I think in world of multiple forks and vendors the most reliable way is just testing for the exploit itself, like it's done (used to be?) with JS-features in different Browsers.

The situation is similar, since alternative shells come as a compatible replacement for bash they try to mimic authentication. I.e. version number or env-vars are not that reliable.

For instance does my dash not even support the --version option 

lanx@nc10-ubuntu:~$ dash --version
dash: Illegal option --
lanx@nc10-ubuntu:~$ dash -version
dash: Illegal option -r

[download]

I already tested for symlink without success, but seems like I had a typo ...

Cheers Rolf

(addicted to the Perl Programming Language and ☆☆☆☆ :)

In reply to Re^4: The importance of avoiding the shell by LanX
in thread The importance of avoiding the shell by jhourcle

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