Cisco Wireless LAN Controller contains a vulnerability that could allow an unauthenticated, remote attacker to gain unauthorized access to the vulnerable device. Updates are available.
A vulnerability in the Cisco IOS code that is pushed to Cisco Aironet 1260, 2600, 3500, and 3600 Series access points (AP) by a Cisco Wireless LAN Controller (WLC) could allow an unauthenticated, remote attacker to gain unauthorized, privileged access to the affected device.
The vulnerability is due to a race condition that could result in the administrative HTTP server of an affected access point being enabled even though it is explicitly disabled by an administrator. An attacker could exploit this vulnerability by attempting to authenticate to an affected device using locally-stored credentials of the AP. A successful attack could allow an attacker to take complete control of the affected AP and make arbitrary changes to the configuration.
In many deployment scenarios, the locally-stored default AP username and password has not been changed from the factory default. In these zero-touch scenarios, the devices are designed to connect automatically to a WLC and download firmware and configurations.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
Cisco Wireless LAN Controller software prior to version 126.96.36.199 is affected.
Attackers may require access to internal networks to connect to exposed HTTP services on affected devices.
An unauthenticated, remote attacker could exploit the vulnerability to bypass access restrictions and make unauthorized changes to the device configuration that could allow an attacker to take complete control of the device.
The vulnerability is due to an error condition in the device administrative HTTP server. A race condition may occur that enables the HTTP server even though the interface is disabled in the device configuration.
An unauthenticated, remote attacker could exploit this vulnerability by connecting to the exposed administrative interface. The attacker could leverage the access to change values within the device configuration.
Administrators are advised to apply the appropriate updates.
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 Wireless LAN Controller (WLC)
7.4 Base, 1.54
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.
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.