CVE-2019-20175

high

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.

References

https://www.mail-archive.com/qemu-devel%40nongnu.org/msg667396.html

https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.html

https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.html

https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.html

Details

Source: Mitre, NVD

Published: 2019-12-31

Updated: 2024-05-17

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High