CVE-2021-20263
QEMU Virtio-fs xattrmap Capability Privilege Escalation Vulnerability
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.
INFO
Published Date :
March 9, 2021, 6:15 p.m.
Last Modified :
Sept. 30, 2022, 1:29 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
1.4
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-20263.
| URL | Resource |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1933668 | Issue Tracking Patch Third Party Advisory |
| https://security.gentoo.org/glsa/202208-27 | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20210507-0002/ | Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2021/03/08/1 | Mailing List Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-20263 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-20263 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Sep. 30, 2022
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/202208-27 No Types Assigned https://security.gentoo.org/glsa/202208-27 Third Party Advisory -
CVE Modified by [email protected]
Aug. 15, 2022
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202208-27 [No Types Assigned] -
Modified Analysis by [email protected]
Jan. 01, 2022
Action Type Old Value New Value Changed Reference Type https://security.netapp.com/advisory/ntap-20210507-0002/ No Types Assigned https://security.netapp.com/advisory/ntap-20210507-0002/ Third Party Advisory -
CVE Modified by [email protected]
May. 07, 2021
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20210507-0002/ [No Types Assigned] -
Reanalysis by [email protected]
Apr. 06, 2021
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* versions up to (excluding) 5.2.50 OR *cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (excluding) 5.2.50 -
Initial Analysis by [email protected]
Mar. 15, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1933668 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1933668 Issue Tracking, Patch, Third Party Advisory Changed Reference Type https://www.openwall.com/lists/oss-security/2021/03/08/1 No Types Assigned https://www.openwall.com/lists/oss-security/2021/03/08/1 Mailing List, Patch, Third Party Advisory Added CWE NIST CWE-281 Added CPE Configuration OR *cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* versions up to (excluding) 5.2.50
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-20263 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-20263
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.12212
percentile