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 wireless intrusion detection (WIDS) feature of the Cisco Wireless LAN Controller (WLC) could allow an unauthenticated, remote attacker to force the WLC to become unresponsive.
For a Cisco WLC with a default configuration, the attacker could exploit this vulnerability by sending a large number of crafted packets to an affected WLC. The attack requires an administrator to click the IDS events under Security > Wireless Protection Policies > Signature Events Summary in the WLC admin web interface. When the administrator clicks the IDS events after the attacker sends the crafted packets, the WLC becomes unresponsive and all wireless clients are disconnected.
This vulnerability was found and reported to Cisco by Darren Johnson.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as the targeted device to send a large number of crafted packets to the 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.
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Customers are advised to consult Cisco bug ID CSCus46861 for a 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 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.
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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 Initial Release NA Final 2015-Feb-19
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