CVE-2018-20250

Estado: AnalizadaAlta (7.8)⚠ Explotación activa💥 Exploit

In WinRAR versions prior to and including 5.61, There is path traversal vulnerability when crafting the filename field of the ACE format (in UNACEV2.dll). When the filename field is manipulated with specific patterns, the destination (extraction) folder is ignored, thus treating the filename as an absolute path.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 96%
Percentil entre todas las CVEs puntuadas: 100
Fecha de la puntuación: 6/10/2026

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

Añadida al catálogo: 15/2/2022
Plazo de remediación: 15/8/2022
Uso conocido en ransomware: Known

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

Módulo de Metasploit (exploit fiable y al alcance de cualquiera) · RARLAB WinRAR ACE Format Input Validation Remote Code Execution
Publicado en Exploit-DB · RARLAB WinRAR 5.61 - ACE Format Input Validation Remote Code Execution (Metasploit) (25/4/2019)
Publicado en Exploit-DB · WinRAR 5.61 - Path Traversal (22/2/2019)
Prueba de concepto en GitHub (no verificada) · Lista de pruebas de concepto en GitHub

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

🎯 Técnicas ATT&CK

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

ExplotaciónT1203 Exploitation for Client Executionexecution75 %
Impacto principalT1005 Data from Local Systemcollection85 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact70 %

Explotación local con interacción del usuario (UI:R) en WinRAR para escalar privilegios vía path traversal (CWE-22). Permite lectura de archivos arbitrarios (T1005) y potencial manipulación al extraer fuera del directorio destino (T1565.001). Ransomware activo confirma impacto.

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

Restrict File and Directory Permissions Remote Data Storage Encrypt Sensitive Information Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Rarlab — Winrar

CWE

CWE-36
CWE-22

Referencias

JSON original (NVD)

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