trend-autoupdate.new in mailscanner 4.55.10 and other versions before 4.74.16-1 allows local users to overwrite arbitrary files via a symlink attack on a (1) /tmp/opr.ini.##### or (2) /tmp/lpt*.zip temporary file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/46725
http://www.securityfocus.com/bid/32376
http://www.mailscanner.info/ChangeLog
http://secunia.com/advisories/33117
http://secunia.com/advisories/32730