Date: 12 October 2015
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AUSCERT External Security Bulletin Redistribution
Cisco Wireless LAN Controller Devices 802.11i Management
Frame Denial of Service Vulnerability
12 October 2015
AusCERT Security Bulletin Summary
Product: Cisco Wireless LAN Controller Devices
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2015-6311
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Cisco Wireless LAN Controller Devices 802.11i Management Frame Denial of
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 41249
First Published: 2015 October 02 14:01 GMT
Last Published: 2015 October 02 14:01 GMT
Port: Not available
Urgency: Unlikely Use
Severity: Mild Damage
CVSS Base: 6.1
CVSS Temporal: 5.0
Version Summary: Cisco Wireless LAN Controller contains a vulnerability that
could allow an unauthenticated, adjacent attacker to cause a denial of service
condition. Updates are available.
Cisco Wireless LAN Controller (WLC) devices contain a denial of service
vulnerability that could allow an unauthenticated, adjacent attacker to cause
a denial of service (DoS) condition.
The vulnerability is due to a failure to properly discard certain malformed
values in an 802.11i management frame received from a wireless client. An
attacker could trigger the vulnerability by submitting a crafted frame to an
access point managed by the affected Cisco WLC.
Cisco has confirmed the vulnerability and released software updates.
At the time this alert was first published, Cisco WLC Software releases
7.4(1.19), 7.3(101.0), and 7.0(240.0) were vulnerable. Later releases of Cisco
WLC Software may also be vulnerable.
IntelliShield Analysis To exploit this vulnerability, an attacker must be on
the same broadcast or collision 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.
Cisco has released bug ID CSCub65236 for registered users, which contains
additional details and an up-to-date list of affected product versions.
An unauthenticated, adjacent attacker could exploit this vulnerability to
cause a DoS condition on a targeted device.
The vulnerability is due to improper handling of malformed 802.11i management
frames by the wireless client.
An unauthenticated, adjacent attacker could exploit this vulnerability by
sending a crafted frame to an access point managed by the affected device. A
successful exploit could cause the device to stop functioning, resulting in a
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 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.
The security vulnerability applies to the following combinations of products.
Cisco Cisco Wireless LAN Controller (WLC) 7.0 240.0 | 7.3 .101.0 | 7.4 1.19
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.
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