Moodle through 2.5.2 allows remote authenticated administrators to execute arbitrary programs by configuring the aspell pathname and then triggering a spell-check operation within the TinyMCE editor.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-3630
• https://community.rapid7.com/community/metasploit/blog/2013/10/30/seven-foss-disclosures-part-one
• https://community.rapid7.com/community/metasploit/blog/2013/10/30/seven-tricks-and-treats
• http://packetstormsecurity.com/files/164479/Moodle-Authenticated-Spelling-Binary-Remote-Code-Execution.html