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[Don't report "self-attack vulnerabilities"] #57

robiso opened this Issue Feb 8, 2018 · 2 comments


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robiso commented Feb 8, 2018

The bugs below work only if an admin is logged and is tricked into pasting JavaScript code or uploading SVG's

WonderCMS comes with some security features and some responsibilities.

1. A logged-in user (admin) can execute JavaScript anywhere on their website.

  • This has always been a WonderCMS feature.
  • I personally don't consider this needs fixing, since a logged-in admin can do much more damage than just XSS attacks (including website defacement, malware distribution, cryptominers, ...)

2. A logged in user can upload a SVG (containing code other than an image, such as JavaScript).

  • SVG's are generally not just images, they can also include code such as JavaScript, XML, these are awesome features of SVG's.
  • Sanitizing SVG's would partially kill their functionality.
  • If there are enough wishes for this action, the SVG uploading functionality can be completely removed from WonderCMS.
  • If we already allow JavaScript to be executed at any part of the CMS, would removing the SVG functionality make any difference?

3. Host header attack.

  • This will not be considered a vulnerability until we see a live exploit of this (not local).
  • Using the Burp Suite Tool to create/show a local attack is not enough, since there needs to be a way to exploit a WonderCMS installation (and not just locally attack one-self).

How to prevent self-attack vulnerabilities

  • Avoid pasting random JavaScript code.
  • Avoid uploading random SVG's.

The list above is subject to change. All discussions are welcome.
Reporting the above issues/bugs/vulnerabilities will not include you in the WonderCMS reward system.


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robiso commented Feb 14, 2018

I'm trying to think of a reason to counter myself and ask should we remove SVG uploading functionality and why?

  • even if we remove SVG uploading, users can still INLINE SVG's with HTML, which is a good thing
  • this way we can prevent users being "tricked" into uploading malicious SVG's onto their site, since they can't see the SVG content (if someone tricks them).

Please share your opinion on this topic.
TLDR: Remove SVG uploading or not? (even if we remove it, users can inline SVG's)

  • please note we would be still supporting executing JavaScript in any part of WonderCMS as we already do.

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robiso commented Feb 15, 2018

Added additional warning for uploading SVG's on the WonderCMS download page.

Here's the safety tips:
5 safety tips to avoid being hacked

  • Change the default password and default login URL immediately.
  • Install themes and plugins only from this website.
  • Regularly update WonderCMS. Always create backups.
  • WonderCMS supports running JavaScript anywhere. Be careful not to paste random/malicious JavaScript code.
  • WonderCMS supports uploading SVG's which could also contain JavaScript code. Don't get tricked into uploading malicious SVG's. If in doubt, avoid uploading any SVG file extension.

@robiso robiso changed the title from [Don't report "self-admin vulnerabilities"] to [Don't report "self-attack vulnerabilities"] Apr 22, 2018

This was referenced Aug 17, 2018

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