Cisco ASA/Firepower Threat Defense Software TLS improper validation of specified type of input

Summaryinfo

A vulnerability was found in Cisco ASA and Firepower Threat Defense Software and classified as problematic. This vulnerability affects unknown code of the component TLS. Executing a manipulation can lead to improper validation of specified type of input. The identification of this vulnerability is CVE-2024-20494. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Cisco ASA and Firepower Threat Defense Software (the affected version is unknown) and classified as critical. This vulnerability affects an unknown code of the component TLS. The manipulation with an unknown input leads to a improper validation of specified type of input vulnerability. The CWE definition for the vulnerability is CWE-1287. The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type. As an impact it is known to affect availability. CVE summarizes:

A vulnerability in the TLS cryptography functionality of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper data validation during the TLS 1.3 handshake. An attacker could exploit this vulnerability by sending a crafted TLS 1.3 packet to an affected system through a TLS 1.3-enabled listening socket. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: This vulnerability can also impact the integrity of a device by causing VPN HostScan communication failures or file transfer failures when Cisco ASA Software is upgraded using Cisco Adaptive Security Device Manager (ASDM).

The advisory is available at sec.cloudapps.cisco.com. This vulnerability was named CVE-2024-20494 since 11/08/2023. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/01/2025).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• ASA
• Firepower Threat Defense Software

License

• commercial

Website

• Vendor: https://www.cisco.com/

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