acinclude.m4, as used in the configure script in PHP 5.5.13 and earlier, allows local users to overwrite arbitrary files via a symlink attack on the /tmp/phpglibccheck file.
https://support.apple.com/HT204659
https://bugzilla.redhat.com/show_bug.cgi?id=1104978
http://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html
http://www-01.ibm.com/support/docview.wss?uid=swg21683486
http://support.apple.com/kb/HT6443
http://seclists.org/fulldisclosure/2014/Jun/21
http://openwall.com/lists/oss-security/2014/06/06/12