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Cisco Security Advisory

Multiple Vulnerabilities in Cisco Wireless LAN Controllers

Advisory ID: cisco-sa-20120229-wlc

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120229-wlc

Revision 1.2

Last Updated  2012 March 16 20:46  UTC (GMT)

For Public Release 2012 February 29 16:00  UTC (GMT)


Summary

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

  • Cisco Wireless LAN Controllers HTTP Denial of Service Vulnerability
  • Cisco Wireless LAN Controllers IPv6 Denial of Service Vulnerability
  • Cisco Wireless LAN Controllers WebAuth Denial of Service Vulnerability
  • Cisco Wireless LAN Controllers Unauthorized Access Vulnerability

Cisco has released free software updates that address these vulnerabilities. Workarounds are available that mitigate some of these vulnerabilities.

 This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120229-wlc

Affected Products

The Cisco WLC product family is affected by multiple vulnerabilities. Affected versions of Cisco WLC Software vary depending on the specific vulnerability.

Vulnerable Products

For specific version information, refer to the Software Versions and Fixes section of this advisory.

Each of the following products is affected by at least one of the vulnerabilities covered in this Security Advisory:
  • Cisco 2000 Series WLC
  • Cisco 2100 Series WLC
  • Cisco 2500 Series WLC
  • Cisco 4100 Series WLC
  • Cisco 4400 Series WLC
  • Cisco 5500 Series WLC
  • Cisco 500 Series Wireless Express Mobility Controllers
  • Cisco Wireless Services Modules (WiSM)
  • Cisco Wireless Services Modules version 2 (WiSM version 2)
  • Cisco NME-AIR-WLC Modules for Integrated Services Routers (ISRs)
  • Cisco NM-AIR-WLC Modules for Integrated Services Routers (ISRs)
  • Cisco Catalyst 3750G Integrated WLCs
  • Cisco Flex 7500 Series Cloud Controllers
Note: The  Cisco 2000 Series WLCs, Cisco 4100 Series WLCs, Cisco NM-AIR-WLC, and Cisco 500 Series Wireless Express Mobility Controllers,  have reached end-of-software maintenance. The following table includes the end-of-life document URL for each model:

Model

End of Life Document URL

Cisco 2000 Series WLC

http://www.cisco.com/en/US/prod/collateral/wireless/ps6302/ps8322/ps6308/prod_end-of-life_notice0900aecd805d22b0.html

Cisco 4100 Series WLC

http://www.cisco.com/en/US/prod/collateral/wireless/ps6302/ps8322/ps6307/prod_end-of-life_notice0900aecd803387a9.html

Cisco NM-AIR-WLC Modules for ISR

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/prod_end-of-life_notice0900aecd806aeb34.html

Cisco 500 Series Wireless Express Mobility Controllers

http://www.cisco.com/en/US/prod/collateral/wireless/ps7306/ps7320/ps7339/end_of_life_c51-568040.html



Determination of Software Versions

To determine the WLC version that is running in a given environment, use one of the following methods:
  • In the web interface, choose the Monitor tab, click Summary in the left pane, and note the Software Version field.
  • In the command-line interface, issue the show sysinfo command as shown in the following 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>

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 the following vulnerabilities:

Cisco Wireless LAN Controllers HTTP Denial of Service Vulnerability

The Cisco Wireless LAN Controller (WLC) product family is affected by a denial of service (DoS) vulnerability that could allow an unauthenticated, remote attacker to cause the device to crash by submitting a malformed URL to the administrative management interface.


Both HTTP and HTTPs are affected by this vulnerability.
This vulnerability is documented in Cisco bug ID CSCts81997 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-0368.

Cisco Wireless LAN Controllers IPv6 Denial of Service Vulnerability
The Cisco Wireless LAN Controller (WLC) product family is affected by a denial of service (DoS) vulnerability where an unauthenticated attacker could cause a device reload by sending a series of IPv6 packets.

The IPv6 pass-through feature is not affected by this vulnerability. Legitimate IPv6 traffic can trigger this vulnerability.

Note: Cisco 4400 Series WLC, Cisco Wireless Services Modules (WiSM), and Cisco Catalyst 3750G Integrated WLCs are not affected by this vulnerability.

This vulnerability is documented in Cisco bug ID CSCtt07949 (registered customers only) and has been assigned CVE ID CVE-2012-0369.

Cisco Wireless LAN Controllers WebAuth Denial of Service Vulnerability
The Cisco Wireless LAN Controller (WLC) product family is affected by a denial of service (DoS) vulnerability where an unauthenticated attacker could cause a device reload by sending a series of HTTP or HTTPS packets to an affected controller configured for WebAuth.

This vulnerability can be exploited from both wired and wireless segments. A TCP three-way handshake is needed in order to exploit this vulnerability.

This vulnerability is documented in Cisco bug ID CSCtt47435 (registered customers only)and has been assigned CVE ID CVE-2012-0370.

Cisco Wireless LAN Controllers Unauthorized Access Vulnerability

The Cisco Wireless LAN Controller (WLC) product family is affected by an unauthorized access vulnerability where an unauthenticated attacker could view and modify the configuration of an affected Cisco WLC.


This vulnerability exists if CPU-based access control lists (ACLs) are configured in the wireless controller. An attacker can exploit this vulnerability by connecting to the controller over TCP port 1023. Only the Cisco 4400 Series WLCs, WiSM version 1, and Cisco Catalyst 3750G Integrated WLCs are affected by this vulnerability.

