Improper Preservation of Permissions Affecting qemu package, versions <1:5.2+dfsg-9


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.05% (18th percentile)

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  • Snyk IDSNYK-DEBIAN12-QEMU-1558357
  • published3 Mar 2021
  • disclosed9 Mar 2021

Introduced: 3 Mar 2021

CVE-2021-20263  (opens in a new tab)
CWE-281  (opens in a new tab)

How to fix?

Upgrade Debian:12 qemu to version 1:5.2+dfsg-9 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:12 relevant fixed versions and status.

A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.

CVSS Scores

version 3.1