#?????????????????????硢????????????????????????????á?SSH???á??????????м??
  Checking the network...
  Performing checks on the network ports
  Checking for backdoor ports                         [ None found ]
  Performing checks on the network interfaces
  Checking for promiscuous interfaces                      [ None found ]
  Checking the local host...
  Performing system boot checks
  Checking for local host name                         [ Found ]
  Checking for system startup files                        [ Found ]
  Checking system startup files for malware                [ None found ]
  Performing group and account checks
  Checking for passwd file [ Found ]
  Checking for root equivalent (UID 0) accounts            [ None found ]
  Checking for passwordless accounts                   [ None found ]
  ....(??)....
  [Press <ENTER> to continue]
  #????????巋???????????ó???汾???м??
  Checking application versions...
  Checking version of GnuPG[ OK ]
  Checking version of OpenSSL                        [ Warning ]
  Checking version of OpenSSH                        [ OK ]
  #?????????????????????????????????????????????????????????????????????????
  System checks summary
  =====================
  File properties checks...
  Required commands check failed
  Files checked: 137
  Suspect files: 4
  Rootkit checks...
  Rootkits checked : 311
  Possible rootkits: 0
  Applications checks...
  Applications checked: 3
  Suspect applications: 1
  The system checks took: 6 minutes and 41 seconds

??????Linux??????rkhunter?????????????????????????в?????????????????????????????????????????????????????????????????м???????У?????????????????????Enter???????????????ó?????????У????????????????
????[root@server ~]# /usr/local/bin/rkhunter –check –skip-keypress
??????????????ü????????????У??????????/etc/crontab?м????????????
????30 09 * * * root /usr/local/bin/rkhunter –check –cronjob
??????????rkhunter?????????????9:30????????Ρ?
??????????￡?
??????????Bash????????SSH bash?????????????????
??????????????????????????????
????$ env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
????vulnerable
????this is a test
??????????????????????????????????????????????????
???????????????
????yum -y update bash
????????bash????в????
????$ env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
????bash: warning: x: ignoring function definition attempt
????bash: error importing function definition for `x'
????this is a test
???????????????????????????????