Apple Security Advisory 2013-03-14-1 - OS X Mountain Lion version 10.8.3 and Security Update 2013-001 addresses multiple vulnerabilities. These updates address a canonicalization issue with HFS and Apache, a buffer overflow in libtiff, an authentication bypass, and more.
1e8f51ffad32ee5ec0c6272e89d6a3912ef63b3f493ec6bce9c955e8f09dc3f6