CVE-2019-20175 Denial of service in n/a
A privileged guest user can crash the QEMU host process via a specific SCSI command, 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-2019-20175?
CVE-2019-20175 is a high-severity denial of service vulnerability in Qemu Qemu, published on 31 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in ide_dma_cb() in hw/ide/core.c in QEMU 2.4.0 through 4.2.0. The guest system can crash the QEMU process in the host system via a special SCSI_IOCTL_SEND_COMMAND. It hits an assertion that implies that the size of successful DMA transfers there must be a multiple of 512 (the size of a sector). NOTE: a member of the QEMU security team disputes the significance of this issue because a "privileged guest user has many ways to cause similar DoS effect, without triggering this assert.
Weakness: CWE-754
Which versions are affected by CVE-2019-20175?
It affects 1 product.
Products include Qemu Qemu.
How do I fix CVE-2019-20175?
Apply the vendor's patch.
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-2019-20175 being exploited?
There is no known exploitation of CVE-2019-20175 in the wild and no public exploit code.
Other vulnerabilities in Qemu Qemu
Sources
Also known as DEBIAN-CVE-2019-20175, GHSA-4r96-hw22-hhc7.