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Cisco Security Advisory

Multiple Vulnerabilities in Cisco Wireless LAN Controllers

Advisory ID: cisco-sa-20130123-wlc

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130123-wlc

Revision 1.3

Last Updated  2013 January 30 20:36  UTC (GMT)

For Public Release 2013 January 23 16:00  UTC (GMT)

Related Resources:


Summary

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

  • Cisco Wireless LAN Controllers Wireless Intrusion Prevention System (wIPS) Denial of Service Vulnerability

  • Cisco Wireless LAN Controllers Session Initiation Protocol Denial of Service Vulnerability

  • Cisco Wireless LAN Controllers HTTP Profiling Remote Code Execution Vulnerability

  • Cisco Wireless LAN Controllers SNMP Unauthorized Access Vulnerability

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

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130123-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 7500 Series WLC
  • Cisco 8500 Series WLC
  • Cisco 500 Series Wireless Express Mobility Controllers
  • Cisco Wireless Services Module (Cisco WiSM)
  • Cisco Wireless Services Module version 2 (Cisco WiSM version 2)
  • Cisco NME-AIR-WLC Module for Integrated Services Routers (ISRs)
  • Cisco NM-AIR-WLC Module for Integrated Services Routers (ISRs)
  • Cisco Catalyst 3750G Integrated WLCs
  • Cisco Flex 7500 Series Cloud Controller
  • Cisco Virtual Wireless Controller
  • Cisco Wireless Controller Software for Integrated Services Module 300 and Cisco Services-Ready Engine 700, 710, 900, and 910

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 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

To determine the Cisco WLC Software 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

The Cisco WLCs and Cisco WiSMs are responsible for system-wide wireless LAN functionality, including 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 Wireless Intrusion Prevention System (wIPS) 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 reload by sending crafted IP packets to the affected device. This vulnerability affects Cisco WLCs that are configured with Wireless Intrusion Prevention System (wIPS). This vulnerability can be exploited from both wired and wireless segments.

This vulnerability is documented in Cisco bug ID CSCtx80743 (registered customers only) and has been assigned CVE ID CVE-2013-1102.

Cisco Wireless LAN Controllers Session Initiation Protocol Denial of Service Vulnerability

A denial of service (DoS) vulnerability exists on the Cisco Wireless Access Points (AP) that are managed by Cisco Wireless LAN Controllers (WLC) which could allow an unauthenticated, remote attacker to cause the AP to reload by sending crafted Session Initiation Protocol (SIP) packets to the affected device. This vulnerability can be exploited from both wired and wireless segments.

This vulnerability can be triggered by transit traffic and even if SIP features are disabled on the device.

This vulnerability is documented in Cisco bug ID CSCts87659 (registered customers only) and has been assigned CVE ID CVE-2013-1103.

Cisco Wireless LAN Controllers HTTP Profiling Remote Code Execution Vulnerability

The HTTP Profiling feature of Cisco WLC devices is affected by a remote code execution vulnerability that may allow an authenticated, remote attacker to execute arbitrary code on an affected device by sending a crafted UserAgent string. This vulnerability can be exploited from both wired and wireless segments.

Only Cisco WLC Software version 7.3.101.0 is affected by this vulnerability. A device is vulnerable only if the HTTP Profiling feature is enabled.

To determine if the HTTP Profiling feature is enabled, issue the show wlan command and locate the "HTTP" option under the "Network Admission Control"' section.  The following example shows the feature enabled:

(WLC)>show wlan 3
WLAN Identifier.................................. 3
<output suppressed>
Network Admission Control
  Client Profiling Status ....................... Enabled
   DHCP ......................................... Disabled
   HTTP ......................................... Enabled
<output suppressed>

This vulnerability is documented in Cisco bug ID CSCuc15636 (registered customers only) and has been assigned CVE ID CVE-2013-1104.

Cisco Wireless LAN Controllers SNMP Unauthorized Access Vulnerability

The Cisco Wireless LAN Controller (WLC) product family is affected by an unauthorized access vulnerability where an authenticated attacker could view and modify the configuration of an affected Cisco WLC via SNMP even if "management over wireless" feature is disabled.
This vulnerability is documented in Cisco bug ID CSCua60653 (registered customers only)  and has been assigned CVE ID CVE-2013-1105.

