The Gentoo Nullmailer package before 1.11-r2 uses world-readable permissions for /etc/nullmailer/remotes, which allows local users to obtain SMTP authentication credentials by reading the file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/86384
https://bugs.gentoo.org/show_bug.cgi?id=480376
http://www.securityfocus.com/bid/61743
http://seclists.org/oss-sec/2013/q3/339