rkhunter -c 로 점검시 의문사항

rkhunter -c  점검시 아래와 같이 경고가 나오는데요..

아래 서버는 centos5.1 설치한후 점검한것입니다.

물론 외부와는 네트워크 차단되있구요..

그런데도 아래와 같이 경고가 나오는것은 무엇일까요?

Checking system commands...

  Performing 'strings' command checks
    Checking 'strings' command                               [ OK ]

  Performing 'shared libraries' checks
    Checking for preloading variables                        [ None found ]
    Checking for preload file                                [ Not found ]
    Checking LD_LIBRARY_PATH variable                        [ Not found ]

  Performing file properties checks
    Checking for prerequisites                               [ Warning ]
    /bin/awk                                                 [ OK ]
    /bin/basename                                            [ OK ]
    /bin/bash                                                [ OK ]
    /bin/cat                                                 [ OK ]
    /bin/chmod                                               [ OK ]
    /bin/chown                                               [ OK ]
    /bin/cp                                                  [ OK ]
    /bin/csh                                                 [ OK ]
    /bin/cut                                                 [ OK ]
    /bin/date                                                [ OK ]
    /bin/df                                                  [ OK ]
    /bin/dmesg                                               [ OK ]
    /bin/echo                                                [ OK ]
    /bin/ed                                                  [ OK ]
    /bin/egrep                                               [ OK ]
    /bin/env                                                 [ OK ]
    /bin/fgrep                                               [ OK ]
    /bin/grep                                                [ OK ]
    /bin/kill                                                [ OK ]
    /bin/login                                               [ OK ]
    /bin/ls                                                  [ OK ]
    /bin/mail                                                [ OK ]
    /bin/mktemp                                              [ OK ]
    /bin/more                                                [ OK ]
    /bin/mount                                               [ OK ]
    /bin/mv                                                  [ OK ]
    /bin/netstat                                             [ OK ]
    /bin/ps                                                  [ OK ]
    /bin/pwd                                                 [ OK ]
    /bin/rpm                                                 [ OK ]
    /bin/sed                                                 [ OK ]
    /bin/sh                                                  [ OK ]
    /bin/sort                                                [ OK ]
    /bin/su                                                  [ OK ]
    /bin/touch                                               [ OK ]
    /bin/uname                                               [ OK ]
    /bin/gawk                                                [ OK ]
    /bin/tcsh                                                [ OK ]
    /usr/bin/awk                                             [ OK ]
    /usr/bin/chattr                                          [ OK ]
    /usr/bin/curl                                            [ OK ]
    /usr/bin/cut                                             [ OK ]
    /usr/bin/diff                                            [ OK ]
    /usr/bin/dirname                                         [ OK ]
    /usr/bin/du                                              [ OK ]
    /usr/bin/elinks                                          [ OK ]
    /usr/bin/env                                             [ OK ]
    /usr/bin/file                                            [ OK ]
    /usr/bin/find                                            [ OK ]
    /usr/bin/GET                                             [ Warning ]
    /usr/bin/groups                                          [ Warning ]
    /usr/bin/head                                            [ OK ]
    /usr/bin/id                                              [ OK ]
    /usr/bin/kill                                            [ OK ]
    /usr/bin/killall                                         [ OK ]
    /usr/bin/last                                            [ OK ]
    /usr/bin/lastlog                                         [ OK ]
    /usr/bin/ldd                                             [ Warning ]
    /usr/bin/less                                            [ OK ]
    /usr/bin/links                                           [ OK ]
    /usr/bin/locate                                          [ OK ]
    /usr/bin/logger                                          [ OK ]
    /usr/bin/lsattr                                          [ OK ]
    /usr/bin/md5sum                                          [ OK ]
    /usr/bin/newgrp                                          [ OK ]
    /usr/bin/passwd                                          [ OK ]
    /usr/bin/perl                                            [ OK ]
    /usr/bin/pstree                                          [ OK ]
    /usr/bin/readlink                                        [ OK ]
    /usr/bin/runcon                                          [ OK ]
    /usr/bin/sha1sum                                         [ OK ]
    /usr/bin/size                                            [ OK ]
    /usr/bin/stat                                            [ OK ]
    /usr/bin/strace                                          [ OK ]
    /usr/bin/strings                                         [ OK ]
    /usr/bin/sudo                                            [ OK ]
    /usr/bin/tail                                            [ OK ]
    /usr/bin/test                                            [ OK ]
    /usr/bin/top                                             [ OK ]
    /usr/bin/tr                                              [ OK ]
    /usr/bin/uniq                                            [ OK ]
    /usr/bin/users                                           [ OK ]
    /usr/bin/vmstat                                          [ OK ]
    /usr/bin/w                                               [ OK ]
    /usr/bin/watch                                           [ OK ]
    /usr/bin/wc                                              [ OK ]
    /usr/bin/wget                                            [ OK ]
    /usr/bin/whatis                                          [ Warning ]
    /usr/bin/whereis                                         [ OK ]
    /usr/bin/which                                           [ OK ]
    /usr/bin/who                                             [ OK ]
    /usr/bin/whoami                                          [ OK ]
    /usr/bin/gawk                                            [ OK ]
    /sbin/chkconfig                                          [ OK ]
    /sbin/depmod                                             [ OK ]
    /sbin/fuser                                              [ OK ]
    /sbin/ifconfig                                           [ OK ]
    /sbin/ifdown                                             [ Warning ]
    /sbin/ifup                                               [ Warning ]
    /sbin/init                                               [ OK ]
    /sbin/insmod                                             [ OK ]
    /sbin/ip                                                 [ OK ]
    /sbin/kudzu                                              [ OK ]
    /sbin/lsmod                                              [ OK ]
    /sbin/modinfo                                            [ OK ]
    /sbin/modprobe                                           [ OK ]
    /sbin/nologin                                            [ OK ]
    /sbin/rmmod                                              [ OK ]
    /sbin/runlevel                                           [ OK ]
    /sbin/sulogin                                            [ OK ]
    /sbin/sysctl                                             [ OK ]
    /sbin/syslogd                                            [ OK ]
    /usr/sbin/adduser                                        [ OK ]
    /usr/sbin/chroot                                         [ OK ]
    /usr/sbin/groupadd                                       [ OK ]
    /usr/sbin/groupdel                                       [ OK ]
    /usr/sbin/groupmod                                       [ OK ]
    /usr/sbin/grpck                                          [ OK ]
    /usr/sbin/kudzu                                          [ OK ]
    /usr/sbin/lsof                                           [ OK ]
    /usr/sbin/prelink                                        [ OK ]
    /usr/sbin/pwck                                           [ OK ]
    /usr/sbin/sestatus                                       [ OK ]
    /usr/sbin/tcpd                                           [ OK ]
    /usr/sbin/useradd                                        [ OK ]
    /usr/sbin/userdel                                        [ OK ]
    /usr/sbin/usermod                                        [ OK ]
    /usr/sbin/vipw                                           [ OK ]
    /usr/local/bin/curl                                      [ OK ]
    /usr/local/bin/rkhunter                                  [ OK ]

[Press <ENTER> to continue]