CVE-2019-9787 PoC — WordPress 跨站请求伪造漏洞

Description

Try to reproduce this issue with Docker

介绍

# Wordpress_CVE-2019-9787
Try to reproduce this issue with Docker with an auto install for wordpress

PoC of CVE-2019-9787 CSRF
WordPress Version up to 5.1

To demonstrate the full potential of CVE-2019-9787 you probably want a more nasty piece of code than the comment present in nginx/iframe-post.html. In my code I don't use the flaw in the Wordpress wp_filter_post_kses().

Do not use this except for test purpose.


# Installation using bash :

copy the repo :
>git clone https://github.com/matinciel/Wordpress_CVE-2019-9787.git

go to the directory
>cd Wordpress_CVE-2019-9787

launch the install, you need **docker 18.02.0 at least** (docker -v to check)
>make autoinstall


# Now you have installed : 
Wordpress (with a default admin account log : wordpress / pass : wordpress).
You can access it with http://localhost
    
# if you want to reproduce the security issue :
    
## Hacker part
1. go to wordpress (do not connect as wordpress). http://localhost
2. Leave a comment on the Hello world! post (by clicking the "1 Comment link).
the comment should contain something like (only url is needed) :
>Please visit my blog : http://localhost:6060
    
## Wordpress owner (admin or editor role needed).
1. login in the wordpress "backend" by going to http://localhost/wp-admin
        log : wordpress
        password : wordpress
2. You should see a comment to validate in the comment section, just click on the link.
3. Go back to http://localhost/wp-admin : click on the comment tab, you should have a new comment already validted without any action from your side...
    
# Limitiation :
1. the malicious code in the iframe only works with the post ID=1 (Hello World!)
2. if a "hacked" comment is already validated, it does not work again
3. nonce protection seems not to be needed to make a comment validation (in other tutorial, it is needed because -maybe - you want to use a plugin / theme action ?)
4. As already said : to demonstrate the full potential of CVE-2019-9787 you probably want a more nasty piece of code than the comment present in nginx/iframe-post.html. In my code I don't use the flaw in the Wordpress wp_filter_post_kses().
    
    
# uninstall / retry / refresh :

To stop service
>docker-compose down

To delete all containers including its volumes use
>docker rm -vf $(docker ps -a -q)

To delete all the images
>docker rmi -f $(docker images -a -q)

Don't forget to delete the repository
>cd ..
>sudo sudo rm -Rf Wordpress_CVE_2019-9787



# Intial project copied/forked to make this happened :
For the wordpress auto install :
    https://github.com/kassambara/wordpress-docker-compose
    
For the CVE proof of concept (without a autoinstall wordpress) :
    https://github.com/rkatogit/cve-2019-9787_csrf_poc
    
If there is any (official) way to link those pages to this one please let me know, I use the fork on the second one but without knowing really what I was doing :-)
    
    
    
 

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