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Header

Product - Banner Student System by SunGard
Specific Page - http://www.EXAMPLE.com/PATH/twbkwbis.P_SecurityQuestion (Change Security Question)
Version - 7.4 / earlier versions could be effected also
Product URL - http://www.sungardhe.com/Products/Product.aspx?id=1024
Bug Type - Cross Site Scripting (XSS)
Discovery Date - 04/06/2009
Notification Date - 04/06/2009

Contact

Author - gmar
Website - yougotxssed.com

Bug in a nut shell

Students that use this system could inject malicious code into the "New Question: " field (NAME="question"). When saving
the changes, the system does not strip out HTML entities.

Bug scenario

Jim does not like his teacher / administrator at his school. He changes his forgotten pin security question. He puts in a
specially crafted piece of code in the field to call a remote javascript file. He emails his teacher administrator and
tells them he has forgotten his password and wonders if they could walk him through out to retrieve it. He tells them that
he can not get it to work and asks them if the could try to retrieve his password. They enter in his username and hit the
"forget password?" button. The next screen comes up and the script is launched. Jim could steal the session of the teacher
/ administrator, he could fake a login page and wait for his teacher /administrator to authenticate, or he could just do
malicious things to their browser.

Bug PoC

Enter ANY html into the "New Question" field and hit submit.
Logout and then go to the login screen again.
Enter in your username and hit forget password.

Fix

Sanitize the user input in all fields to make sure there is no unwanted characters ( html entities ). You could encode
them on POST.