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 18.104.22.168 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
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