Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immediately crash the Internet Group Management Protocol (IGMP) process or make it consume available memory and eventually crash. The memory consumption may negatively impact other processes that are running on the device. These vulnerabilities are due to the incorrect handling of IGMP packets. An attacker could exploit these vulnerabilities by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to immediately crash the IGMP process or cause memory exhaustion, resulting in other processes becoming unstable. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address these vulnerabilities.
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ios_xr | Cisco | 6.1.4 (including) | 6.1.4 (including) |
| Ios_xr | Cisco | 6.2.3 (including) | 6.2.3 (including) |
| Ios_xr | Cisco | 6.3.3 (including) | 6.3.3 (including) |
| Ios_xr | Cisco | 6.4.2 (including) | 6.4.2 (including) |
| Ios_xr | Cisco | 6.5.3 (including) | 6.5.3 (including) |
| Ios_xr | Cisco | 6.6.2 (including) | 6.6.2 (including) |
| Ios_xr | Cisco | 6.6.3 (including) | 6.6.3 (including) |
| Ios_xr | Cisco | 7.0.2 (including) | 7.0.2 (including) |
| Ios_xr | Cisco | 7.1.2 (including) | 7.1.2 (including) |
| Ios_xr | Cisco | 7.1.15 (including) | 7.1.15 (including) |
Limited resources include memory, file system storage, database connection pool entries, and CPU. If an attacker can trigger the allocation of these limited resources, but the number or size of the resources is not controlled, then the attacker could cause a denial of service that consumes all available resources. This would prevent valid users from accessing the product, and it could potentially have an impact on the surrounding environment. For example, a memory exhaustion attack against an application could slow down the application as well as its host operating system. There are at least three distinct scenarios which can commonly lead to resource exhaustion:
Resource exhaustion problems are often result due to an incorrect implementation of the following situations:
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.