Cisco ASA and FTD Software Cryptographic TLS and SSL Driver Denial of Service Vulnerability

Summary

A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly. The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An attacker could exploit this vulnerability by sending a crafted TLS/SSL packet to an interface on the targeted device. An exploit could allow the attacker to cause the device to reload, which will result in a denial of service (DoS) condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed and transparent firewall mode and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. A valid SSL or TLS session is required to exploit this vulnerability.

Credit:

The information has been provided by Cisco

The original article can be found at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190710-asa-ftd-dos


Details

A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly.

The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An attacker could exploit this vulnerability by sending a crafted TLS/SSL packet to an interface on the targeted device. An exploit could allow the attacker to cause the device to reload, which will result in a denial of service (DoS) condition.

Vulnerable Systems:

  • ASA 5506-X
  • ASA 5506-X with FirePOWER Services
  • ASA 5506H-X
  • ASA 5506H-X with FirePOWER Services
  • ASA 5506W-X
  • ASA 5506W-X with FirePOWER Services
  • ASA 5508-X
  • ASA 5508-X with FirePOWER Services
  • ASA 5516-X
  • ASA 5516-X with FirePOWER Services

CVE Information:

CVE-2019-1873

Disclosure Timeline:
Published Date:07/16/2019

Categories: News