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.
Impacto
Puntuación base 3.x
3.30
Gravedad 3.x
BAJA
Productos y versiones vulnerables
| CPE | Desde | Hasta |
|---|---|---|
| cpe:2.3:a:shadow_project:shadow:4.13:*:*:*:*:*:*:* |
Para consultar la lista completa de nombres de CPE con productos y versiones, ver esta página
Referencias a soluciones, herramientas e información
- https://github.com/shadow-maint/shadow/commit/e5905c4b84d4fb90aefcd96ee618411ebfac663d
- https://github.com/shadow-maint/shadow/pull/687
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2023-29383-abusing-linux-chfn-to-misrepresent-etc-passwd/
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=31797
- https://github.com/shadow-maint/shadow/commit/e5905c4b84d4fb90aefcd96ee618411ebfac663d
- https://github.com/shadow-maint/shadow/pull/687
- https://lists.debian.org/debian-lts-announce/2025/04/msg00026.html
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2023-29383-abusing-linux-chfn-to-misrepresent-etc-passwd/
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=31797



