Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions and gain unauthorized access to a device. Updates are available.
A vulnerability in the authentication code of remote management via Cisco Adaptive Security Device Management (ASDM) could allow an unauthenticated, remote attacker to bypass the digital certificate authentication. Depending on the configuration, this may allow the attacker to remotely connect as administrator to the management interface via Cisco ASDM and take full control of the affected system.
The vulnerability is due to an error in the implementation of the authentication-certificate option, which enables client-side digital certificate authentication. An attacker could exploit this vulnerability by trying to authenticate to an interface of the affected system where Cisco ASDM is enabled.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
Cisco Adaptive Security Appliance Software versions prior to 8.2(5.46), 8.3(2.39), 8.4(6.6), 8.5(1.18), 8.6(1.12), 8.7(1.7), 9.0(3.1), and 9.1(2.6) are vulnerable.
Only devices with interfaces that have enabled Cisco Adaptive Security Device Management (ASDM) are vulnerable, limiting the potential for exploitation.
An unauthenticated, remote attacker could exploit this vulnerability to gain unauthorized access to a targeted device.
The vulnerability is due to improper processing of authentication using digital certificates.
An unauthenticated, remote attacker could exploit the vulnerability by attempting to authenticate to a vulnerable device. Improper handling of the authentication request could allow the attacker to bypass authentication checks and gain unauthorized access to the device.
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.
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