CVE-2019-20175 describes a denial-of-service vulnerability in QEMU versions 2.4.0 through 4.2.0, specifically within the ide_dma_cb() function in hw/ide/core.c. A privileged guest user can crash the QEMU process on the host system by sending a specially crafted SCSI_IOCTL_SEND_COMMAND, triggering an assertion related to DMA transfer sizes. This vulnerability carries a CVSS v3.1 score of 7.5 (High), indicating a network-exploitable issue with low attack complexity that can lead to high availability impact. Despite its severity, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.4.0, <= 4.2.0CPE matchmatch criteria | cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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CVE-2019-20175
Aug 11, 2020An 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.
Dec 10, 2019