Yesterday, security researcher Jonathan Hall, of a company called Future South Technologies, accused Yahoo of having suffered a serious security breach via the recently discovered Shellshock vulnerability in Bash.
Apple Mac OS X users concerned about the Bash vulnerability dubbed Shellshock got some relief late yesterday as Apple published fixes for various versions of OS X. But if you use Mavericks you will need to install 10.9.5 before the Bash fix will work.
The “Bash Bug” or “Shellshock” vulnerability means a wide range of devices, servers and computers, including Mac OS X, will need to be patched to prevent abuse by malicious persons. Here’s advice about what to do and links to more in-depth resources.