A vulnerability in the TCP packet processing of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a memory exhaustion condition. An attacker could exploit this vulnerability by sending a high rate of crafted TCP traffic through an affected device. A successful exploit could allow the attacker to exhaust device resources, resulting in a DoS condition for traffic transiting the affected device.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Adaptive_security_appliance | Cisco | * | 9.12.4.3 (excluding) |
| Firepower_threat_defense | Cisco | * | 6.2.2 (including) |
| Firepower_threat_defense | Cisco | 6.3.0 (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) | 6.6.0 (including) |
| Adaptive_security_appliance_software | Cisco | 9.13.0 (including) | 9.13.1.13 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.14.0 (including) | 9.14.1.30 (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.