Vulnerability CVE-2022-24734


Published: 2022-03-09   Modified: 2022-03-10

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.

See advisories in our WLB2 database:
Topic
Author
Date
High
MyBB 1.8.29 MyBB 1.8.29 Remote Code Execution (RCE) (Authenticated)
Altelus
17.05.2022
High
MyBB Admin Control Remote Code Execution
Christophe de la...
31.05.2022

Type:

CWE-94

(Improper Control of Generation of Code ('Code Injection'))

CVSS2 => (AV:N/AC:L/Au:S/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.5/10
6.4/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
MYBB -> MYBB 

 References:
https://mybb.com/versions/1.8.30/
https://github.com/mybb/mybb/commit/92012b9831b330714b9f9b4646a98784113489c1
https://github.com/mybb/mybb/security/advisories/GHSA-876v-gwgh-w57f
https://www.zerodayinitiative.com/advisories/ZDI-22-503/

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