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 220.127.116.11 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
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