PT-2021-7336 · Qemu+3 · Qemu+3

Dr. David Alan Gilbert · Published 2021-02-09 · Updated 2024-06-15 · CVE-2021-20263

Positive Technologies (AI Summary)

CVSS v3.1

3.3

Low

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions QEMU (affected versions not specified)

Description 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.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Preservation of Permissions

Weakness Enumeration

CWE-281

Related Identifiers

ALT-PU-2021-1767

BDU:2022-05711

CVE-2021-20263

OPENSUSE-SU-2021:1942-1

OPENSUSE-SU-2021_1942-1

OPENSUSE-SU-2024:11287-1

SUSE-SU-2021:1942-1

Affected Products

Alt Linux

Astra Linux

Qemu

Suse

References · 179

• https://openwall.com/lists/oss-security/2021/03/08/1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-20263 · Security Note
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2022-0819SE17 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1933668 · Patch
• https://security.gentoo.org/glsa/202208-27 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:1942-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-20263 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11287-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:1942-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-05711 · Security Note
• https://osv.dev/vulnerability/CVE-2021-20263 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-20263 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2022-0926SE47 · Vendor Advisory
• https://suse.com/security/cve/CVE-2020-11102 · Note
• https://bugzilla.suse.com/1179477 · Note