CVE-2019-5021

critical

Description

Versions of the Official Alpine Linux Docker images (since v3.3) contain a NULL password for the `root` user. This vulnerability appears to be the result of a regression introduced in December of 2015. Due to the nature of this issue, systems deployed using affected versions of the Alpine Linux container which utilize Linux PAM, or some other mechanism which uses the system shadow file as an authentication database, may accept a NULL password for the `root` user.

From the Tenable Blog

CVE-2019-5021: Hard-Coded NULL root Password Found in Alpine Linux Docker Images

Published: 2019-05-09

A Hard-Coded NULL root user password vulnerability was found in Alpine Linux Docker Images from December 2015’s 3.3 version onward. Users are encouraged to disable the root user, or any services that utilize the system shadow file as an authentication database.