CVE-2009-5023: Improper Link Resolution Before File Access

The 1 dshield.conf, 2 mail-buffered.conf, 3 mynetwatchman.conf, and 4 mynetwatchman.conf actions in action.d/ in Fail2ban before 0.8.5 allows local users to write to arbitrary files via a symlink attack on temporary files with predictable names, as demonstrated by /tmp/fail2ban-mail.txt...