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.
http://lists.apple.com/archives/security-announce/2016/Mar/msg00003.html
http://lists.opensuse.org/opensuse-updates/2015-08/msg00022.html
http://rhn.redhat.com/errata/RHSA-2015-1742.html
https://security.gentoo.org/glsa/201610-05
https://support.apple.com/HT206172
http://subversion.apache.org/security/CVE-2015-3184-advisory.txt
http://www.debian.org/security/2015/dsa-3331