Improper Check for Unusual or Exceptional Conditions Affecting qemu package, versions <1:5.0-1


low

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.17% (53rd percentile)
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NVD
7.5 high

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  • Snyk ID SNYK-DEBIANUNSTABLE-QEMU-540345
  • published 31 Dec 2019
  • disclosed 31 Dec 2019

How to fix?

Upgrade Debian:unstable qemu to version 1:5.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.