Hello,
this hole was discovered on 29/02/04 and published in french here :
http://www.phpsecure.info/v2/tutos/frog/YaBBSE-XSSPermanent.txt
We were waiting an official security fix by the YabbSE team (since 1 month)
to published the hole on some mailing-lists but they always didn't make
anything.
Another security hole is :

[glow=red,2);background:url(javascript:[SCRIPT],300]text[/glow]

The new YabbSE-Team's project (SMF 1.0b http://www.simplemachines.org )
seems to be bugged too.

To fix these holes, you just have to replaced the lines :

------------------------------------------------------------------------
--
'/\[glow=(.+?),(.+?),(.+?)\](.+?)\[\/glow\]/eis',
'/\[shadow=(.+?),(.+?)\](.+?)\[\/shadow\]/eis',
------------------------------------------------------------------------
--

by :

------------------------------------------------------------------------
-----------
'/\[glow=([[:alpha:]]+?),(.+?),(.+?)\](.+?)\[\/glow\]/eis',
'/\[shadow=([[:alpha:]]+?),(.+?)\](.+?)\[\/shadow\]/eis',
------------------------------------------------------------------------
-----------

and the line :

------------------------------------------------------------------------
-----------------------------------------------------
"'<table style=\"border 0px;\"><tr><td style=\"filter:Glow(color=\\1,
strength=' . ('\\2' < 255 ? '\\2' : '255') . ');\">' . \"\\4\" .
'</td></tr></table>'",
------------------------------------------------------------------------
-----------------------------------------------------

by :

------------------------------------------------------------------------
-----------------------------------------------------
"'<table style=\"border 0px;\"><tr><td style=\"filter:Glow(color=\\1,
strength=' . intval( ('\\2' < 255 ? '\\2' : '255') ) . ');\">' . \"\\4\" .
'</td></tr></table>'",
------------------------------------------------------------------------
-----------------------------------------------------

in the file Sources/Subs.php.

A fix can be found on http://www.phpsecure.info

Sorry for my poor english,
Germain Randaxhe aka frog-m@n

http://www.phpsecure.info
http://www.security-corporation.com

>From: Cheng Peng Su <apple_soup (at) msn (dot) com [email concealed]>
>To: bugtraq (at) securityfocus (dot) com [email concealed]
>Subject: YaBB/YaBBse Cross Site Scripting Vulnerability
>Date: 14 Mar 2004 07:52:07 -0000
>
>
>
>
>#####################################################################
>
> Advisory Name : YaBB/YaBBse Cross Site Scripting Vulnerability
> Release Date : Mar 14,2004
> Application : YaBB/YaBBse
> Test On : YaBB 1 Gold(SP1.3)
> YaBB SE 1.5.1 Final
> Vendor URL : http://www.yabbforum.com/
> http://www.yabbse.org/
> Discover : Cheng Peng Su(apple_soup_at_msn.com)
>
>#####################################################################
>
> Proof of conecpt:
> The problem is in [glow] and [shadow] tag,yabb doesn't filter
> the charactor in this tag,attack needn't visitor to click any
> links,just when the vistor read the thread,XSS code will be
> executed.
>
> Exploit:
> [glow=red);background:url(javascript:alert(document.cookie));filte
> r:glow(color=red,2,300]Big Exploit[/glow]
> [shadow=red);background:url(javascript:alert(document.cookie));fil
> ter:shadow(color=red,left,300]Big Exploit[/shadow]
>
> Contact:
> Cheng Peng Su
> Class 1,Senior 2,High school attached to Wuhan University
> Wuhan,Hubei,China(430072)
> apple_soup_at_msn.com
>
>
>
>

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