A vulnerability in the web interface of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to a lack of proper input validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. An exploit could allow the attacker to cause a DoS condition. Note: This vulnerability applies to IP Version 4 (IPv4) and IP Version 6 (IPv6) HTTP traffic.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Adaptive_security_appliance | Cisco | * | 9.6.4.45 (excluding) |
| Firepower_threat_defense | Cisco | * | 6.3.0.6 (excluding) |
| Firepower_threat_defense | Cisco | 6.4.0 (including) | 6.4.0.10 (excluding) |
| Firepower_threat_defense | Cisco | 6.5.0 (including) | 6.5.0.5 (excluding) |
| Firepower_threat_defense | Cisco | 6.6.0 (including) | 6.6.1 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.8.0 (including) | 9.8.4.22 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.9.0 (including) | 9.9.2.80 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.10.0 (including) | 9.10.1.44 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.12.0 (including) | 9.12.3.12 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.13.0 (including) | 9.13.1.12 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.14.0 (including) | 9.14.1.10 (excluding) |
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.