Products & Services
Support

Product Categories


Popular Downloads


Manage Software

How to Buy

For Home

Linksys Products Store
Linksys is now part of Belkin
Products for everyone

All Ordering Options

Training & Events Partners
Guest

Cisco Applied Mitigation Bulletin

Identifying and Mitigating Exploitation of Multiple Vulnerabilities in Cisco Wireless LAN Controllers

 
Threat Type:IntelliShield: Applied Mitigation Bulletin
IntelliShield ID:30830
Version:1
First Published:2014 March 05 16:02 GMT
Last Published:2014 March 05 16:02 GMT
Port: Not available
CVE:CVE-2014-0701 , CVE-2014-0703 , CVE-2014-0704 , CVE-2014-0705 , CVE-2014-0706 , CVE-2014-0707
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
Related Resources:
 
 
Version Summary:

Cisco Applied Mitigation Bulletin initial public release.

 

Cisco Response

This Applied Mitigation Bulletin is a companion document to the PSIRT Security Advisory Multiple Vulnerabilities in Cisco Wireless LAN Controllers and provides identification and mitigation techniques that administrators can deploy on Cisco network devices.

Vulnerability Characteristics

There are multiple vulnerabilities in the Cisco Wireless LAN Controller. The following subsections summarize these vulnerabilities:

Cisco Wireless LAN Controller Denial of Service Vulnerability: The Cisco Wireless LAN Controller contains a vulnerability when it processes a flood of WebAuth IP version 4 (IPv4) and IP version 6 (IPv6) packets. This vulnerability can be exploited remotely without authentication and without end-user interaction. Successful exploitation of this vulnerability could cause the affected device to crash. Repeated attempts to exploit this vulnerability could result in a sustained DoS condition.

The attack vectors for exploitation are through IPv4 and IPv6 packets using the following protocols and ports:

  • WEBAUTH using TCP port 80
  • WEBAUTH using TCP port 3128
  • WEBAUTH using TCP port 8000
  • WEBAUTH using TCP port 8010
  • WEBAUTH using TCP port 8080
  • WEBAUTH using TCP port 8888
  • WEBAUTH using TCP port 24326

This vulnerability has been assigned Common Vulnerabilities and Exposures (CVE) identifier CVE-2014-0701.

Cisco Wireless LAN Controller Unauthorized Access to Associated Access Points Vulnerability: The Cisco Wireless LAN Controller contains a vulnerability when it processes malicious HTTP IP version 4 (IPv4) and IP version 6 (IPv6) packets. This vulnerability can be exploited remotely without authentication and without end-user interaction. Successful exploitation of this vulnerability could allow arbitrary code execution.

The attack vector for exploitation is through HTTP using TCP port 80 over IPv4 and IPv6 packets.

This vulnerability has been assigned Common Vulnerabilities and Exposures (CVE) identifier CVE-2014-0703.

Mitigation Technique Overview

Cisco devices provide several countermeasures for these vulnerabilities. Administrators are advised to consider these protection methods to be general security best practices for infrastructure devices and the traffic that transits the network. This section of the document provides an overview of these techniques.

Cisco IOS Software can provide effective means of exploit prevention using Infrastructure Access Control Lists (iACL). This protection mechanism filters and drops packets that are attempting to exploit this vulnerability.

Risk Management

Organizations are advised to follow their standard risk evaluation and mitigation processes to determine the potential impact of these vulnerabilities. Triage refers to sorting projects and prioritizing efforts that are most likely to be successful. Cisco has provided documents that can help organizations develop a risk-based triage capability for their information security teams. Risk Triage for Security Vulnerability Announcements and Risk Triage and Prototyping can help organizations develop repeatable security evaluation and response processes.

Device-Specific Mitigation and Identification

Caution:The effectiveness of any mitigation technique depends on specific customer situations such as product mix, network topology, traffic behavior, and organizational mission. As with any configuration change, evaluate the impact of this configuration prior to applying the change.

Specific information about mitigation and identification is available for these devices:

Cisco IOS Routers and Switches

Mitigation: Infrastructure Access Control Lists

To protect infrastructure devices and minimize the risk, impact, and effectiveness of direct infrastructure attacks, administrators are advised to deploy iACLs to perform policy enforcement of traffic sent to infrastructure equipment. Administrators can construct an iACL by explicitly permitting only authorized traffic sent to infrastructure devices in accordance with existing security policies and configurations. For the maximum protection of infrastructure devices, deployed iACLs should be applied in the ingress direction on all interfaces to which an IP address has been configured. An iACL workaround cannot provide complete protection against these vulnerabilities when the attack originates from a trusted source address.

The iACL policy denies unauthorized IPv4 and IPv6 packets on TCP ports 80, 3128, 8000, 8010, 8080, 8888, and 24326 that are sent to affected devices. In the following example, 192.168.60.0/24 and 2001:DB8:1:60::/64 represent the IP address space that is used by the affected devices, and the hosts at 192.168.100.1 and 2001:DB8::100:1 are considered trusted sources that require access to the affected devices. Care should be taken to allow required traffic for routing and administrative access prior to denying all unauthorized traffic. Whenever possible, infrastructure address space should be distinct from the address space used for user and services segments. Using this addressing methodology will assist with the construction and deployment of iACLs.

