This is a text-only version of the following page on https://raymii.org:
---
Title       : 	Patch Shellshock)with Ansible
Author      : 	Remy van Elst
Date        : 	24-09-2014
URL         : 	https://raymii.org/s/articles/Patch_CVE-2014-6271_Shellshock_with_Ansible.html
Format      : 	Markdown/HTML
---



This is a simple ansible playbook to patch Debian, CentOS, Ubuntu and
derivatives for the Shellshock vulnerability (CVE-2014-6271).

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Quoting Ars:

    
    
    The bug, discovered by Stephane Schazelas, is related to how Bash processes environmental variables passed by the operating system or by a program calling a Bash-based script. If Bash has been configured as the default system shell, it can be used by network-based attackers against servers and other Unix and Linux devices via Web requests, secure shell, telnet sessions, or other programs that use Bash to execute scripts.
    

See: for more info.

The simple playbook that fixes it, and adds the Debian 6 LTS repo where needed,
consists out of the following 3 files:

Main role:

    
    
    # cat playbooks/update.yml
     ---
     - hosts: all
       roles:
         - { role: apt-update, when: "ansible_os_family == 'Debian'" }
         - { role: yum-update, when: "ansible_os_family == 'RedHat'" }
    

Debian/Ubuntu Playbook

    
    
     # cat playbooks/roles/apt-update/tasks/main.yml
    
     - copy: src=debian-6-lts.list dest=/etc/apt/sources.list.d/debian-6-lts.list
       when: ansible_distribution_major_version == "6"
    
     #  Uncomment the following to test for the vuln.
     #
     # - shell: "export evil='() { :;}; echo vulnerable'; bash -c echo;"
     #  register: result 
    
     # - fail:
     #     msg="Not vulnerable"
     #   when: result.stdout != 'vulnerable'
    
     - apt: name=bash state=latest update_cache=yes
    

Debian 6 LTS repo file:

    
    
     # cat playbooks/roles/apt-update/files/debian-6-lts.list 
    
     # Added by Ansible to fix CVE-2014-6271 (ShellShock)
     # See http://arstechnica.com/security/2014/09/bug-in-bash-shell-creates-big-security-hole-on-anything-with-nix-in-it/
     deb http://http.debian.net/debian/ squeeze main contrib non-free
     deb-src http://http.debian.net/debian/ squeeze main contrib non-free
    
     deb http://security.debian.org/ squeeze/updates main contrib non-free
     deb-src http://security.debian.org/ squeeze/updates main contrib non-free
    
     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
    

Yum Role:

    
    
     # cat playbooks/roles/yum-update/tasks/main.yml
    
     #  Uncomment the following to test for the vuln.
     # 
     # - shell: "export evil='() { :;}; echo vulnerable'; bash -c echo;"
     #   register: result
    
     # - fail:
     #     msg="Not vulnerable"
     #   when: result.stdout != 'vulnerable'
    
     - command: /usr/bin/yum clean all
    
     - yum: name=bash state=latest
    

   [1]: https://www.digitalocean.com/?refcode=7435ae6b8212

---

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