Thanks to Gebhard for letting us know about a new vulnerability in Apache Struts.

If you recall the classloader vulnerability of few months ago, the fix for that seems to be case and punctuation sensitive (using [] instead of "."  was not accounted for)

In any case, they have posted a mitigation how-to here: http://struts.apache.org/announce.html#a20140424

This affects all versions up to 2.3.16.1

Find more information on this here:
http://www.pwntester.com/blog/2014/04/24/struts2-0day-in-the-wild/

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Rob VandenBrink
Metafore