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Category:   Application (Forum/Board/Portal)  >   MyBB Vendors:   MyBB Group
MyBB Bugs Permit Cross-Site Scripting, Cross-Site Request Forgery, and Email Address Spoofing Attacks
SecurityTracker Alert ID:  1033471
SecurityTracker URL:  http://securitytracker.com/id/1033471
CVE Reference:   CVE-2015-4552   (Links to External Site)
Date:  Sep 4 2015
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.8.5
Description:   Several vulnerabilities were reported in MyBB. A remote user can conduct cross-site request forgery attacks. A remote user can bypass security controls on the target system. A remote user can spoof email addresses. A remote user can conduct cross-site scripting attacks.

The 'xmlhttp.php' script does not properly filter HTML code from user-supplied input before displaying the input [CVE-2015-4552]. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the MyBB software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

The original advisory and a demonstration exploit is available at:

http://adrianhayter.com/exploits.php#CVE-2015-4552

TiberiusG reported this vulnerability.

A remote user can create a specially crafted HTML page or URL that, when loaded by the target authenticated user, will take actions on the target interface acting as the target user. The ACP mass mail cancellation function is affected.

Destroy666 reported this vulnerability.

A remote user can bypass the reset password code check in 'member.php'.

solati.sadegh reported this vulnerability.

A remote user can spoof the sender email address when sending email to a user via 'member.php'

'onlinedevelopers' reported this vulnerability.

A remote user can supply an old sid to 'search.php' to bypass a permissions check. pedder55655 reported this vulnerability.

A remote user can use the 'U+200E' Unicode character to create a username that appears to be a duplicate of another username.

mahdy2021 reported this vulnerability.

Impact:   A remote user can take actions on the target system acting as the target authenticated user.

A remote user can bypass security controls on the target system.

A remote user can spoof email addresses.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the MyBB software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Solution:   The vendor has issued a fix (1.8.5) [in May 2015].

The vendor's advisory is available at:

http://blog.mybb.com/2015/05/27/mybb-1-8-5-1-6-17-merge-system-1-8-5-release/

Vendor URL:  blog.mybb.com/2015/05/27/mybb-1-8-5-1-6-17-merge-system-1-8-5-release/ (Links to External Site)
Cause:   Access control error, Authentication error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


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