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Vulnerability · Published Mar 9, 2022 · Assigned by GitHub_M

CVE-2022-24734Remote code execution in mybb

High 7.2

In plain English

A high-severity code injection in mybb from mybb. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 77.8% (higher than 99.6% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, public proof-of-concept code.

Severity (CVSS 3.1)7.2High
Exploit odds (30 days)77.8%top 0.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling2Metasploit, Public PoC

Official description

MyBB is a free and open source forum software. In affected versions the Admin CP's Settings management module does not validate setting types correctly on insertion and update, making it possible to add settings of supported type `php` with PHP code, executed on on _Change Settings_ pages. This results in a Remote Code Execution (RCE) vulnerability. The vulnerable module requires Admin CP access with the `Can manage settings?` permission. MyBB's Settings module, which allows administrators to add, edit, and delete non-default settings, stores setting data in an options code string ($options_code; mybb_settings.optionscode database column) that identifies the setting type and its options, separated by a new line character (\n). In MyBB 1.2.0, support for setting type php was added, for which the remaining part of the options code is PHP code executed on Change Settings pages (reserved for plugins and internal use). MyBB 1.8.30 resolves this issue. There are no known workarounds.

Affected products (as reported)

VendorProductVersions
mybb mybb >= 1.2.0, < 1.8.30

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References