Bourne Again Shell (Bash) Remote Code Execution Vulnerability

Original release date: September 24, 2014

US-CERT is aware of a Bash vulnerability affecting Unix-based operating systems such as Linux and Mac OS X. Exploitation of this vulnerability may allow a remote attacker to execute arbitrary code on an affected system.
US-CERT recommends users and administrators review the Redhat Security Blog for additional details and to refer to their respective Linux or Unix-based OS vendor(s) for an appropriate patch. A GNU Bash patch is also available for experienced users and administrators to implement.

Operating systems with updates include:

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