This vulnerability is documented in Cisco bug ID CSCtu56709 (registered customers only) and has been assigned CVE ID CVE-2012-0371.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

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

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

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

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

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



CSCts81997 - Cisco Wireless LAN Controllers HTTP Denial of Service Vulnerability

Calculate the environmental score of CSCts81997

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed




CSCtt07949 - Cisco Wireless LAN Controllers IPv6 Denial of Service Vulnerability

Calculate the environmental score of CSCtt07949

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed



CSCtt47435 - Cisco Wireless LAN Controllers WebAuth Denial of Service Vulnerability

Calculate the environmental score of CSCtt47435

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed



CSCtu56709 - Cisco Wireless LAN Controllers Unauthorized Access Vulnerability

Calculate the environmental score of CSCtu56709

CVSS Base Score - 9.3

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

Complete

Complete

Complete

CVSS Temporal Score - 7.7

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

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

Successful exploitation of the unauthorized access vulnerability could allow an unauthenticated attacker to view or modify the device configuration.

Software Versions and Fixes

When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

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 Release

First Fixed Release

HTTP DoS Vulnerability (CSCts81997)

4.0

Vulnerable; Migrate to 7.0 or later

4.1

Vulnerable; Migrate to 7.0 or later

4.1M

Vulnerable; Migrate to 7.0 or later

4.2

Vulnerable; Migrate to 7.0 or later

4.2M

Vulnerable; Migrate to 7.0 or later

5.0

Vulnerable; Migrate to 7.0 or later

5.1

Vulnerable; Migrate to 7.0 or later

5.2

Vulnerable; Migrate to 7.0 or later

6.0

Vulnerable; Migrate to 7.0 or later

7.0

7.0.121.3
(7.0.220.0 CCO)

7.1

7.1.90.2
(7.1.91.0 CCO)

7.2

7.2.1.57
(7.2.103.0 CCO)

 

IPv6DoS Vulnerability (CSCtt07949)

4.0

Not Vulnerable

4.1

Not Vulnerable

4.1M

Not Vulnerable

4.2

Not Vulnerable

4.2M

Not Vulnerable

5.0

Not Vulnerable

5.1

Not Vulnerable

5.2

Not Vulnerable

6.0

Vulnerable; Migrate to 7.0 or later

7.0

7.0.121.3
(7.0.220.0 CCO)

7.1

7.1.90.2
(7.1.91.0 CCO)

7.2

7.2.1.58
(7.2.103.0 CCO)

WebAuth DoS Vulnerability  (CSCtt47435)

4.0

Vulnerable; Migrate to 7.0 or later

4.1

Vulnerable; Migrate to 7.0 or later

4.1M

Vulnerable; Migrate to 7.0 or later

4.2

Vulnerable; Migrate to 7.0 or later

4.2M

Vulnerable; Migrate to 7.0 or later

5.0

Vulnerable; Migrate to 7.0 or later

5.1

Vulnerable; Migrate to 7.0 or later

5.2

Vulnerable; Migrate to 7.0 or later

6.0

Vulnerable; Migrate to 7.0 or later

7.0

7.0.121.5
(7.0.220.0 CCO)

7.1

7.1.90.5
(7.1.91.0 CCO)

7.2

 Not Vulnerable

Unauthorized Access Vulnerability (CSCtu56709)

4.0

Vulnerable; Migrate to 7.0 or later

4.1

Vulnerable; Migrate to 7.0 or later

4.1M

Vulnerable; Migrate to 7.0 or later

4.2

Vulnerable; Migrate to 7.0 or later

4.2M

Vulnerable; Migrate to 7.0 or later

5.0

Vulnerable; Migrate to 7.0 or later

5.1

Vulnerable; Migrate to 7.0 or later

5.2

Vulnerable; Migrate to 7.0 or later

6.0

Vulnerable; Migrate to 7.0 or later

7.0

7.0.220.4
(7.0.230.0 CCO)

7.1

Not Vulnerable

7.2

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

7.0

7.0.230.0

7.1

7.1.91.0

7.2

7.2.103.0

Workarounds

This Cisco Security Advisory describes multiple distinct vulnerabilities. These vulnerabilities and their respective workarounds are independent of each other.

Cisco Wireless LAN Controllers HTTP Denial of Service Vulnerability
There are no workarounds to mitigate this vulnerability.

Cisco Wireless LAN Controllers IPv6 Denial of Service Vulnerability
There are no workarounds to mitigate this vulnerability.

Cisco Wireless LAN Controllers WebAuth Denial of Service Vulnerability
There are no workarounds to mitigate this vulnerability.

Cisco Wireless LAN Controllers Unauthorized Access Vulnerability
CPU based ACLs can be configured to block access to the affected WLC on TCP port 1023. 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.

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://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20120229-wlc

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html, or as set forth 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, upgrades should be obtained through the Software Center on Cisco.com at http://www.cisco.com.

Customers Using Third-Party Support Organizations

Customers with Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers, should contact that organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):

  • +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 the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are 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 Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120229-wlc

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:

  • 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

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.


Revision History

Revision 1.2 2012-March-16 Software table update.
Revision 1.1 2012-March-1 Software table update.
Revision 1.0 2012-February-29 Initial public release.

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.


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