Status Apple has released Bash security fixes for Shellshock and related vulnerabilities as "OS X bash Update 1.0". They can be installed through normal system update for people using OS X Mountain Lion v10.8.5 or OS X Mavericks v10.9.5 (they are included in Security Update 2014-005) and can also be installed manually. Official Apple fixes are also available for OS X Lion v10.7.5 and OS X Lion Ser