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ESB-2015.2572 - [Cisco] Cisco Wireless LAN Controller Devices: Denial of service - Remote/unauthenticated

Date: 12 October 2015

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2572
         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
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-6311  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=41249

- --------------------------BEGIN INCLUDED TEXT--------------------

ulnerability Alert

Cisco Wireless LAN Controller Devices 802.11i Management Frame Denial of 
Service Vulnerability

Threat Type: CWE-399: Resource Management Errors

IntelliShield ID: 41249

Version: 1

First Published: 2015 October 02 14:01 GMT

Last Published: 2015 October 02 14:01 GMT

Port: Not available

CVE: CVE-2015-6311

Urgency: Unlikely Use

Credibility: Confirmed

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.

Description

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.

Warning Indicators

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.

Vendor Announcements

Cisco has released bug ID CSCub65236 for registered users, which contains 
additional details and an up-to-date list of affected product versions.

Impact

An unauthenticated, adjacent attacker could exploit this vulnerability to 
cause a DoS condition on a targeted device.

Technical Information

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
DoS condition.

Safeguards

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.

Patches/Software

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 tac@cisco.com.

Alert History

Initial Release

Product Sets

The security vulnerability applies to the following combinations of products.

Primary Products:

Cisco Cisco Wireless LAN Controller (WLC) 7.0 240.0 | 7.3 .101.0 | 7.4 1.19

Associated Products:

N/A

LEGAL DISCLAIMER

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.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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