Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Swiftnio | Apple | 1.0.0 (including) | 1.4.0 (including) |
| Red Hat AMQ | RedHat | jetty | * |
| Red Hat AMQ 7.4.3 | RedHat | jetty | * |
| Red Hat Data Grid 7.3.3 | RedHat | netty | * |
| Red Hat Decision Manager 7 | RedHat | netty | * |
| Red Hat Enterprise Linux 8 | RedHat | nodejs:10-8000020190911085529.f8e95b4e | * |
| Red Hat Fuse 6.3 | RedHat | netty | * |
| Red Hat Fuse 7.5.0 | RedHat | netty | * |
| Red Hat Fuse 7.6.0 | RedHat | undertow | * |
| Red Hat Process Automation 7 | RedHat | netty | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs10-0:3.2-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs10-nodejs-0:10.16.3-3.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs8-0:3.0-5.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-nodejs8-nodejs-0:8.16.1-2.el7 | * |
| Netty | Ubuntu | bionic | * |
| Netty | Ubuntu | disco | * |
| Netty | Ubuntu | eoan | * |
| Netty | Ubuntu | esm-apps/bionic | * |
| Netty | Ubuntu | groovy | * |
| Netty | Ubuntu | hirsute | * |
| Netty | Ubuntu | impish | * |
| Netty | Ubuntu | kinetic | * |
| Netty | Ubuntu | lunar | * |
| Netty | Ubuntu | mantic | * |
| Netty | Ubuntu | trusty | * |
| Netty | Ubuntu | upstream | * |
| Trafficserver | Ubuntu | bionic | * |
| Trafficserver | Ubuntu | groovy | * |
| Trafficserver | Ubuntu | hirsute | * |
| Trafficserver | Ubuntu | impish | * |
| Trafficserver | Ubuntu | kinetic | * |
| Trafficserver | Ubuntu | lunar | * |
| Trafficserver | Ubuntu | mantic | * |
| Trafficserver | Ubuntu | oracular | * |
| Trafficserver | Ubuntu | trusty | * |
| Trafficserver | Ubuntu | xenial | * |
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.