Bash bug: apply the unofficial patch now (CVE-2014-6277)(lcamtuf.blogspot.com)

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 12.04.3 LTS
  Release:	12.04
  Codename:	precise
  $ dpkg -l bash | tail -1
  ii  bash                              4.2-2ubuntu2.5               GNU Bourne Again SHell
  $ foo() { echo foo; }
  $ export -f foo
  $ env | grep BASH_FUNC
  BASH_FUNC_foo()=() {  echo foo

  $ hardening-check  /bin/dash /bin/bash
  /bin/dash:
   Position Independent Executable: yes
   Stack protected: yes
   Fortify Source functions: yes (some protected functions found)
   Read-only relocations: yes
   Immediate binding: yes
  /bin/bash:
   Position Independent Executable: no, normal executable!
   Stack protected: yes
   Fortify Source functions: yes (some protected functions found)
   Read-only relocations: yes
   Immediate binding: no, not found!

    foo='() { echo not patched; }' bash -c foo

    cd $(brew --repository)
    git remote add krishicks [email protected]:krishicks/homebrew.git
    git fetch krishicks bash
    git checkout krishicks/bash
    brew upgrade bash

    #!program

    #!program env=WHITELIST OF ENV VARS ALLOWED