module

MyBB Admin Control Code Injection RCE

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Disclosed
2022-03-09
Created
2022-05-31

Description

This exploit module leverages an improper input validation
vulnerability in MyBB prior to `1.8.30` to execute arbitrary code in
the context of the user running the application.

MyBB Admin Control setting page calls PHP `eval` function with an
unsanitized user input. The exploit adds a new setting, injecting the
payload in the vulnerable field, and triggers its execution with a
second request. Finally, it takes care of cleaning up and removes the
setting.

Note that authentication is required for this exploit to work and the
account must have rights to add or update settings (typically, myBB
administrator role).

Authors

Cillian Collins
Altelus
Christophe De La Fuente

Platform

Linux,PHP,Unix,Windows

Architectures

php, cmd, x86, x64

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:


    msf > use exploit/multi/http/mybb_rce_cve_2022_24734
    msf exploit(mybb_rce_cve_2022_24734) > show targets
        ...targets...
    msf exploit(mybb_rce_cve_2022_24734) > set TARGET < target-id >
    msf exploit(mybb_rce_cve_2022_24734) > show options
        ...show and set options...
    msf exploit(mybb_rce_cve_2022_24734) > exploit
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