Critical vulnerability in Bash

Number: AV14-069
Date: 24 September 2014


The purpose of this Advisory is to bring attention to a recently identified critical vulnerability in Bash.


Bash is a popular UNIX based shell or command processor and used in many Linux distributions. Exploitation of certain services and applications can allow a remote unauthenticated attacker to provide environment variables, override or bypass environment restrictions to execute shell commands and run arbitrary code.

CVE : 2014-6271

Suggested Action

CCIRC recommends that system administrators identify their affected assets and potential interdependencies with their organization’s critical services, and follow their patch management process accordingly.



Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589

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