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Vulnerability Alert

Cisco Wireless LAN Controller Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:33098
Version:1
First Published:2014 March 05 16:13 GMT
Last Published:2014 March 05 16:13 GMT
Port: Not available
CVE:CVE-2014-0701
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
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 WebAuth feature of Cisco Wireless LAN Controllers (WLC) could allow an unauthenticated, remote attacker to cause the device to reload.

The vulnerability is due to a failure to deallocate memory used during the processing of a WebAuth login. An attacker could exploit this vulnerability by creating a large number of WebAuth requests at a high rate and leave them in an uncompleted state. An exploit could allow the attacker to consume all available memory on the device. This causes a watchdog process to restart the WLC, resulting in a denial of service (DoS) while the device reboots.

The WebAuth feature must be enabled and configured for a device to be affected by this vulnerability. This feature is disabled by default.

Cisco has confirmed the vulnerability in a security advisory and release software updates.
 
Warning Indicators
Cisco Wireless LAN Controller software versions prior to 7.0.250.0 and 7.4.110.0 are affected.
 
IntelliShield Analysis
Only devices with WebAuth enabled could be targeted for exploitation. The WebAuth feature is disabled by default, reducing the potential number of vulnerable devices.

Attackers may require access to internal networks to send authentication requests to a vulnerable device, limiting the source of exploitation.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCuf52361 at the following link: cisco-sa-20140305-wlc
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to consume available memory and cause the device to restart, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper processing of WebAuth login attempts by the affected device software.

An unauthenticated, remote attacker could exploit this vulnerability by sending a continuous series of authentication attempts to the vulnerable device. The processing of the login attempts could cause the device to consume increasing amounts of memory. The exhaustion of available memory could cause the device to restart, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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) 7.2 Base, 103.0 | 7.3 Base, .101.0 | 7.4 Base, 1.54

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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