High severity · published Dec 31, 2019
CVE-2019-20175
An issue was discovered in ide_dma_cb() in hw/ide/core.c in QEMU 2.4.0 through 4.2.0
7.5
CVSS
3.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.4% · higher than 89% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QE
Qemu · Qemu
2.4.0 through 4.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-20175
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-20175
Exploit
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.html
Mailing List
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.html
Third Party Advisory
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.html
Mailing List
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
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