CVE-2019-20175

MEDIUM

Description

** DISPUTED ** 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://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.html

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

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

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

https://www.mail-archive.com/[email protected]/msg667396.html

Details

Source: MITRE

Published: 2019-12-31

Updated: 2020-01-15

Type: CWE-754

Risk Information

CVSS v2.0

Base Score: 5

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

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH