Cisco ASA/Firepower Threat Defense CP Proxy Function Packet Sequence input validation

Summaryinfo

A vulnerability categorized as problematic has been discovered in Cisco ASA and Firepower Threat Defense. The affected element is an unknown function of the component CP Proxy Function. Executing a manipulation as part of Packet Sequence can lead to input validation. This vulnerability appears as CVE-2019-1687. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in Cisco ASA and Firepower Threat Defense (Firewall Software) (affected version unknown) and classified as problematic. This vulnerability affects an unknown functionality of the component CP Proxy Function. The manipulation as part of a Packet Sequence leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. CVE summarizes:

A vulnerability in the TCP proxy functionality for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to an error in TCP-based packet inspection, which could cause the TCP packet to have an invalid Layer 2 (L2)-formatted header. An attacker could exploit this vulnerability by sending a crafted TCP packet sequence to the targeted device. A successful exploit could allow the attacker to cause a DoS condition.

The bug was discovered 05/01/2019. The weakness was presented 05/03/2019 as cisco-sa-20190501-asa-ftdtcp-d as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2019-1687 since 12/06/2018. 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 $5k-$25k at the moment (estimation calculated on 09/12/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316443 (Cisco Adaptive Security Appliance Software TCP Proxy Denial of Service Vulnerability(cisco-sa-20190501-asa-ftdtcp-dos)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

See VDB-134342, VDB-134341 and VDB-134340 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• ASA
• Firepower Threat Defense

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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