mod_authz_svn in Apache Subversion 1.7.x before 1.7.21 and 1.8.x before 1.8.14, when using Apache httpd 2.4.x, does not properly restrict anonymous access, which allows remote anonymous users to read hidden files via the path name.
https://support.apple.com/HT206172
https://security.gentoo.org/glsa/201610-05
http://www.ubuntu.com/usn/USN-2721-1
http://www.securitytracker.com/id/1033215
http://www.securityfocus.com/bid/76274
http://www.debian.org/security/2015/dsa-3331
http://subversion.apache.org/security/CVE-2015-3184-advisory.txt
http://rhn.redhat.com/errata/RHSA-2015-1742.html
http://lists.opensuse.org/opensuse-updates/2015-08/msg00022.html
http://lists.apple.com/archives/security-announce/2016/Mar/msg00003.html