For additional information about iACLs, see Protecting Your Core: Infrastructure Protection Access Control Lists.


ip access-list extended Infrastructure-ACL-Policy
! !-- Include explicit permit statements for trusted sources that !-- require access on the vulnerable TCP ports ! permit tcp host 192.168.100.1 192.168.60.0 0.0.0.255 eq 80 permit tcp host 192.168.100.1 192.168.60.0 0.0.0.255 eq 3128 permit tcp host 192.168.100.1 192.168.60.0 0.0.0.255 eq 8000 permit tcp host 192.168.100.1 192.168.60.0 0.0.0.255 eq 8010 permit tcp host 192.168.100.1 192.168.60.0 0.0.0.255 eq 8080 permit tcp host 192.168.100.1 192.168.60.0 0.0.0.255 eq 8888 permit tcp host 192.168.100.1 192.168.60.0 0.0.0.255 eq 24326 ! !-- The following vulnerability-specific access control entries !-- (ACEs) can aid in identification of attacks ! deny tcp any 192.168.60.0 0.0.0.255 eq 80 deny tcp any 192.168.60.0 0.0.0.255 eq 3128 deny tcp any 192.168.60.0 0.0.0.255 eq 8000 deny tcp any 192.168.60.0 0.0.0.255 eq 8010 deny tcp any 192.168.60.0 0.0.0.255 eq 8080 deny tcp any 192.168.60.0 0.0.0.255 eq 8888 deny tcp any 192.168.60.0 0.0.0.255 eq 24326 ! !-- Permit or deny all other Layer 3 and Layer 4 traffic in accordance !-- with existing security policies and configurations ! !-- Explicit deny for all other IP traffic ! deny ip any 192.168.60.0 0.0.0.255 ! ! !-- Create the corresponding IPv6 tACL ! ipv6 access-list IPv6-Infrastructure-ACL-Policy ! !-- Include explicit permit statements for trusted sources that !-- require access on the vulnerable TCP ports ! permit tcp host 2001:DB8::100:1 2001:DB8:1:60::/64 eq 80 permit tcp host 2001:DB8::100:1 2001:DB8:1:60::/64 eq 3128 permit tcp host 2001:DB8::100:1 2001:DB8:1:60::/64 eq 8000 permit tcp host 2001:DB8::100:1 2001:DB8:1:60::/64 eq 8010 permit tcp host 2001:DB8::100:1 2001:DB8:1:60::/64 eq 8080 permit tcp host 2001:DB8::100:1 2001:DB8:1:60::/64 eq 8888 permit tcp host 2001:DB8::100:1 2001:DB8:1:60::/64 eq 24326 ! !-- The following vulnerability-specific ACEs can !-- aid in identification of attacks to global and !-- link-local addresses ! deny tcp any 2001:DB8:1:60::/64 eq 80 deny tcp any 2001:DB8:1:60::/64 eq 3128 deny tcp any 2001:DB8:1:60::/64 eq 8000 deny tcp any 2001:DB8:1:60::/64 eq 8010 deny tcp any 2001:DB8:1:60::/64 eq 8080 deny tcp any 2001:DB8:1:60::/64 eq 8888 deny tcp any 2001:DB8:1:60::/64 eq 24326 ! !-- Permit or deny all other Layer 3 and Layer 4 traffic in !-- accordance with existing security policies and configurations !-- and allow IPv6 neighbor discovery packets, which !-- include neighbor solicitation packets and neighbor !-- advertisement packets ! permit icmp any any nd-ns permit icmp any any nd-na ! !-- Explicit deny for all other IPv6 traffic ! deny ipv6 any 2001:DB8:1:60::/64 ! ! !-- Apply tACLs to interface in the ingress direction ! interface GigabitEthernet0/0 ip access-group Infrastructure-ACL-Policy in ipv6 traffic-filter IPv6-Infrastructure-ACL-Policy in

Note that filtering with an interface access list will elicit the transmission of ICMP unreachable messages back to the source of the filtered traffic. Generating these messages could have the undesired effect of increasing CPU utilization on the device. In Cisco IOS Software, ICMP unreachable generation is limited to one packet every 500 milliseconds by default. ICMP unreachable message generation can be disabled using the interface configuration commands no ip unreachables and no ipv6 unreachables. ICMP unreachable rate limiting can be changed from the default using the global configuration commands ip icmp rate-limit unreachable interval-in-ms and ipv6 icmp error-interval interval-in-ms.

For information about how to use the Cisco IOS Software command line interface to gauge the effectiveness of the iACL, see the Cisco Security white paper Identifying the Effectiveness of Security Mitigations Using Cisco IOS Software.

Additional Information

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.

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/web/about/security/psirt/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.

Related Information

 
Alert History
 

Alert History

Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco Wireless LAN Controller (WLC) 4.0 .108, .155.0, .155.5, .179.8, .179.11, .196, .206.0, .217.0, .219.0 | 4.1 Base, .171.0, .181.0, .185.0 | 4.2 Base, .61.0, .99.0, .112.0, .117.0, .130.0, .173.0, .174.0, .176.0, .182.0 | 5.0 .148.0, .148.2 | 5.1 .151.0, .152.0, .160.0 | 5.2 .157.0, .169.0 | 6.0 Base, 182.0, 188.0, 196.0, 199.4, 202.0 | 7.0 Base, 98.0, 98.218, 116.0, 220.0 | 7.1 Base, 91.0 | 7.2 Base, 103.0 | 7.3 Base, .101.0, .112 | 7.4 Base, 1.54, .100, .100.60, .110 | 7.5 Base, .102.0

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
Powered by  IntelliShield