license.php in system-portal before 1.6.2 in op5 Monitor and op5 Appliance before 5.5.3 allows remote attackers to execute arbitrary commands via shell metacharacters in the timestamp parameter for an install action.
https://bugs.op5.com/view.php?id=5094
http://www.op5.com/news/support-news/fixed-vulnerabilities-op5-monitor-op5-appliance/
http://www.ekelow.se/file_uploads/Advisories/ekelow-aid-2012-01.pdf