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標題: [分享] 這兩天被暴力掃描SSH致系統服務掛掉的解決辦法 [打印本頁]
作者: dre5m    時間: 2013-9-12 14:59     標題: 這兩天被暴力掃描SSH致系統服務掛掉的解決辦法

本帖最后由 dre5m 于 2013-9-12 15:07 編輯

@yishunguang @jiahuajie @w17630
這兩天被惡意掃描SSH，導致磁盤IO負荷猛增，最終影響系統服務，比如httpd nginxd mysqld wdapached sshed這些服務宕掉，讓網站無法正常運行。（起初似乎是在掃mysql？ 但今天發(fā)現是在暴力掃SSH）

部分系統安全日志：

  1. Sep 11 17:00:56 MyServer sshd[27664]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  2. Sep 11 17:00:58 MyServer sshd[27664]: Failed password for root from 222.36.0.44 port 40348 ssh2
  3. Sep 11 17:00:58 MyServer sshd[27665]: Received disconnect from 222.36.0.44: 11: Bye Bye
  4. Sep 11 17:00:59 MyServer sshd[27666]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  5. Sep 11 17:01:01 MyServer sshd[27666]: Failed password for root from 222.36.0.44 port 43997 ssh2
  6. Sep 11 17:01:01 MyServer sshd[27667]: Received disconnect from 222.36.0.44: 11: Bye Bye
  7. Sep 11 17:01:02 MyServer sshd[27669]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  8. Sep 11 17:01:03 MyServer sshd[27669]: Failed password for root from 222.36.0.44 port 47379 ssh2
  9. Sep 11 17:01:03 MyServer sshd[27680]: Received disconnect from 222.36.0.44: 11: Bye Bye
  10. Sep 11 17:01:04 MyServer sshd[27681]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  11. Sep 11 17:01:06 MyServer sshd[27681]: Failed password for root from 222.36.0.44 port 50415 ssh2
  12. Sep 11 17:01:06 MyServer sshd[27682]: Received disconnect from 222.36.0.44: 11: Bye Bye
  13. Sep 11 17:01:07 MyServer sshd[27683]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  14. Sep 11 17:01:10 MyServer sshd[27683]: Failed password for root from 222.36.0.44 port 53824 ssh2
  15. Sep 11 17:01:10 MyServer sshd[27684]: Received disconnect from 222.36.0.44: 11: Bye Bye
  16. Sep 11 17:01:11 MyServer sshd[27685]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  17. Sep 11 17:01:13 MyServer sshd[27685]: Failed password for root from 222.36.0.44 port 58087 ssh2
  18. Sep 11 17:01:13 MyServer sshd[27686]: Received disconnect from 222.36.0.44: 11: Bye Bye
  19. Sep 11 17:01:14 MyServer sshd[27687]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  20. Sep 11 17:01:16 MyServer sshd[27687]: Failed password for root from 222.36.0.44 port 33608 ssh2
  21. Sep 11 17:01:16 MyServer sshd[27688]: Received disconnect from 222.36.0.44: 11: Bye Bye
  22. Sep 11 17:01:17 MyServer sshd[27689]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  23. Sep 11 17:01:19 MyServer sshd[27689]: Failed password for root from 222.36.0.44 port 37081 ssh2
  24. Sep 11 17:01:19 MyServer sshd[27690]: Received disconnect from 222.36.0.44: 11: Bye Bye
  25. Sep 11 17:01:20 MyServer sshd[27691]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.36.0.44  user=root
  26. Sep 11 17:01:21 MyServer sshd[27691]: Failed password for root from 222.36.0.44 port 40586 ssh2
復制代碼



磁盤IO

IO.jpg


解決辦法是安裝一個自動屏蔽軟件denyhosts，并設為隨VPS啟動，我參考的是 http://itzzz.com/server/065248.html ，寫的很詳細，就不贅述了

denyhosts的日志，看這幾個哪個軟件掃來掃去的賤人在搞神馬啊。。：

  1. 2013-09-12 14:13:03,125 - denyhosts   : INFO     Processing log file (/var/log/secure) from offset (0)
  2. 2013-09-12 14:13:35,902 - denyhosts   : INFO     new denied hosts: ['103.31.80.46', '218.95.37.206', '211.139.127.228', '195.88.62.132', '61.164.110.115', '88.208.222.32', '60.165.167.2', '76.74.201.147', '123.103.12.34', '212.227.89.88', '137.175.46.104', '190.11.160.179', '60.173.11.253', '82.165.133.118', '222.36.0.44', '117.141.96.7', '210.21.90.38', '221.176.53.109', '61.164.118.195', '182.18.31.165', '123.103.12.35']
  3. 2013-09-12 14:13:35,903 - denyhosts   : INFO     launching DenyHosts daemon (version 2.6)..
復制代碼

被攻擊以后可能你的服務都被關掉了，start一下即可
service httpd start
service mysqld start
service nginxd start
service wdapache start

圖片附件: IO.jpg (2013-9-12 14:55, 23.71 KB) / 下載次數 8382
http://www.szkyjg.com/bbs/attachment.php?aid=3609&k=455640da841e3d37ac4826a000c6a837&t=1746274649&sid=jhhe74

作者: admin    時間: 2013-9-13 16:09

最簡單的辦法,修改下SSH的端口,而不是用默認的22
作者: w263756314    時間: 2014-2-6 22:55

http://centoshelp.org/security/denyhosts/
有更簡單的安裝辦法



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