A vulnerability in the memory management of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management when connection rates are high. An attacker could exploit this vulnerability by opening a significant number of connections on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Firepower_threat_defense | Cisco | 6.4.0 (including) | 6.4.0.13 (excluding) |
| Firepower_threat_defense | Cisco | 6.6.0 (including) | 6.6.5 (excluding) |
| Firepower_threat_defense | Cisco | 6.7.0 (including) | 6.7.0.3 (excluding) |
| Firepower_threat_defense | Cisco | 7.0.0 (including) | 7.0.1 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.8.0 (including) | 9.8.4.40 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.12.0 (including) | 9.12.4.29 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.14.0 (including) | 9.14.3.9 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.15.0 (including) | 9.15.1.17 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.16.0 (including) | 9.16.2.3 (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.