hostapd 0.7.3, and possibly other versions before 1.0, uses 0644 permissions for /etc/hostapd/hostapd.conf, which might allow local users to obtain sensitive information such as credentials.
https://bugzilla.redhat.com/show_bug.cgi?id=824660
https://bugzilla.novell.com/show_bug.cgi?id=740964
http://www.openwall.com/lists/oss-security/2012/05/23/5
http://www.openwall.com/lists/oss-security/2012/05/23/3
http://www.openwall.com/lists/oss-security/2012/05/23/13
http://www.mandriva.com/security/advisories?name=MDVSA-2012:168
http://lists.fedoraproject.org/pipermail/package-announce/2012-June/081983.html