CVE-2017-7539 Denial of service in Qemu
A remote attacker can crash the QEMU NBD server by sending unexpected data during connection negotiation, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-7539?
CVE-2017-7539 is a medium-severity denial of service vulnerability in Qemu Qemu, published on 26 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An assertion-failure flaw was found in Qemu before 2.10.1, in the Network Block Device (NBD) server's initial connection negotiation, where the I/O coroutine was undefined. This could crash the qemu-nbd server if a client sent unexpected data during connection negotiation. A remote user or process could use this flaw to crash the qemu-nbd server resulting in denial of service.
Which versions are affected by CVE-2017-7539?
It affects 3 products.
Linux distribution packages (5)
qemu-img-rhev Red Hat:enterprise_linux:7::hypervisor | All versions | 10:2.9.0-16.el7_4.5 |
qemu-kvm-common-rhev Red Hat:enterprise_linux:7::hypervisor | All versions | 10:2.9.0-16.el7_4.5 |
qemu-kvm-rhev Red Hat:enterprise_linux:7::hypervisor | All versions | 10:2.9.0-16.el7_4.5 |
qemu-kvm-rhev-debuginfo Red Hat:enterprise_linux:7::hypervisor | All versions | 10:2.9.0-16.el7_4.5 |
qemu-kvm-tools-rhev Red Hat:enterprise_linux:7::hypervisor | All versions | 10:2.9.0-16.el7_4.5 |
Products include Qemu Qemu, Redhat Openstack, Redhat Virtualization.
How do I fix CVE-2017-7539?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-7539 being exploited?
There is no known exploitation of CVE-2017-7539 in the wild and no public exploit code.
Other vulnerabilities in Qemu Qemu
Sources
Also known as GHSA-8vvg-hj6f-q4wj, RHSA-2017:2628.