Persistent cross site scripting and file upload attacks possible in course management about atutor HOT 2 CLOSED

1. Create course:
   The course name is not validated that allows to inject a javascript query into the name field.
   Steps to reproduce:

Instructor A creates a course with a script in course name as follows: <script>alert('CourseAlert');</script>

SOLUTION: add strip_tags() to sanitize course title

Another script in banner. <script>alert('BannerAlert');</script>

SOLUTION: won't fix. banner should allow JS.
Login as admin.
When you click on courses, the ‘CourseAlert’ pops up.
Every time the course profile is checked by the student, the ‘BannerAlert’ also pops up. Severity is high as admin could be attacked with a malicious script.

2. File Upload in course
   There are illegal file extensions mentioned where all the executable files are checked. But a file without any extension is accepted. This could be a binary executable file.
   SOLUTION: added extention required

Filename - It is possible to mount a javascript into this variable. Filename is not validated.
File content - An attacker can write a malicious script into the file content and upload.

Steps to reproduce:

Instructor A goes to his course and then go to file storage.
Clicks on create a new file.
The file name is given as : <script>alert('File1');</script>

SOLUTION: required file extension fixes this
The file content is given as <script>alert('Filecontent');</script>
SOLUTION: won't fix this. script should be allowed in file content
Now a student/Admin logs in. As soon as a page displaying file name comes, the script File1 gets popped up even without clicking on it.
If the content is downloaded, the alert Filecontent pops up.

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tracker URL
http://www.atutor.ca/atutor/mantis/view.php?id=5608

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