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PrintNightmare — Provides PowerShell and batch scripts to back up, restore, and adjust Access Control Lists (ACLs) mitigating PrintNightmare Print Spooler vulnerabilities CVE-2021-34527 and CVE-2021-1675. | Kitploit
Tools/GitHubGitHub/twi1ight00/printnightmare
Defensive ToolsVulnerability AnalysisConfiguration AuditingIncident Response
GitHubtwi1ight00/printnightmare

PrintNightmare

Provides PowerShell and batch scripts to back up, restore, and adjust Access Control Lists (ACLs) mitigating PrintNightmare Print Spooler vulnerabilities CVE-2021-34527 and CVE-2021-1675.

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2215 years agoNot yet reviewed

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Critical Vulnerability

PrintNightmare CVE-2021-1675, CVE-2021-34527

Currently no solution from Microsoft yet (as of 02.07.2021)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527

Affects all operating system versions (server and client)

Options

  • Disable Print Spooler
  • Adjust ACL
  • Event ID
  • Removal of Authenticated Users from Pre-Windows 2000 Compatible Access

Adjusting the ACL is currently the more promising solution.
There are two scripts, POWERSHELL and BATCH/CMD. The batch variant has the advantage
that backup/restore of all ACLs is easily possible with it.

Links

https://github.com/LaresLLC/CVE-2021-1675
https://doublepulsar.com/zero-day-for-every-supported-windows-os-version-in-the-wild-printnightmare-b3fdb82f840c
https://blog.truesec.com/2021/06/30/fix-for-printnightmare-cve-2021-1675-exploit-to-keep-your-print-servers-running-while-a-patch-is-not-available/

German-language articles
https://www.borncity.com/blog/2021/07/02/windows-print-spooler-schwachstelle-cve-2021-1675-printnightmare-von-ms-besttigt-cisa-warnt/
https://www.heise.de/news/Jetzt-handeln-Angreifer-nutzen-die-Drucker-Luecke-in-Windows-bereits-aus-6127265.html

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