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 software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available.

  This advisory is available at the following link:
  https://sec.cloudapps.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
  

  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
  
  Network Admission Control
    Client Profiling Status ....................... Enabled
     DHCP ......................................... Disabled
     HTTP ......................................... Enabled
  

  
  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.
  
  

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.

Fixed Software

• 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

  
  

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.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130123-wlc

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.

  Show Less