有人能解释这个报告吗？

这是我最近设置的rkhunter输出，所以我每天早上都会得到这个报告，可能somone请解释一下，如果我有一个严重的问题在这里（我知道httpd，openssl，PHP和sshd不是最新的，但所有其他命令，我不知道不明白 – 我是否有违规行为，有人用他们自己的文件replace了他们的文件 – 例如“/ usr / bin / whatis”）

Warning: Checking for prerequisites [ Warning ] The file of stored file properties (rkhunter.dat) does not exist, and should be created. To do this type in 'rkhunter --propupd'. Warning: WARNING! It is the users responsibility to ensure that when the '--propupd' option is used, all the files on their system are known to be genuine, and installed from a reliable source. The rkhunter '--check' option will compare the current file properties against previously stored values, and report if any values differ. However, rkhunter cannot determine what has caused the change, that is for the user to do. Warning: The command '/usr/bin/GET' has been replaced by a script: /usr/bin/GET: perl script text executable Warning: The command '/usr/bin/groups' has been replaced by a script: /usr/bin/groups: Bourne shell script text executable Warning: The command '/usr/bin/ldd' has been replaced by a script: /usr/bin/ldd: Bourne shell script text executable Warning: The command '/usr/bin/whatis' has been replaced by a script: /usr/bin/whatis: Bourne shell script text executable Warning: The command '/sbin/ifdown' has been replaced by a script: /sbin/ifdown: Bourne-Again shell script text executable Warning: The command '/sbin/ifup' has been replaced by a script: /sbin/ifup: Bourne-Again shell script text executable Warning: Found enabled xinetd service: /etc/xinetd.d/ftp_psa Warning: Found enabled xinetd service: /etc/xinetd.d/poppassd_psa Warning: No output found from the lsmod command or the /proc/modules file: /proc/modules output: lsmod output: Warning: The kernel modules directory '/lib/modules' is missing or empty. Warning: User 'hengifts-new' has been removed from the passwd file. Warning: Hidden directory found: /dev/.udev Warning: Hidden file found: /usr/share/man/man1/..1.gz: gzip compressed data, from Unix, max compression Warning: Hidden file found: /usr/bin/.ssh.hmac: ASCII text Warning: Hidden file found: /usr/bin/.fipscheck.hmac: ASCII text Warning: Hidden file found: /usr/sbin/.sshd.hmac: ASCII text Warning: Application 'httpd', version '2.2.3', is out of date, and possibly a security risk. Warning: Application 'openssl', version '0.9.8e', is out of date, and possibly a security risk. Warning: Application 'php', version '5.2.10', is out of date, and possibly a security risk. Warning: Application 'sshd', version '4.3p2', is out of date, and possibly a security risk.