Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Qemu | Qemu | >= 2.4.0, <= 4.2.0 |
Related Weaknesses (CWE)
References
- https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.htmlExploitMailing ListThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.htmlMailing ListThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.htmlThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.htmlMailing ListPatchThird Party Advisory
- https://www.mail-archive.com/qemu-devel%40nongnu.org/msg667396.html
- https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.htmlExploitMailing ListThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.htmlMailing ListThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.htmlThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.htmlMailing ListPatchThird Party Advisory
- https://www.mail-archive.com/qemu-devel%40nongnu.org/msg667396.html
FAQ
What is CVE-2019-20175?
CVE-2019-20175 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 a...
How severe is CVE-2019-20175?
CVE-2019-20175 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-20175?
Check the references section above for vendor advisories and patch information. Affected products include: Qemu Qemu.