Mysteriously, on our public SSH server, root user is now showing up as qroot. All the files owned by root are now owned by qroot.
id qroot shows qroot is UID 0
/etc/passwd file is owned by qroot
/etc/shadow is readable only by qroot
su - says su: user root does not exist
su qroot says password is wrong (probably because shadow file mismatches)
What can I do to recover root user?
Fedora 14, plain /etc/passwd file based auth.