This has been addressed in Intrepid buy updating to PHP 5 here: 
https://launchpad.net/ubuntu/intrepid/+source/php5/5.2.6-1ubuntu1
Minimal patch above in this post 
https://bugs.launchpad.net/ubuntu/+source/php5/+bug/227464/comments/15
Re: test cases: I've not yet seen widely published exploit code, and I'm not 
about to change that.
Regression potential:
  It is vaguely possible the escapeshellcmd() change could have unintended 
affects, but extremely unlikely due to the limited use case
    of the function combined with necessity of using illegal characters in a 
multi-byte character set.  The patches have also been widely tested at this 
point.
  The rest are pure bug fixes with infinitesimally low chance of side effects.

-- 
Please roll out security fixes from PHP 5.2.6
https://bugs.launchpad.net/bugs/227464
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