Cisco Wireless LAN Controller contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in the Cisco WLC could allow an unauthenticated, remote attacker to trigger a critical error, resulting in a DoS condition while the device restarts.
This vulnerability is due to a failure to correctly process an Ethernet 802.11 frame. An attacker could exploit this vulnerability by sending a specially crafted Ethernet 802.11 frame. Repeated exploitation may result in a sustained DoS condition.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
Cisco Wireless LAN Controller software versions prior to 18.104.22.168 and 22.214.171.124 are affected.
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send crafted Ethernet 802.11 frames 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.
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to reload, resulting in a DoS condition.
This vulnerability is due to improper processing of Ethernet 802.11 frames by an affected device.
An attacker could exploit this vulnerability by sending a crafted Ethernet 802.11 frame to the targeted device. Processing the frame could cause a critical error in the device, resulting in a DoS condition. Repeated exploitation may result in a sustained DoS condition.
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.
Administrators are advised to monitor affected systems.
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 email@example.com.
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