |
|                                        |          | Vulnerable    |
+-------------------------------------------------------------------+

Recommended Releases
~~~~~~~~~~~~~~~~~~~~

The "Recommended Release" table lists the releases which have fixes
for all the published vulnerabilities at the time of this Advisory.
Cisco recommends upgrading to a release equal to or later than the
release in the "Recommended Releases" table.

+-------------------------------------------------------------------+
| Affected Release     | Recommended Release                        |
|----------------------+--------------------------------------------|
| 3.2                  | 3.2.215.0                                  |
|----------------------+--------------------------------------------|
| 4.1                  | Vulnerable; Migrate to 4.2                 |
|----------------------+--------------------------------------------|
| 4.1M                 | Vulnerable; Migrate to 4.2M                |
|----------------------+--------------------------------------------|
| 4.2                  | 4.2.209.0                                  |
|----------------------+--------------------------------------------|
| 4.2M                 | 4.2.207.54M                                |
|----------------------+--------------------------------------------|
| 5.0                  | Vulnerable; Migrate to 6.0                 |
|----------------------+--------------------------------------------|
| 5.1                  | Vulnerable; Migrate to 6.0                 |
|----------------------+--------------------------------------------|
| 5.2                  | Non FIPS Customers migrate to 6.0          |
|----------------------+--------------------------------------------|
| 6.0                  | 6.0.199.4                                  |
|----------------------+--------------------------------------------|
| 7.0                  | Not Vulnerable                             |
+-------------------------------------------------------------------+

Note: Cisco WLC Software version 5.2.193.11 is a FIPS certified
image. Customers not running FIPS images are recommended to migrate
to Cisco WLC software 6.0.199.4 or later.

Customers running 4.1M with a mixture of LAP1505/LAP1510 and LAP1522/
LAP1524 units will need to refer to the Mesh and Mainstream Releases
on the Controller section of the document Cisco Wireless Mesh Access
Points, Design and Deployment Guide, Release 7.0.

Workarounds
===========

There are no available workarounds to mitigate any of these
vulnerabilities.

Additional mitigations that can be deployed on Cisco devices in the
network are available in the Cisco Applied Mitigation Bulletin
companion document for this advisory, which is available at the
following link:

http://www.cisco.com/warp/public/707/cisco-amb-20100908-wlc.shtml

Obtaining Fixed Software
========================

Cisco has released free software updates that address these
vulnerabilities. Prior to deploying software, customers should
consult their maintenance provider or check the software for feature
set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets
they have purchased. By installing, downloading, accessing or
otherwise using such software upgrades, customers agree to be bound
by the terms of Cisco's software license terms found at:

http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html

or as otherwise set forth at Cisco.com Downloads at:

http://www.cisco.com/public/sw-center/sw-usingswc.shtml

Do not contact psirt () cisco com or security-alert () cisco com for
software upgrades.

Customers with Service Contracts
+-------------------------------

Customers with contracts should obtain upgraded software through
their regular update channels. For most customers, this means that
upgrades should be obtained through the Software Center on Cisco's
worldwide website at http://www.cisco.com.

Customers without Service Contracts
+----------------------------------

Customers who purchase direct from Cisco but do not hold a Cisco
service contract, and customers who purchase through third-party
vendors but are unsuccessful in obtaining fixed software through
their point of sale should acquire upgrades by contacting the Cisco
Technical Assistance Center (TAC). TAC contacts are as follows.

  * +1 800 553 2447 (toll free from within North America)
  * +1 408 526 7209 (toll call from anywhere in the world)
  * e-mail: tac () cisco com

Customers should have their product serial number available and be
prepared to give the URL of this notice as evidence of entitlement to
a free upgrade. Free upgrades for non-contract customers must be
requested through the TAC.

Refer to:

http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html

for additional TAC contact information, including localized telephone
numbers, and instructions and e-mail addresses for use in various
languages.

Exploitation and Public Announcements
=====================================

The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerabilities described in this advisory.

These vulnerabilities were found during internal testing and during
the troubleshooting of customer service requests.

Status of this Notice: FINAL
============================

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that
omits the distribution URL in the following section is an
uncontrolled copy, and may lack important information or contain
factual errors.

Distribution
============

This advisory is posted on Cisco's worldwide website at:

http://www.cisco.com/warp/public/707/cisco-sa-20100908-wlc.shtml

In addition to worldwide web posting, a text version of this notice
is clear-signed with the Cisco PSIRT PGP key and is posted to the
following e-mail and Usenet news recipients.

  * cust-security-announce () cisco com
  * first-bulletins () lists first org
  * bugtraq () securityfocus com
  * vulnwatch () vulnwatch org
  * cisco () spot colorado edu
  * cisco-nsp () puck nether net
  * full-disclosure () lists grok org uk
  * comp.dcom.sys.cisco () newsgate cisco com

Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the above URL for any updates.

Revision History
================

+-----------------------------------------+
| Revision |                   | Initial  |
| 1.0      | 2010-September-08 | public   |
|          |                   | release. |
+-----------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's worldwide website at:

http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html

This includes instructions for press inquiries regarding Cisco
security notices. All Cisco security advisories are available at:

http://www.cisco.com/go/psirt
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