晚下服务器被攻击的，请高手给看看小弟我的文件，什么有关问题

晚上服务器被攻击的，请高手给看看我的文件，什么问题
今天晚上，我的服务器被黑了，屏幕如下图示，后面是我被修改的主页文件，请高手给看看，他怎么进来的，我的漏洞是什么？


index.php

<script><br /> <!--//<br /> function tb9_makeArray(n){<br /> this.length = n;<br /> return this.length;<br /> }<br /> tb9_messages = new tb9_makeArray(4);<br /> tb9_messages[0] = "#Hacked By Ramzi Null";<br /> tb9_messages[1] = "#Tunisia Hackers";<br /> tb9_messages[2] = "..................";<br /> tb9_messages[3] = "|";<br /> tb9_messages[4] = "<========== | ==========>";<br /> tb9_messages[5] = " <===== | =====> ";<br /> tb9_rptType = 'infinite';<br /> tb9_rptNbr = 5;<br /> tb9_speed = 75;<br /> tb9_delay = 2000;<br /> var tb9_counter=1;<br /> var tb9_currMsg=0;<br /> var tb9_timerID = null<br /> var tb9_bannerRunning = false<br /> var tb9_state = ""<br /> tb9_clearState()<br /> function tb9_stopBanner() { <br /> if (tb9_bannerRunning) <br /> clearTimeout(tb9_timerID) <br /> tb9_timerRunning = false<br /> }<br /> function tb9_startBanner() { <br /> tb9_stopBanner() <br /> tb9_showBanner()<br /> }<br /> function tb9_clearState() { <br /> tb9_state = "" <br /> for (var i = 0; i < tb9_messages[tb9_currMsg].length; ++i) { <br /> tb9_state += "0" <br /> }<br /> }<br /> function tb9_showBanner() { <br /> if (tb9_getString()) { <br /> tb9_currMsg++ <br /> if (tb9_messages.length <= tb9_currMsg) { <br /> if ((tb9_rptType == 'finite') && (tb9_counter==tb9_rptNbr)){<br /> tb9_stopBanner();<br /> return;<br /> }<br /> tb9_counter++;<br /> tb9_currMsg=0;<br /> }<br /> tb9_clearState() <br /> tb9_timerID = setTimeout("tb9_showBanner()", tb9_delay) <br /> } <br /> else { <br /> var tb9_str = "" <br /> for (var j = 0; j < tb9_state.length; ++j) { <br /> tb9_str += (tb9_state.charAt(j) == "1") ? tb9_messages[tb9_currMsg].charAt(j) : "___" <br /> } <br /> document.title = tb9_str <br /> tb9_timerID = setTimeout("tb9_showBanner()", tb9_speed) <br /> }<br /> }<br /> function tb9_getString() { <br /> var full = true <br /> for (var j = 0; j < tb9_state.length; ++j) { <br /> if (tb9_state.charAt(j) == 0) <br /> full = false <br /> } <br /> if (full) return true <br /> while (1) { <br /> var num = tb9_getRandom(tb9_messages[tb9_currMsg].length) <br /> if (tb9_state.charAt(num) == "0") <br /> break<br /> } <br /> tb9_state = tb9_state.substring(0, num) + "1" + tb9_state.substring(num + 1, tb9_state.length) <br /> return false <div class="clear"> </script>