MyBB Admin Control Panel Code Injection Remote Code Execution Vulnerability

March 11th, 2022
ZDI-22-503 ZDI-CAN-16517

CVE ID

CVE-2022-24734

CVSS Score

7.2 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

MyBB

Affected Products

MyBB

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of MyBB. Authentication is required to exploit this vulnerability.

The specific flaw exists within the Control Panel. The issue results from the lack of proper validation of a user-supplied string before using it to construct server-side code. An attacker can leverage this vulnerability to execute code in the context of the www-data user.

Additional Details

MyBB has issued an update to correct this vulnerability. More details can be found at:
https://mybb.com/versions/1.8.30/

Disclosure Timeline

  • 2022-03-07 - Vulnerability reported to vendor
  • 2022-03-11 - Coordinated public release of advisory

Credit

Cillian Collins

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