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CVE-2021-20263

Date: March 9, 2021

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.

Language: C

Severity Score

Related Resources (8)

https://bugzilla.redhat.com/show_bug.cgi?id=1933668
https://security.netapp.com/advisory/ntap-20210507-0002/
https://security-tracker.debian.org/tracker/CVE-2021-20263
https://security.gentoo.org/glsa/202208-27
https://nvd.nist.gov/vuln/detail/CVE-2021-20263
https://access.redhat.com/security/cve/CVE-2021-20263
https://www.openwall.com/lists/oss-security/2021/03/08/1
https://www.mend.io/vulnerability-database/CVE-2021-20263

Severity Score

Weakness Type (CWE)

Improper Preservation of Permissions

CWE-281

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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