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AUSCERT External Security Bulletin Redistribution
ESB-2015.1417
Cisco Wireless LAN Controller TCP Denial of Service Vulnerability
29 May 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Wireless LAN Controller
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0756
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=39041
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Vulnerability Alert
Cisco Wireless LAN Controller TCP Denial of Service Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 39041
Version: 1
First Published: 2015 May 27 18:55 GMT
Last Published: 2015 May 27 18:55 GMT
Port: Not available
CVE: CVE-2015-0756
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
A vulnerability in the Cisco Wireless LAN Controller (WLC) could allow an
unauthenticated, adjacent attacker to cause a Denial of Service (DoS)
condition on the affected device.
The vulnerability is due to improper input validation. An attacker could
exploit this vulnerability by sending crafted TCP traffic to the affected
device. An exploit could allow the attacker to cause a DoS condition on the
affected device and the associated wireless access points.
Cisco has confirmed the vulnerability and released software updates.
Warning Indicators
At the time this alert was first published, Cisco WLC software version
7.4(1.1) was vulnerable. Later versions of Cisco WLC software may also be
vulnerable.
IntelliShield Analysis
To exploit this vulnerability, an attacker must have access to 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 CSCug67104 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 an affected device as well as any wireless access
points associated with the device, denying services to legitimate users.
Technical Information
The vulnerability is due to insufficient validation of user-supplied input
processed by an affected device.
An attacker could exploit this vulnerability by sending crafted TCP traffic to
the targeted device. An exploit could allow the attacker to cause a DoS
condition on the device and any wireless access points associated with the
device.
Safeguards
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.
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) 7.4 .1.1
Associated Products:
N/A
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are
highlighted by analysts in the Cisco Threat Operations Center and represent a
subset of the comprehensive content that is available through Cisco Security
IntelliShield Alert Manager Service. This customizable threat and
vulnerability alert service provides security staff with access to timely,
accurate, and credible information about threats and vulnerabilities that may
affect their environment.
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.
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