CVE-2021-20181

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-20181
A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 0.8 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

6.9 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:L/AC:M/Au:N/C:C/I:C/A:C

Exploitability : 3.4 / Impact : 10.0

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References
Link Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1927007 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20210720-0009/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-159/ Third Party Advisory VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1927007 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20210720-0009/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-159/ Third Party Advisory VDB Entry
Configurations

Configuration 1 (hide)

cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
History

21 Nov 2024, 05:46

Type Values Removed Values Added
References () https://bugzilla.redhat.com/show_bug.cgi?id=1927007 - Issue Tracking, Patch, Third Party Advisory () https://bugzilla.redhat.com/show_bug.cgi?id=1927007 - Issue Tracking, Patch, Third Party Advisory
References () https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html - Mailing List, Third Party Advisory () https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html - Mailing List, Third Party Advisory
References () https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html - Mailing List, Third Party Advisory () https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html - Mailing List, Third Party Advisory
References () https://security.netapp.com/advisory/ntap-20210720-0009/ - Third Party Advisory () https://security.netapp.com/advisory/ntap-20210720-0009/ - Third Party Advisory
References () https://www.zerodayinitiative.com/advisories/ZDI-21-159/ - Third Party Advisory, VDB Entry () https://www.zerodayinitiative.com/advisories/ZDI-21-159/ - Third Party Advisory, VDB Entry

05 Sep 2022, 06:15

Type Values Removed Values Added
References
  • (MLIST) https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html -

05 Aug 2022, 16:00

Type Values Removed Values Added
CWE CWE-416
CWE-367		 CWE-362

26 Apr 2022, 17:15

Type Values Removed Values Added
References
  • (CONFIRM) https://security.netapp.com/advisory/ntap-20210720-0009/ - Third Party Advisory

04 Jun 2021, 17:05

Type Values Removed Values Added
References (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1927007 - (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1927007 - Issue Tracking, Patch, Third Party Advisory
References (MISC) https://www.zerodayinitiative.com/advisories/ZDI-21-159/ - (MISC) https://www.zerodayinitiative.com/advisories/ZDI-21-159/ - Third Party Advisory, VDB Entry
References (MLIST) https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html - (MLIST) https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html - Mailing List, Third Party Advisory
CPE cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CWE CWE-367
CWE-416
CVSS v2 : unknown
v3 : unknown 		v2 : 6.9
v3 : 7.5
Information

Published : 2021-05-13 16:15

Updated : 2024-11-21 05:46

NVD link : CVE-2021-20181

Mitre link : CVE-2021-20181

CVE.ORG link : CVE-2021-20181

JSON object : View

Products Affected

qemu

  • qemu

debian

  • debian_linux
CWE
CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')