CVE-2019-20175

HIGH

QEMU 2.4.0-4.2.0 - Denial of Service via SCSI_IOCTL_SEND_COMMAND

Title source: llm
STIX 2.1

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 (5)

Core 5
Core References
Exploit, Mailing List, Third Party Advisory x_refsource_misc
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.html
Mailing List, Patch, Third Party Advisory x_refsource_misc
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.html
Mailing List, Third Party Advisory x_refsource_misc
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.html

Scores

CVSS v3 7.5
EPSS 0.0054
EPSS Percentile 67.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-754
Status published
Products (1)
qemu/qemu 2.4.0 - 4.2.0
Published Dec 31, 2019
Tracked Since Feb 18, 2026