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