CVE-2021-36934
Windows Elevation of Privilege Vulnerability
At a glance
- Source
- NVD
- EPSS
- EPSS 67.25 % · percentile 99 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934
- https://www.kb.cert.org/vuls/id/506989
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934
- http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36934
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:T/RC:C | microsoft |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · secure@microsoft.com (Secondary) |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Secondary) |
| CVSS 2.0 | MEDIUM 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2021-23510
- GCVE · GCVE-0-2021-36934
CERT-FR advisories
- CERTFR-2021-AVI-624 — Vulnérabilité dans Microsoft Windows · cert.ssi.gouv.fr
- CERTFR-2021-AVI-575 — Vulnérabilité dans Microsoft Windows · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*< 10.0.17763.2114cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*< 10.0.18363.1734cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*< 10.0.19041.1165cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*< 10.0.19042.1165cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*< 10.0.19043.1165
Affected products
| Product | Versions |
|---|---|
| Microsoft · Windows 10 Version 1809 | affected 10.0.17763.0 < 10.0.17763.2114 |
| Microsoft · Windows 10 Version 1809 | affected 10.0.0 < 10.0.17763.2114 |
| Microsoft · Windows 10 Version 1909 | affected 10.0.0 < 10.0.18363.1734 |
| Microsoft · Windows 10 Version 2004 | affected 10.0.0 < 10.0.19041.1165 |
| Microsoft · Windows 10 Version 20H2 | affected 10.0.0 < 10.0.19042.1165 |
| Microsoft · Windows 10 Version 21H1 | affected 10.0.0 < 10.0.19043.1165 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |