CVE-2014-6271 fix for ubuntu bash

gistfile1.yml

---
- hosts: all
  user: root
  sudo: true

  tasks:
    - name: update apt
      command: apt-get update

    - name: update bash
      command: apt-get --only-upgrade install bash

    - name: check bash fix
      command: env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
      register: command_result
      failed_when: "'error' not in command_result.stderr"

I did, but it's still pulling 4.2-2 - maybe the repo I'm hitting hasn't been updated yet?:
After this operation, 0 B of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main bash amd64 4.2-2ubuntu2.2 [641 kB]
Fetched 641 kB in 0s (790 kB/s)
(Reading database ... 87088 files and directories currently installed.)
Preparing to replace bash 4.2-2ubuntu2.1 (using .../bash_4.2-2ubuntu2.2_amd64.deb) ...
Unpacking replacement bash ...
Processing triggers for man-db ...
Setting up bash (4.2-2ubuntu2.2) ...
update-alternatives: using /usr/share/man/man7/bash-builtins.7.gz to provide /usr/share/man/man7/builtins.7.gz (builtins.7.gz) in auto mode.

Does state=latest clear yum cache? (Docs aren't clear) If not may want to run 'yum clean all' prior to running

There's nothing in this playbook that first ensures the security sources are installed in ubuntu 12. Perhaps the lack of those sources is the issue for @aarongolub.

On Debian Squeeze (approximate to Ubuntu 12), I had to do this first. I don't know what the equivalent ubuntu security sources would be, but that would be the first place I would check @aarongolub.

sudo apt-get install debian-keyring debian-archive-keyring
sudo cat>>/etc/apt/sources.list.d/security.sources.list<<'EOF'
deb http://http.debian.net/debian/ squeeze-lts main contrib non-free
deb-src http://http.debian.net/debian/ squeeze-lts main contrib non-free
EOF
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install debian-security-support
sudo check-support-status
env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
foo='() { echo not patched; }' bash -c foo

As for the last task, you could use the shellshocker site script to easily check if all vulnerabilities were resolved by doing:

- name: check vulnerability status fix
  shell: curl https://shellshocker.net/shellshock_test.sh | bash
  register: command_result

- debug: var=command_result.stdout_lines