Cisco ASAv/ASA/Firepower 2100 Cryptography denial of service

Summaryinfo

A vulnerability was found in Cisco ASAv, ASA and Firepower 2100. It has been declared as problematic. The impacted element is an unknown function of the component Cryptography Module. Executing a manipulation can lead to denial of service. This vulnerability is registered as CVE-2019-1706. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Cisco ASAv, ASA and Firepower 2100 (Firewall Software) (version now known). It has been declared as problematic. This vulnerability affects some unknown processing of the component Cryptography Module. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

A vulnerability in the software cryptography module of the Cisco Adaptive Security Virtual Appliance (ASAv) and Firepower 2100 Series running Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause an unexpected reload of the device that results in a denial of service (DoS) condition. The vulnerability is due to a logic error with how the software cryptography module handles IPsec sessions. An attacker could exploit this vulnerability by creating and sending traffic in a high number of IPsec sessions through the targeted device. A successful exploit could cause the device to reload and result in a DoS condition.

The bug was discovered 05/01/2019. The weakness was published 05/03/2019 as cisco-sa-20190501-asa-ipsec-do as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2019-1706 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). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

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 316446 (Cisco Adaptive Security Appliance Software IPsec Denial of Service Vulnerability(cisco-sa-20190501-asa-ipsec-dos)).

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

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Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• ASA
• ASAv
• Firepower 2100

License

• commercial

Website

• Vendor: https://www.cisco.com/

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