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CVE-2021-41773

Estado: AnalizadaCrítica (9.8)⚠ Explotación activa

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

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.

Path traversal (CWE-22) en Apache 2.4.49 expuesto en red (AV:N/PR:N) permite mapear URLs a archivos externos; si CGI habilitado, RCE. Impactos: ejecución de comandos, lectura de datos, modificación de contenido.

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

Vulnerability ScanningRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data StorageNetwork SegmentationLimit Access to Resource Over Network

Tecnologías afectadas (4)

Apache — Http ServerFedoraproject — FedoraNetapp — Cloud BackupOracle — Instantis Enterprisetrack

CWE

Referencias

JSON original (NVD)

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      "value": "A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration \"require all denied\", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013."
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      "value": "Se ha encontrado un fallo en un cambio realizado en la normalización de rutas en Apache HTTP Server 2.4.49. Un atacante podría utilizar un ataque de recorrido para asignar URLs a archivos fuera de los directorios configurados por las directivas tipo Alias. Si los archivos fuera de estos directorios no están protegidos por la configuración habitual por defecto \"require all denied\", estas peticiones pueden tener éxito. Si los scripts CGI también están habilitados para estas rutas alias, esto podría permitir la ejecución remota de código. Se sabe que este problema ha sido explotado en la naturaleza. Este problema sólo afecta a Apache 2.4.49 y no a versiones anteriores. La corrección en Apache HTTP Server 2.4.50 es incompleta, véase CVE-2021-42013"
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}