Denial of Service in Cisco Secure Firewall ASA and FTD Software

Executive Summary

This is a high-severity vulnerability in Cisco Secure Firewall ASA and FTD Software's Remote Access SSL VPN service. It allows an unauthenticated remote attacker to cause the device to reload unexpectedly by sending a specially crafted HTTP request. The issue stems from insufficient error checking during HTTP request processing.

Useful 0 Not Useful 0

Detection Guidance

To detect this vulnerability, monitor network traffic for unusual HTTP requests targeting the Remote Access SSL VPN service on Cisco ASA or FTD devices. Check for repeated reloads or crashes of the affected devices. Use Cisco's provided tools or logs to identify crafted HTTP requests. No specific commands are provided in the context.

Useful 0 Not Useful 0

Impact Analysis

If exploited, this vulnerability could cause your Cisco firewall device to crash and reload, resulting in a denial of service. This would disrupt network access, VPN connectivity, and security services until the device restarts. No authentication is required for exploitation.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by disrupting the availability of critical network security devices. A denial of service condition may lead to unauthorized access or data breaches if security controls are temporarily disabled. Organizations relying on Cisco ASA or FTD for VPN services must ensure timely patching to maintain compliance with these regulations.

Useful 0 Not Useful 0

Mitigation Strategies

Immediately upgrade to the fixed software releases provided by Cisco for ASA and FTD Software. Disable the Remote Access SSL VPN service if an upgrade is not immediately possible. Monitor for exploitation attempts and apply hotfixes as recommended by Cisco.

Useful 0 Not Useful 0