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Blackboard Academic Suite 6.2.23 +/-: Persistent cross-site scripting vulnerability
From: <harbl () hushmail com>
Date: Thu, 20 Jul 2006 14:44:00 -0400
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I. Affected Software
Blackboard Academic Suite 188.8.131.52
Prior or newer versions may also be affected.
Vendor website: http://www.blackboard.com/
Objective: Privilege escalation
There is a persistent/stored/second-order cross-site scripting
vulnerability within the testing functionality of Blackboard
Academic Suite 6.2.23. The vulnerability can be used by attackers
who have unprivileged user accounts to escalate their privileges
within one or more Blackboard courses, or, with luck, gain system-
wide Blackboard administrative privileges. Privilege escalation is
possible by using the vulnerability to steal "session_id" cookies
from users whose accounts have higher privileges than the
attacker's account. An additional attack opportunity may exist if
an attacker has identified a remotely-exploitable vulnerability in
Blackboard Academic Suite 6.2.23 attempts to defend against this
to validate input is a bad idea. In this case, the attacker can
his/her web browser.
To exploit the vulnerability when using Mozilla Firefox to access a
Blackboard Academic Suite 184.108.40.206 system:
1. As a user with the course instructor role, create a test in any
course and add an essay question to the test. Deploy the test in a
course area that is available to students in the course.
2. Login to the course as a user who has the student role in the
course selected for step 1. Access the course; you should now see
the course's entry point page.
4. Navigate to and click the link for the test created in step 1.
Begin the test.
5. The essay question created in step 1 should appear. Click the
"HTML" radio button below the question's response box. Enter
8. Login as the course instructor.
9. Access the course selected in step one. In the course's control
panel, click "Gradebook", then click the name of the test created
in step one, and then click "View Attempt Details".
the target’s browser in the security context of the Blackboard
website being accessed.
There is no known solution at this time.
The vendor has been aware of this vulnerability for at least two
and one-half months.
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- Blackboard Academic Suite 6.2.23 +/-: Persistent cross-site scripting vulnerability harbl (Jul 22)