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CVE-2025-34078

Estado: ModificadaAlta (7.3)—

A local privilege escalation vulnerability exists in NSClient++ 0.5.2.35 when both the web interface and ExternalScripts features are enabled. The configuration file (nsclient.ini) stores the administrative password in plaintext and is readable by local users. By extracting this password, an attacker can authenticate to the NSClient++ web interface (typically accessible on port 8443) and abuse the ExternalScripts plugin to inject and execute arbitrary commands as SYSTEM by registering a custom script, saving the configuration, and triggering it via the API.

This behavior is documented but insecure, as the plaintext credential exposure undermines access isolation between local users and administrative functions.

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).

🎯 Técnicas ATT&CK

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

Escalada de privilegios local: credencial plaintext en nsclient.ini (T1552.001) permite autenticación web y ejecución de comandos arbitrarios como SYSTEM (T1059) con permisos elevados (T1548.002). AV:L, PR:L confirman T1068.

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

AuditPrivileged Account ManagementExecution PreventionUpdate SoftwareUser TrainingThreat Intelligence Program

Tecnologías afectadas (1)

Nsclient — Nsclient++

CWE

Referencias

JSON original (NVD)

Mostrar
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      "value": "A local privilege escalation vulnerability exists in NSClient++ 0.5.2.35 when both the web interface and ExternalScripts features are enabled. The configuration file (nsclient.ini) stores the administrative password in plaintext and is readable by local users. By extracting this password, an attacker can authenticate to the NSClient++ web interface (typically accessible on port 8443) and abuse the ExternalScripts plugin to inject and execute arbitrary commands as SYSTEM by registering a custom script, saving the configuration, and triggering it via the API.\n\nThis behavior is documented but insecure, as the plaintext credential exposure undermines access isolation between local users and administrative functions."
    },
    {
      "lang": "es",
      "value": "Existe una vulnerabilidad de escalada de privilegios local en NSClient++ 0.5.2.35 cuando tanto la interfaz web como las funciones de ExternalScripts están habilitadas. El archivo de configuración (nsclient.ini) almacena la contraseña administrativa en texto plano y es legible para los usuarios locales. Al extraer esta contraseña, un atacante puede autenticarse en la interfaz web de NSClient++ (normalmente accesible en el puerto 8443) y abusar del complemento ExternalScripts para inyectar y ejecutar comandos arbitrarios como SYSTEM. Para ello, registra un script personalizado, guarda la configuración y lo activa mediante la API. Este comportamiento está documentado, pero es inseguro, ya que la exposición de las credenciales en texto plano vulnera el aislamiento de acceso entre los usuarios locales y las funciones administrativas."
    }
  ],
  "lastModified": "2026-06-17T09:13:26.040",
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