一些 PHP 管理系统程序中的后门

一些php网站管理程序的，一些后门，其实官方也没有恶意，主要是大家为了自己的安全。

我倒不怎么关心提示框,SABLOG怎么知道我的版本有漏洞呢,程序肯定有后门.每次登陆后台自动检测官方版本跟当前版本对比.嗯.后来找到了.在templates/admin/main.php最后的一部分.删掉如下代码就OK了.
其实这个不足以导致被黑的,现在一般有点常识的,密码都比较复杂,几个数字+几个字母,MD5的话一般很难跑出来.当然有彩虹表的话,另说...

<script type="text/javascript"> 

i=1; 

var autourl=new Array(); 

autourl[1] = 'www.sablog.net'; 

autourl[2] = 'cnc.sablog.net'; 

function auto(url){ 

if(i){ 

i=0; 

var oHead = document.getElementsByTagName('head').item(0); 

var oScript= document.createElement("script"); 

oScript.type = "text/javascript"; 

oScript.src = "http://"+url+"/update.php?version=$now_version&release=$now_release&hostname=$now_hostname"; 

oHead.appendChild(oScript); 

} 

} 

function run(){ 

for(var i=1;i<autourl.length;i++) { 

document.write("<img src=http://"+autourl+" width=1 height=1 onerror=auto('"+autourl+"')>"); 

} 

} 

run(); 

</script>

 

目前流行的程序里,不止SABLOG一个,Discuz,DEDECMS都是有这样的后门的.这样的后门官方的真正用意很难说.
为了让用户及时得到最新的补丁,最新的版本是一方面,其他的,随便人家怎么发挥了...
但是这个东西有好的一面,也有坏的一面,一旦官方被黑,后果可想而知,所有的用户就被"批量挂马"了.
现在干脆都给发出来吧.先来个DEDECMS的,标示出来的删掉就行:

/include/inc_functions.php 

function GetNewInfo(){ 

if(!isset($GLOBALS['__funAdmin'])) require_once(dirname(__FILE__)."/inc/inc_fun_funAdmin.php"); 

return SpGetNewInfo(); 

} 

/include/inc/inc_fun_funAdmin.php 

function SpGetNewInfo(){ 

global $cfg_version; 

$nurl = $_SERVER["HTTP_HOST"]; 

if( eregi("[a-z\-]{1,}\.[a-z]{2,}",$nurl) ){ $nurl = urlencode($nurl); } 

else{ $nurl = "test"; } 

$gs = "<iframe name='stafrm' src='http://www.dedecms.com/newinfo.php?version=".urlencode($cfg_version)."&formurl=$nurl' frameborder='0' id='stafrm' width='100%' height='50'></iframe>"; 

return $gs; 

} 

dede/index_body.php(其中dede为后台目录) 

<div class="bodytitle"> 

<div class="bodytitleleft"></div> 

<div class="bodytitletxt">DedeCms最新消息</div> 

</div> 

<table width="96%" border="0" align="center" cellpadding="0" cellspacing="0"> 

<tr><form name="uploadspider" action="upload_spider.php" method="post"> 

<td height="80" class="main_dnews"> 

<?php echo GetNewInfo()?> </td> 

</form> 

</tr> 

</table>

/include/inc/inc_stat.php

<?php

function SpUpdateStat()

{

    global $cfg_version;

    if(empty($cfg_version))

    {

        $cfg_version = 'notknow';

    }

    $statport = array(0x68,0x74,0x74,0x70,0x3a,0x2f,0x2f,0x77,0x77,0x77,0x2e,0x64,0x65,0x64,0x65,

        0x63,0x6d,0x73,0x2e,0x63,0x6f,0x6d,0x2f,0x73,0x74,0x61,0x74,0x2e,0x70,0x68,0x70,

        0x3f,0x72,0x66,0x68,0x6f,0x73,0x74,0x3d);

    $staturl = '';

    foreach($statport as $c)

    {

        $staturl .= chr($c);

    }

    $staturl = $staturl.urlencode($_SERVER['HTTP_HOST']).'&ver='.urlencode($cfg_version);

    //return $staturl;

    $stat = @file_get_contents($staturl);

    return $stat;

}

//echo "version: ".SpUpdateStat();

 

再把DZ的"后门"发出来吧.admin\global.func.php里面查找"function cpfooter",替换成如下的function:

function cpfooter() { 

global $version, $adminid, $db, $tablepre, $action, $bbname, $charset, $timestamp, $isfounder, $insenz; 

global $_COOKIE, $_SESSION, $_DCOOKIE, $_DCACHE, $_DSESSION, $_DCACHE, $_DPLUGIN, $sqldebug, $debuginfo; 

$infmessage = ''; 

?> 

<?=$infmessage?> 

<?php echo $sqldebug;?> 

</div> 

</body> 

</html> 

<?php 

updatesession(); 

}

 

这个文件中还有一个function,没必要的,可以去掉:

function bbsinformation() { 

global $db, $timestamp, $tablepre, $charset, $bbname, $_SERVER, $siteuniqueid, $save_mastermobile; 

$update = array('uniqueid' => $siteuniqueid, 'version' => DISCUZ_VERSION, 'release' => DISCUZ_RELEASE, 'php' => PHP_VERSION, 'mysql' => $db->version(), 'charset' => $charset, 'bbname' => $bbname, 'mastermobile' => $save_mastermobile); 

$updatetime = @filemtime(DISCUZ_ROOT.'./forumdata/updatetime.lock'); 

if(emptyempty($updatetime) || ($timestamp - $updatetime > 3600 * 4)) { 

@touch(DISCUZ_ROOT.'./forumdata/updatetime.lock'); 

$update['members'] = $db->result_first("SELECT COUNT(*) FROM {$tablepre}members"); 

$update['threads'] = $db->result_first("SELECT COUNT(*) FROM {$tablepre}threads"); 

$update['posts'] = $db->result_first("SELECT COUNT(*) FROM {$tablepre}posts"); 

$query = $db->query("SELECT special, count(*) AS spcount FROM {$tablepre}threads GROUP BY special"); 

while($thread = $db->fetch_array($query)) { 

$thread['special'] = intval($thread['special']); 

$update['spt_'.$thread['special']] = $thread['spcount']; 

} 

} 

$data = ''; 

foreach($update as $key => $value) { 

$data .= $key.'='.rawurlencode($value).'&'; 

} 

return 'update='.rawurlencode(base64_encode($data)).'&md5hash='.substr(md5($_SERVER['HTTP_USER_AGENT'].implode('', $update).$timestamp), 8, 8).'×tamp='.$timestamp; 

}

 

还有admin/home.inc.php,大概193~196行(DZ6.1.0 UTF-8官方原版),这里:

 

showtablerow('', array('class="vtop td24 lineheight"', 'class="lineheight smallfont"'), array( 

lang('home_discuz_version'), 

'Discuz! '.DISCUZ_VERSION.' Release '.DISCUZ_RELEASE.' <a href="http://www.discuz.net/forumdisplay.php?fid=10" class="lightlink smallfont" target="_blank">'.lang('home_check_newversion').'</a> ' 

));

 

虽然说这里没有直接与官方进行通信,但是,,,我看着不爽,想打补丁自己常去官方看就是了.还有所有文件名中包含insenz的文件,用不着的话就直接删除.没什么用.