Cisco Security Advisory
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AV:A/AC:M/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the Cisco Discovery Protocol subsystem of Cisco Wireless LAN Controllers could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition.
The vulnerability is due to a failure to properly check for certain NULL values present in a Cisco Discovery Protocol packet. An attacker could exploit this vulnerability by submitting crafted Cisco Discovery Protocol requests to an affected device. The attacker would then need to convince a user to perform a Simple Network Management Protocol (SNMP) poll of the affected MIB. An attacker that can convince a user to perform an SNMP poll of the affected MIB could trigger a NULL pointer error that results in a restart of the device.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker must be on the same collision or broadcast domain as the targeted device. This access requirement reduces 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.
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Customers are advised to consult Cisco bug ID CSCuo12321 for the most complete list of affected product versions.
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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.
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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 email at tac@cisco.com for assistance.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Cisco Wireless LAN Controller contains a vulnerability that could allow an unauthenticated, adjacent attacker to cause a denial of service condition. Updates are available. NA Final 2014-Jun-09
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