A vulnerability in Juniper Networks Junos OS ACX500 Series, ACX4000 Series, may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a Forwarding Engine Board (FFEB) crash. Continued receipt of these packets will sustain the Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on ACX500 Series, ACX4000 Series: 17.4 versions prior to 17.4R3-S2.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Junos | Juniper | 17.4 (including) | 17.4 (including) |
| Junos | Juniper | 17.4-r1 (including) | 17.4-r1 (including) |
| Junos | Juniper | 17.4-r1-s1 (including) | 17.4-r1-s1 (including) |
| Junos | Juniper | 17.4-r1-s2 (including) | 17.4-r1-s2 (including) |
| Junos | Juniper | 17.4-r1-s3 (including) | 17.4-r1-s3 (including) |
| Junos | Juniper | 17.4-r1-s4 (including) | 17.4-r1-s4 (including) |
| Junos | Juniper | 17.4-r1-s5 (including) | 17.4-r1-s5 (including) |
| Junos | Juniper | 17.4-r1-s6 (including) | 17.4-r1-s6 (including) |
| Junos | Juniper | 17.4-r1-s7 (including) | 17.4-r1-s7 (including) |
| Junos | Juniper | 17.4-r2 (including) | 17.4-r2 (including) |
| Junos | Juniper | 17.4-r2-s1 (including) | 17.4-r2-s1 (including) |
| Junos | Juniper | 17.4-r2-s10 (including) | 17.4-r2-s10 (including) |
| Junos | Juniper | 17.4-r2-s11 (including) | 17.4-r2-s11 (including) |
| Junos | Juniper | 17.4-r2-s2 (including) | 17.4-r2-s2 (including) |
| Junos | Juniper | 17.4-r2-s3 (including) | 17.4-r2-s3 (including) |
| Junos | Juniper | 17.4-r2-s4 (including) | 17.4-r2-s4 (including) |
| Junos | Juniper | 17.4-r2-s5 (including) | 17.4-r2-s5 (including) |
| Junos | Juniper | 17.4-r2-s6 (including) | 17.4-r2-s6 (including) |
| Junos | Juniper | 17.4-r2-s7 (including) | 17.4-r2-s7 (including) |
| Junos | Juniper | 17.4-r2-s8 (including) | 17.4-r2-s8 (including) |
| Junos | Juniper | 17.4-r2-s9 (including) | 17.4-r2-s9 (including) |
| Junos | Juniper | 17.4-r3 (including) | 17.4-r3 (including) |
| Junos | Juniper | 17.4-r3-s1 (including) | 17.4-r3-s1 (including) |
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.