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Vulnerabilidades / CVE-2020-27780

crítica

CVE-2020-27780

pam: authentication bypass when the user doesn't exist and root password is blank

Publicada Modificada CWE 287
En la Trivy database desde, como mínimo, el 24 oct 2026, 07:11 UTCNo consta cuándo entró antes de ese build.

Severidad por fuente

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

La etiqueta propia de Trivy es CRITICAL. Crítica según NVD, CBL-Mariner. Más baja según Red Hat (media).

Descripción

A flaw was found in Linux-Pam in versions prior to 1.5.1 in the way it handle empty passwords for non-existing users. When the user doesn't exist PAM try to authenticate with root and in the case of an empty password it successfully authenticate.

Paquetes afectados y versiones corregidas

FuentePaqueteCorregido en
CBL-Mariner 1.0pam0:1.5.1-2.cm1
alpine 3.13linux-pam1.5.1
alpine 3.14linux-pam1.5.1-r0
alpine 3.15linux-pam1.5.1-r0
alpine 3.16linux-pam1.5.1-r0
alpine 3.17linux-pam1.5.1-r0
alpine 3.18linux-pam1.5.1-r0
alpine 3.19linux-pam1.5.1-r0
alpine 3.20linux-pam1.5.1-r0
alpine 3.21linux-pam1.5.1-r0
alpine 3.22linux-pam1.5.1-r0
alpine 3.23linux-pam1.5.1-r0
Mostrar las 16 entradas de 16 fuentes
FuentePaqueteCorregido en
CBL-Mariner 1.0pam0:1.5.1-2.cm1
alpine 3.13linux-pam1.5.1
alpine 3.14linux-pam1.5.1-r0
alpine 3.15linux-pam1.5.1-r0
alpine 3.16linux-pam1.5.1-r0
alpine 3.17linux-pam1.5.1-r0
alpine 3.18linux-pam1.5.1-r0
alpine 3.19linux-pam1.5.1-r0
alpine 3.20linux-pam1.5.1-r0
alpine 3.21linux-pam1.5.1-r0
alpine 3.22linux-pam1.5.1-r0
alpine 3.23linux-pam1.5.1-r0
alpine 3.24linux-pam1.5.1-r0
alpine edgelinux-pam1.5.1-r0
root.io alpine 3.18rootio-linux-pam1.5.1-r0
root.io alpine 3.19rootio-linux-pam1.5.1-r0

Referencias

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.