CVE-2019-20175 — An issue was discovered in ide_dma_cb() in hw/ide/core
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
Published
2019-12-31T03:27:40.000Z
Last modified
2024-08-05T02:39:09.821Z
01What is this vulnerability?
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…
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2019-12-31T03:27:40.000Z
- Last modified: 2024-08-05T02:39:09.821Z
09References
- lists.nongnu.org — https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.html
- lists.nongnu.org — https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.html
- lists.nongnu.org — https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.html
- www.mail-archive.com — https://www.mail-archive.com/qemu-devel%40nongnu.org/msg667396.html
- lists.nongnu.org — https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.html
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