libvirt version before 4.2.0-rc1 is vulnerable to a resource exhaustion as a result of an incomplete fix for CVE-2018-5748 that affects QEMU monitor but now also triggered via QEMU guest agent.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Debian_linux | Debian | 7.0 (including) | 7.0 (including) |
| Debian_linux | Debian | 8.0 (including) | 8.0 (including) |
| Debian_linux | Debian | 9.0 (including) | 9.0 (including) |
| Red Hat Enterprise Linux 6 | RedHat | libvirt-0:0.10.2-64.el6 | * |
| Red Hat Enterprise Linux 7 | RedHat | libvirt-0:3.9.0-14.el7_5.4 | * |
| Red Hat Storage 3 for RHEL 6 | RedHat | libvirt-0:0.10.2-64.el6 | * |
| Libvirt | Ubuntu | artful | * |
| Libvirt | Ubuntu | bionic | * |
| Libvirt | Ubuntu | esm-infra-legacy/trusty | * |
| Libvirt | Ubuntu | esm-infra/bionic | * |
| Libvirt | Ubuntu | esm-infra/xenial | * |
| Libvirt | Ubuntu | precise/esm | * |
| Libvirt | Ubuntu | trusty | * |
| Libvirt | Ubuntu | trusty/esm | * |
| Libvirt | Ubuntu | upstream | * |
| Libvirt | 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.