It is a very good thing that Debian and Ubuntu use /bin/dash for /bin/sh by default, since /bin/sh is implicitly invoked all over the place (e.g. by system(3)). Distros which use /bin/bash for /bin/sh are gonna have a bad time.
Edit: not implying that Debian and Ubuntu aren't affected too, just that the impact there will be lessened.
Edit: not implying that Debian and Ubuntu aren't affected too, just that the impact there will be lessened.