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Vulnerability Alert

Cisco Wireless LAN Controller MLDv2 Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:33101
Version:1
First Published:2014 March 05 16:14 GMT
Last Published:2014 March 05 16:14 GMT
Port: Not available
CVE:CVE-2014-0705
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
 
Version Summary:Cisco Wireless LAN Controller contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the multicast listener discovery (MLD) service of a Cisco WLC configured for IPv6 could allow an unauthenticated, remote attacker to cause a denial of service condition.

The vulnerability is due to a failure to properly parse malformed MLD version 2 messages. An attacker could exploit this vulnerability by submitting a malformed MLDv2 packet to a multicast-enabled network that the Cisco WLC is listening for. An exploit could allow the attacker to trigger a critical error on the WLC, resulting in a DoS condition while the device restarts.

The MLDv2 Snooping feature is disabled by default and must be explicitly configured by an administrator for a device to be vulnerable.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco Wireless LAN Controller software versions prior to 7.4.121.0 and 7.6.100.0 are affected.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send malformed MLDv2 packets to an affected device. This access requirement may reduce the likelihood of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCuh74233 at the following link: cisco-sa-20140305-wlc
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to reload, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper parsing of malformed MLD version 2 messages by an affected device.

An unauthenticated, remote attacker could exploit this vulnerability by submitting a malformed MLDv2 packet to a multicast-enabled network that the targeted device is listening for. Once processed, the malformed MLDv2 packet could trigger a critical error and cause the device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of Multiple Vulnerabilities in Cisco Wireless LAN Controllers

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Wireless LAN Controller (WLC) 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.
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