I fund a www-site http://www.searchsecurity.de/themenkanaele/plattformsicherheit/schwachstellenmanagement/allgemein/articles/106752/ (only German). I read that it is possible to do a DoS on cisco PIX 500 series and series 5500 ASA, when the TTL is enable.
How I can check that? or resolve the Problem?
Yes, if you run the command "ASA#show running-config | include decrement-ttl" and do not see TTL Enabled, then you are not affected.
What version of code are you running the Pix or ASA. Refer the "Affected Products" section for details on the affected products and versions. This should point you in the right direction.
Also, listed in the URL is Workarounds and Fixed Versions that you may want to check.