CVE-2019-20175

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.54%
Third-Party Advisory nongnu.org Third-Party Advisory nongnu.org Third-Party Advisory nongnu.org Third-Party Advisory nongnu.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.html mailing list third party advisory exploit
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.html third party advisory
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.html patch mailing list third party advisory
https://www.mail-archive.com/qemu-devel%40nongnu.org/msg667396.html
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2019-20175?
CVE-2019-20175 has been scored as a high severity vulnerability.
How to fix CVE-2019-20175?
To fix CVE-2019-20175, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-20175 being actively exploited in the wild?
It is possible that CVE-2019-20175 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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