An attacker can execute any ruby code he wants including system("unix command"). This effects any rails version for the last 6 years. I've written POCs for Rails 3.x and Rails 2.x on Ruby 1.9.3, Ruby 1.9.2 and Ruby 1.8.7 and there is no reason to believe this wouldn't work on any Ruby/Rails combination since when the bug has been introduced.
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[ 3.0 ms ] story [ 20.8 ms ] threadHere is the commit where it was introduced. https://github.com/rails/rails/commit/27ba5edef1c4264a8d1c0e...
Upgrade NOW.
We were probably both hovering on submit new link waiting for disclosure :)