Severe Bash vulnerability affects Unix-based systems including Linux and Mac OSX
25 September 2014
The GNU Bourne Again Shell (Bash) is a command line utility widely used in many Unix-based operating systems including Linux and OS X.
Researchers have discovered a critical flaw in Bash which could allow remote code execution by an unauthenticated user. It affects all software that uses Bash and interacts with environmental variables.
Bash has been widely used for more than 20 years. This vulnerability potentially affects an extremely large range of systems, devices and services, many of which are not yet identified. Apache web servers have been identified as affected, but also countless other routers, servers, websites, computers and other devices may be vulnerable.
Due to the potential scale of this issue, it is likely attackers will seek to exploit this vulnerability over coming days.
System administrators are advised that patches have already been released by many of the major Linux vendors. You should consult your vendor for the appropriate patch. (Note that some current patches for this vulnerability do not completely fix the issue, additional patches are expected to be released soon.)
Consumers should ensure software updates are applied to their systems and devices when they become available. It is likely these will be distributed over coming days as affected products are identified and updates released by their manufacturer.
CERT Australia has issued an Advisory about the vulnerability.
The US National Vulnerability Database rates this as severity 10.
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