Moodle Authenticated Spelling Binary RCE
Description
Moodle allows an authenticated user to define spellcheck settings via the web interface. The user can update the spellcheck mechanism to point to a system-installed aspell binary. By updating the path for the spellchecker to an arbitrary command, an attacker can run arbitrary commands in the context of the web application upon spellchecking requests. This module also allows an attacker to leverage another privilege escalation vuln. Using the referenced XSS vuln, an unprivileged authenticated user can steal an admin sesskey and use this to escalate privileges to that of an admin, allowing the module to pop a shell as a previously unprivileged authenticated user. This module was tested against Moodle version 2.5.2 and 2.2.3.
Author(s)
- Brandon Perry <bperry.volatile@gmail.com>
Platform
Linux,Unix
Architectures
cmd
Development
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/moodle_spelling_binary_rce
msf exploit(moodle_spelling_binary_rce) > show targets
...targets...
msf exploit(moodle_spelling_binary_rce) > set TARGET < target-id >
msf exploit(moodle_spelling_binary_rce) > show options
...show and set options...
msf exploit(moodle_spelling_binary_rce) > exploit
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