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



Cisco Wireless LAN Controllers Wireless Intrusion Prevention System (wIPS) Denial of Service Vulnerability  - CSCtx80743

Calculate the environmental score of CSCtx80743

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





Cisco Wireless LAN Controllers Session Initiation Protocol Denial of Service Vulnerability - CSCts87659

Calculate the environmental score of CSCts87659

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





Cisco Wireless LAN Controllers HTTP Profiling Remote Code Execution Vulnerability  - CSCuc15636

Calculate the environmental score of CSCuc15636

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed





Cisco Wireless LAN Controllers SNMP Unauthorized Access Vulnerability - CSCua60653

Calculate the environmental score of CSCua60653

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.4

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 HTTP Profiling Remote Code Execution Vulnerability could allow an authenticated, remote attacker to perform remote code execution on the affected device.

 Successful exploitation of the unauthorized access vulnerability could allow an authenticated attacker to view or modify the device configuration even if "management over wireless" is disabled.

Software Versions and Fixes

The following table provides software upgrade information to mitigate the vulnerabilities described in this security advisory:


Vulnerability/Bug ID

Affected Release

First Fixed Release

wIPS DoS Vulnerability (CSCtx80743)

4.2

Not vulnerable

4.2M

Not vulnerable

5.0

Not vulnerable

5.1

Not vulnerable

5.2

Not vulnerable

6.0

Not vulnerable

7.0

7.0.235.0

7.1

Vulnerable; migrate to 7.2 or later

7.2

7.2.110.0

7.3 7.3.101.0
7.4 Not vulnerable
 

SIP DoS Vulnerability (CSCts87659)

4.2

Not vulnerable

4.2M

Not vulnerable

5.0

Not vulnerable

5.1

Not vulnerable

5.2

Not vulnerable

6.0

Not Vulnerable

7.0

7.0.220.0

7.1

7.1.91.0

7.2

7.2.103.0

7.3 Not Vulnerable
7.4 Not Vulnerable

HTTP Profiling Remote Code Execution Vulnerability
 (CSCuc15636)

4.2

Not Vulnerable

4.2M

Not Vulnerable

5.0

Not Vulnerable

5.1

Not Vulnerable

5.2

Not Vulnerable

6.0

Not Vulnerable

7.0

Not Vulnerable

7.1

Not Vulnerable

7.2

Not Vulnerable

7.3 7.3.112.0
7.4 Not Vulnerable

Unauthorized Access Vulnerability (CSCua60653)

4.2

Not Vulnerable

4.2M

Not Vulnerable

5.0

Not Vulnerable

5.1

Not Vulnerable

5.2

Not Vulnerable

6.0

Not Vulnerable

7.0

7.0.235.3

7.1

Vulnerable; migrate to 7.2

7.2

7.2.111.3

7.3 7.3.101.0
7.4 Not Vulnerable

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. 


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

7.0.235.3

7.1

Vulnerable; migrate to 7.2 or later

7.2

7.2.111.3
7.3 7.3.112.0
7.4 Not vulnerable



Workarounds

The following section contains information about a workaround, if available, for each vulnerability described in this security advisory.

Cisco Wireless LAN Controllers Wireless Intrusion Prevention System (wIPS) Denial of Service Vulnerability
There are no workarounds to mitigate this vulnerability besides disabling wIPS features in the Cisco WLC.

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

Cisco Wireless LAN Controllers HTTP Profiling Remote Code Execution Vulnerability
There are no workarounds to mitigate this vulnerability besides disabling the HTTP Profiling feature in the Cisco WLC.

Cisco Wireless LAN Controllers SNMP Unauthorized Access Vulnerability
CPU based Access Control Lists (ACLs) can be configured to restrict SNMP access to the affected WLC. 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.

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.

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 Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

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.

The DoS and remote code execution vulnerabilities were found during the troubleshooting of customer service requests. The SNMP unauthorized access vulnerability was found and reported to Cisco by Darren Johnson (CCIE#20078). Cisco PSIRT greatly appreciates the opportunity to work with researchers on security vulnerabilities and welcomes the opportunity to review and assist in product reports.

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-20130123-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 1.3 2013-January-30 Updated table in the Software Versions and Fixes section.
Revision 1.2 2013-January-24 Updated table in the Software Versions and Fixes section.
Revision 1.1 2013-January-23 Updated Details section for the SIP vulnerability.
Revision 1.0 2013-January-23 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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