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AUSCERT External Security Bulletin Redistribution
Cisco Wireless LAN Controller Wireless Web Authentication
Denial of Service Vulnerability
12 May 2015
AusCERT Security Bulletin Summary
Product: Cisco Wireless LAN Controller
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2015-0723
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Cisco Wireless LAN Controller Wireless Web Authentication Denial of Service
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 38749
First Published: 2015 May 08 16:32 GMT
Last Published: 2015 May 08 16:32 GMT
Port: Not available
Urgency: Unlikely Use
Severity: Mild Damage
CVSS Base: 6.1 CVSS Calculator
CVSS Version 2.0
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.
A vulnerability in the wireless web authentication subsystem of Cisco Wireless
LAN Controller (WLC) could allow an unauthenticated, adjacent attacker to
cause a denial of service (DoS) condition.
The vulnerability exists due to improper input sanitization of a certain value
that is supplied by a user prior to successfully authenticating to an affected
device. An attacker could exploit this vulnerability by sending a request
designed to trigger the vulnerability and cause a process crash that will
trigger a restart of the device, resulting in a DoS condition.
Cisco has confirmed the vulnerability and released software updates.
At the time this alert was first published, Cisco WLC versions 7.5.x or
versions prior to 7.6.120 were vulnerable. Later versions of Cisco WLC may
also be vulnerable.
To exploit this vulnerability, an attacker must have access to the same
broadcast or collision domain as the targeted device. This access requirement
decreases 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 CSCum03269 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 process on an affected device to crash, resulting in a DoS condition.
The vulnerability is due to improper sanitization of a certain user-supplied
value by an affected device.
An unauthenticated, adjacent attacker could exploit this vulnerability by
sending a request designed to trigger the vulnerability and cause a process
crash that will trigger a restart of the device, resulting in a DoS condition.
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.
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 firstname.lastname@example.org.
The security vulnerability applies to the following combinations of products.
Cisco Cisco Wireless LAN Controller (WLC) 7.5 .102.0, .102.11 | 7.6 .100.0
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