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CVE-2021-45046

Estado: AnalizadaCrítica (9)⚠ Explotación activa

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N sin autenticación permite explotación remota de Log4j (T1190). JNDI Lookup + MDC permite RCE (T1059.007) e información leak (T1005). Ransomware confirmado en KEV.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Tecnologías afectadas (55)

Apache — Log4jCvat — Computer Vision Annotation ToolDebian — Debian LinuxFedoraproject — FedoraIntel — Audio Development KITIntel — Datacenter ManagerIntel — Genomics Kernel LibraryIntel — OneapiIntel — Secure Device OnboardIntel — Sensor Solution Firmware Development KITIntel — System DebuggerIntel — System StudioSiemens — 6bk1602-0aa12-0tp0 FirmwareSiemens — 6bk1602-0aa22-0tp0 FirmwareSiemens — 6bk1602-0aa32-0tp0 FirmwareSiemens — 6bk1602-0aa42-0tp0 FirmwareSiemens — 6bk1602-0aa52-0tp0 FirmwareSiemens — CaptialSiemens — ComosSiemens — Desigo CC Advanced ReportsSiemens — Desigo CC Info CenterSiemens — E-car Operation CenterSiemens — Energy EngageSiemens — EnergyipSiemens — Energyip PrepaySiemens — Gma-managerSiemens — Head-end System Universal Device Integration SystemSiemens — Industrial Edge ManagementSiemens — Industrial Edge Management HUBSiemens — Logo! Soft ComfortSiemens — MendixSiemens — MindsphereSiemens — NavigatorSiemens — NXSiemens — Opcenter IntelligenceSiemens — Operation SchedulerSiemens — Sentron PowermanagerSiemens — Siguard DSASiemens — Sipass IntegratedSiemens — Siveillance CommandSiemens — Siveillance Control PROSiemens — Siveillance IdentitySiemens — Siveillance VantageSiemens — Siveillance ViewpointSiemens — Solid Edge CAM PROSiemens — Solid Edge Harness DesignSiemens — Spectrum Power 4Siemens — Spectrum Power 7Siemens — Sppa-t3000 Ses3000 FirmwareSiemens — TeamcenterSiemens — TracealertserverplusSiemens — VesysSiemens — Xpedition EnterpriseSiemens — Xpedition Package IntegratorSonicwall — Email Security

CWE

Referencias

JSON original (NVD)

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      "value": "Se descubrió que la corrección para abordar CVE-2021-44228 en Apache Log4j versiones 2.15.0 estaba incompleta en ciertas configuraciones no predeterminadas. Esto podría permitir a los atacantes con control sobre los datos de entrada de Thread Context Map (MDC) cuando la configuración de registro utiliza un Pattern Layout no predeterminado con un Context Lookup (por ejemplo, $${ctx:loginId}) o un Thread Context Map pattern (%X, %mdc, o %MDC) para elaborar datos de entrada maliciosos utilizando un patrón JNDI Lookup que resulta en una fuga de información y ejecución de código remoto en algunos entornos y ejecución de código local en todos los entornos. Log4j versiones 2.16.0 (Java 8) y 2.12.2 (Java 7) solucionan este problema eliminando el soporte para los patrones de búsqueda de mensajes y deshabilitando la funcionalidad JNDI por defecto"
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