Cisco ASA/Firepower Threat Defense Clientless SSL VPN request smuggling

Summaryinfo

A vulnerability described as problematic has been identified in Cisco ASA and Firepower Threat Defense. This impacts an unknown function of the component Clientless SSL VPN. Executing a manipulation can lead to request smuggling. This vulnerability is registered as CVE-2022-20713. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Cisco ASA and Firepower Threat Defense (Firewall Software) (unknown version) and classified as problematic. This vulnerability affects an unknown code block of the component Clientless SSL VPN. The manipulation with an unknown input leads to a request smuggling vulnerability. The CWE definition for the vulnerability is CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. As an impact it is known to affect integrity, and availability. CVE summarizes:

A vulnerability in the VPN web client services component of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct browser-based attacks against users of an affected device. This vulnerability is due to improper validation of input that is passed to the VPN web client services component before being returned to the browser that is in use. An attacker could exploit this vulnerability by persuading a user to visit a website that is designed to pass malicious requests to a device that is running Cisco ASA Software or Cisco FTD Software and has web services endpoints supporting VPN features enabled. A successful exploit could allow the attacker to reflect malicious input from the affected device to the browser that is in use and conduct browser-based attacks, including cross-site scripting attacks. The attacker could not directly impact the affected device.

The weakness was published 08/11/2022 as cisco-sa-asa-webvpn-LOeKsNmO. The advisory is available at tools.cisco.com. This vulnerability was named CVE-2022-20713 since 11/02/2021. Successful exploitation requires user interaction by the victim. 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 08/13/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• ASA
• Firepower Threat Defense

License

• commercial

Website

• Vendor: https://www.cisco.com/

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