Cisco Security Advisory

Contents

Summary
Affected Products
Details
Vulnerability Scoring Details
Impact
Software Versions and Fixes
Workarounds
Obtaining Fixed Software
Exploitation and Public Announcements
Status of This Notice: Final
Distribution
Revision History
Cisco Security Procedures

• 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

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

Vulnerable Products

(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

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

Cisco Wireless LAN Controllers HTTP Profiling Remote Code Execution Vulnerability

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

Cisco Wireless LAN Controllers SNMP Unauthorized Access Vulnerability

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

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.

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

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

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

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.

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 Using Third-Party Support Organizations

Customers Without Service Contracts

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.

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.

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.

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/en/US/products/products_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.