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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – < 10.0.17763.2114, 10.0.0 – < 10.0.17763.2114 | 10.0.17763.2114 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – < 10.0.18363.1734 | 10.0.18363.1734 |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – < 10.0.19041.1165 | 10.0.19041.1165 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – < 10.0.19042.1165 | 10.0.19042.1165 |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 – < 10.0.19043.1165 | 10.0.19043.1165 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 24 repositories · most starred shown
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HuskyHacks/ShadowSteal ★ 208 · Jul 20, 2021
Pure Nim implementation for exploiting CVE-2021-36934, the SeriousSAM local privilege escalation
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WiredPulse/Invoke-HiveNightmare ★ 35 · Jul 22, 2021
PoC for CVE-2021-36934, which enables a standard user to be able to retrieve the SAM, Security, and Software Registry hives in Windows 10 version 1809 or newer
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romarroca/SeriousSam ★ 9 · Jul 22, 2021
HiveNightmare a.k.a. SeriousSam Local Privilege Escalation in Windows – CVE-2021-36934
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JoranSlingerland/CVE-2021-36934 ★ 9 · Jul 21, 2021
Fix for the CVE-2021-36934
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Wh04m1001/VSSCopy ★ 8 · Jul 22, 2021
Small and dirty PoC for CVE-2021-36934
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exploitblizzard/CVE-2021-36934 ★ 7 · Jul 27, 2021
HiveNightmare aka SeriousSAM
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Sp00kySkelet0n/PyNightmare ★ 7 · Jul 25, 2021
PoC for CVE-2021-36934 Aka HiveNightmare/SeriousSAM written in python3
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n3tsurge/CVE-2021-36934 ★ 5 · Jul 21, 2021
Detection and Mitigation script for CVE-2021-36934 (HiveNightmare aka. SeriousSam)
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chron1k/oxide_hive ★ 3 · Aug 12, 2021
Exploit for CVE-2021-36934
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Preventions/CVE-2021-36934 ★ 3 · Jul 24, 2021
C# PoC for CVE-2021-36934/HiveNightmare/SeriousSAM
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- MSRC-CVE-2021-36934 Windows Elevation of Privilege Vulnerability Microsoft Security Response Center · Aug 12, 2021
References
- Windows Elevation of Privilege Vulnerability vendor-advisory patch