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‘Shell Shock’ command line vulnerability present in OS X, could be bigger than Heartbleed

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‘Shell Shock’ command line vulnerability present in OS X, could be bigger than Heartbleed


A vulnerability in Bash, the software program used to regulate the command shell in many flavors of Unix, has been proven to be present in OS X – with some safety researchers saying that the flaw could pose a bigger menace than the Heartbleed vulnerabilty found final yr (which affected many Unix techniques however not OS X).

The Bash vulnerability being referred to by some as ‘Shell Shock’ permits an attacker to run a variety of malicious code remotely. It was found by safety researchers at RedHat, and is described in element in a blog post.

There are conflicting stories as to the extent to which Mac customers are in danger … 

In a Stack Exchange thread, one consumer argues that whereas Macs are technically weak, most are unlikely to be in danger in follow.

Yes you're technically weak. But the truth is until you permit SSH entry from distant connections or an internet server that runs server aspect scripting, you aren't in danger. You are solely really weak if somebody you have no idea can remotely entry your machine & achieve this in a method the place a Bash command can be executed.

So this concern is especially of concern to system directors on Mac OS X & Unix/Linux servers uncovered to the world, not desktop customers who don't allow SSH sharing.

Another, nevertheless, describes this view as ‘naive.’

… or have an software operating, listening on an open port that permits RPC calls to be made that find yourself operating shell instructions. This could be any variety of issues as there are many normal purposes that do their RPC. I assume this reply could be very naïve. It’s very straightforward to be “operating an internet server” inadvertently in the course of operating an software that does some shopper-server sort factor.

The presence of the vulnerability can be confirmed by opening a Terminal window and pasting in the next command:

env x='()  :;; echo weak' bash -c 'echo good day'

A ‘weak’ response demonstrates that the exploit works, whereas a Bash warning would point out that the code failed.

Several variants of Linux have already got patches out there. Apple has not but introduced a patch.

Filed beneath: AAPL Company, Mac Tagged: Bash, Bash vulnerability, Linux, OS X, OS X vulnerability, Red Hat, Secure Shell, shell, Shell Shock, shellshock, Terminal, Unix

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