CVE-2026-23741

Estado: AnalizadaAlta (8.8)—

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, the asterisk/contrib/scripts/ast_coredumper runs as root, as noted by the NOTES tag on line 689 of the ast_coredumper file. The script will source the contents of /etc/asterisk/ast_debug_tools.conf, which resides in a folder that is writeable by the asterisk user:group.

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Due to the /etc/asterisk/ast_debug_tools.conf file following bash semantics and it being loaded; an attacker with write permissions may add or modify the file such that when the root ast_coredumper is run; it would source and thereby execute arbitrary bash code found in the /etc/asterisk/ast_debug_tools.conf. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.21%
Percentil entre todas las CVEs puntuadas: 10
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.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement60 %
Impacto principalT1574.007 Path Interception by PATH Environment Variablestealth · execution55 %

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability Scanning Threat Intelligence Program Restrict File and Directory Permissions Privileged Account Management Network Segmentation Execution Prevention

Tecnologías afectadas (2)

Sangoma — Asterisk Sangoma — Certified Asterisk

CWE

CWE-427

Referencias

https://github.com/asterisk/asterisk/security/advisories/GHSA-rvch-3jmx-3jf3

JSON original (NVD)

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      "value": "Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, the asterisk/contrib/scripts/ast_coredumper runs as root, as noted by the NOTES tag on line 689 of the ast_coredumper file. The script will source the contents of /etc/asterisk/ast_debug_tools.conf, which resides in a folder that is writeable by the asterisk user:group. Due to the /etc/asterisk/ast_debug_tools.conf file following bash semantics and it being loaded; an attacker with write permissions may add or modify the file such that when the root ast_coredumper is run; it would source and thereby execute arbitrary bash code found in the /etc/asterisk/ast_debug_tools.conf. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2."
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      "value": "Asterisk es un kit de herramientas de telefonía y centralita privada de código abierto. Antes de las versiones 20.7-cert9, 20.18.2, 21.12.1, 22.8.2 y 23.2.2, el script asterisk/contrib/scripts/ast_coredumper se ejecuta como root, como se indica en la etiqueta NOTES en la línea 689 del archivo ast_coredumper. El script obtendrá el contenido de /etc/asterisk/ast_debug_tools.conf, que reside en una carpeta que es escribible por el usuario:grupo asterisk. Debido a que el archivo /etc/asterisk/ast_debug_tools.conf sigue la semántica de bash y a que se carga; un atacante con permisos de escritura puede añadir o modificar el archivo de tal manera que cuando se ejecute el ast_coredumper de root; este obtendría y, por lo tanto, ejecutaría código bash arbitrario encontrado en el /etc/asterisk/ast_debug_tools.conf. Este problema ha sido parcheado en las versiones 20.7-cert9, 20.18.2, 21.12.1, 22.8.2 y 23.2.2."
    }
  ],
  "lastModified": "2026-06-17T10:22:01.827",
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