Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2023-29383

Gravedad CVSS v3.1:
BAJA
Tipo:
CWE-74 Neutralización incorrecta de elementos especiales en la salida utilizada por un componente interno (Inyección)
Fecha de publicación:
14/04/2023
Última modificación:
03/11/2025

Descripción

*** Pendiente de traducción *** In Shadow 4.13, it is possible to inject control characters into fields provided to the SUID program chfn (change finger). Although it is not possible to exploit this directly (e.g., adding a new user fails because \n is in the block list), it is possible to misrepresent the /etc/passwd file when viewed. Use of \r manipulations and Unicode characters to work around blocking of the : character make it possible to give the impression that a new user has been added. In other words, an adversary may be able to convince a system administrator to take the system offline (an indirect, social-engineered denial of service) by demonstrating that "cat /etc/passwd" shows a rogue user account.

Productos y versiones vulnerables

CPE Desde Hasta
cpe:2.3:a:shadow_project:shadow:4.13:*:*:*:*:*:*:*