Cisco Wireless LAN Controller Software contains a vulnerability that could allow an authenticated, adjacent attacker to cause a denial of service condition. Updates are available.
Cisco Wireless LAN Controller Software contains a vulnerability that could allow an authenticated, adjacent attacker to cause a denial of service (DoS) condition.
The vulnerability is due to the improper handling of user-supplied input processed by the mDNS snooping feature of the affected software. An authenticated, adjacent attacker could exploit this vulnerability by sending crafted mDNS packets to the affected system. Processing the crafted packets could trigger a reload of the affected device, resulting in a DoS condition.
Cisco has confirmed the vulnerability and software updates are available.
At the time this alert was first published, Cisco Wireless LAN Controller Software versions 220.127.116.11 and prior were vulnerable. Later versions of Cisco Wireless LAN Controller Software may also be affected.
A successful exploit could allow an attacker to cause a targeted device to crash, temporarily preventing authorized users from accessing network resources served by the targeted device.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Customers are advised to review the bug report in the vendor announcements section for a current list of affected versions.
An authenticated, adjacent attacker could exploit the vulnerability to cause the targeted device to crash, resulting in a DoS condition.
The vulnerability is due to a buffer handling error in the mDNS snooping feature of the affected software.
An authenticated, adjacent attacker could exploit this vulnerability by sending crafted mDNS packets to the affected system. Processing the crafted packets could trigger a reload of the affected device, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at firstname.lastname@example.org for assistance.
The security vulnerability applies to the following combinations of products.
Cisco Wireless LAN Controller (WLC)
7.4 Base, 1.54
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.
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.