To fix this in hardy (rc7-based, probably affected) :

Difficult to extract a minimal patch from the RC8 to RC9 diff. I removed
what was obviously windowsish and the version number updates. The
problem is that the exact nature of the vulnerability doesn't seem to
have been disclosed, that the upstream fix is introducing behavioral
changes and that the real fix is drowned in a sea of security hardening
efforts. What we are looking for must be in route.c, lladdr.c, maybe in
multi.c...

I'll try to get more info from upstream.

** Attachment added: "rc8_to_rc9.diff.gz"
   http://launchpadlibrarian.net/17199440/rc8_to_rc9.diff.gz

-- 
[CVE-2008-3459] OpenVPN vulnerability allows arbitrary command execution via 
crafted configuration
https://bugs.launchpad.net/bugs/256621
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