CVE-2019-5021

[tao12345666333]

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.

ref: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5021

[tianon]

There's some relevant discussion over in gliderlabs/docker-alpine#511 and docker-library/official-images#5880

TLDR; no currently supported Alpine images are affected (all affected images are EOL), the attack vector is very narrow to begin with, and there are a couple other images we're looking to fix (and updating our test to catch this more aggressively).

[yosifkit]

https://alpinelinux.org/posts/Docker-image-vulnerability-CVE-2019-5021.html

[ncopa]

The issue was fixed March 7 2019 with docker-library/official-images#5516