CVE Vulnerabilities

CVE-2021-20263

Improper Preservation of Permissions

Published: Mar 09, 2021 | Modified: Sep 30, 2022
CVSS 3.x
3.3
LOW
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS 2.x
2.1 LOW
AV:L/AC:L/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
Ubuntu

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.

Weakness

The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.

Affected Software

Name Vendor Start Version End Version
Qemu Qemu 5.0.0 *

References