Insecure Access Control via /sbin/nologin Shell in Fedora and Red Hat Enterprise Linux

CVE-2018-1113 · MEDIUM Severity

AV:L/AC:L/AU:N/C:P/I:P/A:P

setup before version 2.11.4-1.fc28 in Fedora and Red Hat Enterprise Linux added /sbin/nologin and /usr/sbin/nologin to /etc/shells. This violates security assumptions made by pam_shells and some daemons which allow access based on a user's shell being listed in /etc/shells. Under some circumstances, users which had their shell changed to /sbin/nologin could still access the system.

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