The cTrigger::DoIt function in src/ctrigger.cpp in the trigger mechanism in the daemon in Verlihub 0.9.8d-RC2 and earlier allows local users to overwrite arbitrary files via a symlink attack on the /tmp/trigger.tmp temporary file.
https://www.exploit-db.com/exploits/7183
http://www.securityfocus.com/bid/32889
http://securityreason.com/securityalert/4800