It has been announced on Wednesday, that a serious vulnerability has been found in the bash program installed on Linux, Unix and MacOSX systems. Because this bug is a hidden open-door to your system, hackers can gain access to your system from the internet, a run programs completely taking over the system.
This is a serious problem, that if not handled quickly, and properly, will cause serious damage to your computer and Internet infrastructures since most of the computers servicing the Internet are running a Linux or Unix OS.
Heed these warnings. Read these links thoroughly and make sure you update your Linux, Unix and MacOS X systems with the latest patch for bash. Start patching immediately.