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 --- License: All the text on this website is free as in freedom unless stated otherwise. This means you can use it in any way you want, you can copy it, change it the way you like and republish it, as long as you release the (modified) content under the same license to give others the same freedoms you've got and place my name and a link to this site with the article as source. This site uses Google Analytics for statistics and Google Adwords for advertisements. You are tracked and Google knows everything about you. Use an adblocker like ublock-origin if you don't want it. All the code on this website is licensed under the GNU GPL v3 license unless already licensed under a license which does not allows this form of licensing or if another license is stated on that page / in that software: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Just to be clear, the information on this website is for meant for educational purposes and you use it at your own risk. I do not take responsibility if you screw something up. Use common sense, do not 'rm -rf /' as root for example. If you have any questions then do not hesitate to contact me. See https://raymii.org/s/static/About.html for details.