CVE-2025-15604

Estado: ModificadaCrítica (9.8)—

Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions.

In versions 6.06 through 6.16, the random_string function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes by concatenating a SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.

Before version 6.06, there was no fallback when /dev/urandom was not available.

Leer descripción completaMostrar menos

Before version 6.04, the random_string function used the built-in rand() function to generate a mixed-case alphanumeric string.

This function may be used for generating session ids, generating secrets for signing or encrypting cookie session data and generating tokens used for Cross Site Request Forgery (CSRF) protection.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.52%
Percentil entre todas las CVEs puntuadas: 42
Fecha de la puntuación: 5/10/2026

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).

🎯 Técnicas ATT&CK

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

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %
Impacto principalT1212 Exploitation for Credential Accesscredential access85 %
Impacto secundarioT1078 Valid Accountsstealth · persistence · privilege escalation · initial access75 %
Impacto secundarioT1565.003 Runtime Data Manipulationimpact70 %

Vector CVSS N/N/N indica explotación remota sin privilegios (T1190). Generación de números aleatorios débil compromete sesiones y CSRF tokens, permitiendo robo de credenciales (T1212), asunción de identidades (T1078) y manipulación de datos de sesión (T1565.003).

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

Application Developer Guidance Privileged Account Management Network Segmentation Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Tokuhirom — Amon2

CWE

CWE-338, CWE-340

Referencias

JSON original (NVD)

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      "value": "Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions.\n\nIn versions 6.06 through 6.16, the random_string function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes by concatenating a SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time.  The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.\n\nBefore version 6.06, there was no fallback when /dev/urandom was not available.\n\nBefore version 6.04, the random_string function used the built-in rand() function to generate a mixed-case alphanumeric string.\n\nThis function may be used for generating session ids, generating secrets for signing or encrypting cookie session data and generating tokens used for Cross Site Request Forgery (CSRF) protection."
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      "value": "Las versiones de Amon2 anteriores a la 6.17 para Perl utilizan una implementación insegura de random_string para funciones de seguridad.\n\nEn las versiones 6.06 a la 6.16, la función random_string intentará leer bytes del dispositivo /dev/urandom, pero si este no está disponible, entonces genera bytes concatenando un hash SHA-1 inicializado con la función rand() incorporada, el PID y el tiempo de época de alta resolución. El PID provendrá de un pequeño conjunto de números, y el tiempo de época puede ser adivinado, si no se filtra del encabezado HTTP Date. La función rand incorporada no es adecuada para uso criptográfico.\n\nAntes de la versión 6.06, no había un mecanismo de respaldo cuando /dev/urandom no estaba disponible.\n\nAntes de la versión 6.04, la función random_string utilizaba la función rand() incorporada para generar una cadena alfanumérica de mayúsculas y minúsculas.\n\nEsta función puede ser utilizada para generar IDs de sesión, generar secretos para firmar o cifrar datos de sesión de cookie y generar tokens utilizados para la protección contra la falsificación de solicitudes entre sitios (CSRF)."
    }
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  "lastModified": "2026-06-17T08:38:06.137",
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