Invision Power Board : XSS in [FONT] and [COLOR] tags.

2003-09-13T00:00:00
ID SECURITYVULNS:DOC:5105
Type securityvulns
Reporter Securityvulns
Modified 2003-09-13T00:00:00

Description

Informations : °°°°°°°°°°°°°° Language : PHP Version : 1.2 FINAL Website : http://www.invisionboard.com/ Problem : Permanent XSS

Dev : °°°°° [FONT=expression(alert(document.cookie))]text[/FONT] will made the HTML : <span style='font-family:expression(alert(document.cookie))'>text</span> [COLOR=expression(alert(document.cookie))]texte[/COLOR] will made the HTML : <span style='color:expression(alert(document.cookie))'>text</span>

and the javascript alert(document.cookie) will be executed.

Solution : °°°°°°°°° A patch can be found on http://www.phpsecure.info. In sources/lib/post_parser.php , just replace the lines :


while ( preg_match( "#\[font=([^\]]+)\](.?)\[/font\]#ies", $txt ) ) { $txt = preg_replace( "#\[font=([^\]]+)\](.?)\[/font\]#ies" , "\$this->regex_font_attr(array('s'=>'font','1'=>'\\1','2'=>'\\2'))", $txt ); }

while( preg_match( "#\[color=([^\]]+)\](.+?)\[/color\]#ies", $txt ) ) { $txt = preg_replace( "#\[color=([^\]]+)\](.+?)\[/color\]#ies" , "\$this->regex_font_attr(array('s'=>'col' ,'1'=>'\\1','2'=>'\\2'))", $txt ); }


by the lines :


while ( preg_match( "#\[font=([^;<>\\(\)\]\"'])\](.?)\[/font\]#ies", $txt ) ) { $txt = preg_replace( "#\[font=([^;<>\\(\)\"'])\](.?)\[/font\]#ies" , "\$this->regex_font_attr(array('s'=>'font','1'=>'\\1','2'=>'\\2'))", $txt ); }

while( preg_match( "#\[color=([a-zA-Z0-9])\](.+?)\[/color\]#ies", $txt ) ) { $txt = preg_replace( "#\[color=([a-zA-Z0-9])\](.+?)\[/color\]#ies" , "\$this->regex_font_attr(array('s'=>'col' ,'1'=>'\\1','2'=>'\\2'))", $txt ); }


More Details : °°°°°°°°°°°° in french : http://www.phpsecure.info/v2/tutos/InvisionPowerBoard1.2F.txt

frog-m@n (http://www.phpsecure.info)


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