quic-go through 0.27.0 allows remote attackers to cause a denial of service (CPU consumption) via a Slowloris variant in which incomplete QUIC or HTTP/3 requests are sent. This occurs because mtu_discoverer.go misparses the MTU Discovery service and consequently overflows the probe timer. NOTE: the vendors position is that this behavior should not be listed as a vulnerability on the CVE List
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Quic-go | Quic-go_project | * | 0.27.0 (including) |
| Golang-github-lucas-clemente-quic-go | Ubuntu | impish | * |
| Golang-github-lucas-clemente-quic-go | Ubuntu | kinetic | * |
| Golang-github-lucas-clemente-quic-go | Ubuntu | lunar | * |
| Golang-github-lucas-clemente-quic-go | Ubuntu | mantic | * |
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.