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CVE-2017-8415

Estado: ModificadaCrítica (9.8)—

An issue was discovered on D-Link DCS-1100 and DCS-1130 devices. The device has a custom telnet daemon as a part of the busybox and retrieves the password from the shadow file using the function getspnam at address 0x00053894. Then performs a crypt operation on the password retrieved from the user at address 0x000538E0 and performs a strcmp at address 0x00053908 to check if the password is correct or incorrect. However, the /etc/shadow file is a part of CRAM-FS filesystem which means that the user cannot change the password and hence a hardcoded hash in /etc/shadow is used to match the credentials provided by the user. This is a salted hash of the string "admin" and hence it acts as a password to the device which cannot be changed as the whole filesystem is read only.

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).

Tecnologías afectadas (2)

Dlink — Dcs-1100 FirmwareDlink — Dcs-1130 Firmware

CWE

Referencias

JSON original (NVD)

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      "value": "An issue was discovered on D-Link DCS-1100 and DCS-1130 devices. The device has a custom telnet daemon as a part of the busybox and retrieves the password from the shadow file using the function getspnam at address 0x00053894. Then performs a crypt operation on the password retrieved from the user at address 0x000538E0 and performs a strcmp at address 0x00053908 to check if the password is correct or incorrect. However, the /etc/shadow file is a part of CRAM-FS filesystem which means that the user cannot change the password and hence a hardcoded hash in /etc/shadow is used to match the credentials provided by the user. This is a salted hash of the string \"admin\" and hence it acts as a password to the device which cannot be changed as the whole filesystem is read only."
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      "value": "Se detectó un problema en los dispositivos DCS-1100 y DCS-1130 de D-Link. El dispositivo presenta un demonio telnet personalizado como parte de la busybox y recupera la contraseña del archivo instantáneo utilizando la función getspnam en la dirección 0x00053894. Luego realiza una operación de cifrado en la contraseña recuperada del usuario en la dirección 0x000538E0 y realiza un strcmp en la dirección 0x00053908 para comprobar si la contraseña es correcta o incorrecta. Sin embargo, el archivo /etc/shadow es una parte del sistema de archivos CRAM-FS, lo que quiere decir que el usuario no puede cambiar la contraseña y, por lo tanto, se utiliza un hash codificado en /etc/shadow para que coincida con las credenciales suministradas por el usuario. Este es un hash con sal de la cadena \"admin\" y, por lo tanto, actúa como una contraseña para el dispositivo que no se puede cambiar debido a que todo el sistema de archivos es de solo lectura."
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  "lastModified": "2026-06-17T01:26:21.133",
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