CVE-2021-34527highbajo ataqueransomware

CVE-2021-34527: fallo de gravedad alta en Microsoft Windows Server 2012

Windows Print Spooler Remote Code Execution Vulnerability

Publicada el · Actualizada el

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100Vexday Risk Score

Corrige ahora. Ella está bajo explotación confirmada por CISA y tiene exploit funcional público.

ssvc Actcvss 8.8epss 100%
de la publicación al armael mismo día
Publicada en NVD2 jul
1ª PoC29 jun
metasploit8 jun
CISA KEV+124d
Acción exigida por CISAplazo federal: 2022-05-03

Apply updates per vendor instructions.

En resumen

El servicio Administrador de colas de impresión de Windows tiene una falla que permite a los atacantes ejecutar código malicioso con los máximos privilegios del sistema, comprometiendo potencialmente toda la computadora. Esto es crítico porque puede explotarse remotamente para instalar malware, robar datos o crear cuentas de administrador no autorizadas.

Detalle técnico

Una vulnerabilidad de ejecución remota de código en el servicio Windows Print Spooler resulta del manejo inadecuado de operaciones de archivos privilegiadas. Un atacante no autenticado puede explotar esto remotamente para ejecutar código arbitrario con privilegios SYSTEM; la explotación puede facilitarse mediante configuraciones inseguras de Group Policy (NoWarningNoElevationOnInstall=1 o UpdatePromptSettings=1).

Resumen generado y traducido por IA a partir de la descripción oficial.

El análisis completo de esta CVE está disponible en portugués →

A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. 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. UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. In addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (Note: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ): HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting) UpdatePromptSettings = 0 (DWORD) or not defined (default setting) Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design. UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates. Note that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Productos afectados
Microsoft · Windows 10 Version 1507Microsoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 20H2Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 version 21H2Microsoft · Windows 11 version 22H2Microsoft · Windows 8.1Microsoft · Windows Server 2008 R2 Service Pack 1Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)Microsoft · Windows Server 2008 Service Pack 2Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)Microsoft · Windows Server 2012Microsoft · Windows Server 2012 R2Microsoft · Windows Server 2012 R2 (Server Core installation)Microsoft · Windows Server 2012 (Server Core installation)Microsoft · Windows Server 2016Microsoft · Windows Server 2016 (Server Core installation)Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server version 20H2
PoCs públicas encontradas — 40
githubgithub.com/byt3bl33d3r/ItWasAllADream★ 801githubgithub.com/JohnHammond/CVE-2021-34527★ 318githubgithub.com/nemo-wq/PrintNightmare-CVE-2021-34527★ 173githubgithub.com/m8sec/CVE-2021-34527★ 118githubgithub.com/hackerhouse-opensource/cve-2021-34527★ 23githubgithub.com/Tomparte/PrintNightmare★ 3githubgithub.com/dywhoami/CVE-2021-34527-Scanner-Based-On-cube0x0-POC★ 3githubgithub.com/rdboboia/disable-RegisterSpoolerRemoteRpcEndPoint★ 2githubgithub.com/0xirison/PrintNightmare-Patcher★ 2githubgithub.com/powershellpr0mpt/PrintNightmare-CVE-2021-34527★ 2githubgithub.com/thomas-lauer/PrintNightmare★ 2githubgithub.com/Amaranese/CVE-2021-34527★ 1githubgithub.com/cyb3rpeace/CVE-2021-34527★ 1githubgithub.com/geekbrett/CVE-2021-34527-PrintNightmare-Workaround★ 0githubgithub.com/DenizSe/CVE-2021-34527★ 0githubgithub.com/vinaysudheer/Disable-Spooler-Service-PrintNightmare-CVE-2021-34527★ 0githubgithub.com/WidespreadPandemic/CVE-2021-34527_ACL_mitigation★ 0githubgithub.com/glorisonlai/printnightmare★ 0githubgithub.com/Eutectico/Printnightmare★ 0githubgithub.com/syntaxbearror/PowerShell-PrintNightmare★ 0githubgithub.com/fengjixuchui/CVE-2021-34527-1675★ 0githubgithub.com/d0rb/CVE-2021-34527★ 0githubgithub.com/TieuLong21Prosper/detect_bruteforce★ 0githubgithub.com/Hirusha-N/CVE-2021-34527-CVE-2023-38831-and-CVE-2023-32784★ 0githubgithub.com/AUSK1LL9/CVE-2021-34527★ 0githubgithub.com/AlDawli/CVE-2021-34527-★ 0vulncheckvulncheck.com/xdb/0544e277335eno verificadovulncheckvulncheck.com/xdb/aafd327559cbno verificadovulncheckvulncheck.com/xdb/5eef66f4123cno verificadovulncheckvulncheck.com/xdb/236b4901d545no verificadovulncheckvulncheck.com/xdb/a9a05728c824no verificadovulncheckvulncheck.com/xdb/f06e206bb116no verificadovulncheckvulncheck.com/xdb/66146f087766no verificadovulncheckvulncheck.com/xdb/f4a2f262c1e1no verificadovulncheckvulncheck.com/xdb/94dfa232ad84no verificadocve_referencepacketstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.htmlno verificadovulncheckvulncheck.com/xdb/7383b6febefano verificadovulncheckvulncheck.com/xdb/de7a76d51822no verificadovulncheckvulncheck.com/xdb/161c77693a74no verificadovulncheckvulncheck.com/xdb/8b8ea9fe1124no verificado
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