John Fitzpatrick (MWR InfoSecurity) talks about attack against supercomputing environments. His presentation was held at DeepSec 2013:
"We have had the luxury of spending a good amount of time looking at the security of supercomputers.
This presentation will cover our research and demonstrate some of the most interesting and significant vulnerabilities we have uncovered so far. We will also be demonstrating exploits and previously undocumented attack techniques live so you can see how to get root on 20,000 nodes all at once.
The material we are covering affects the majority of the top 500 supercomputers. But even if you have never encountered a supercomputer before you'll be surprised how accessible and familiar many of the technologies are. The UNIX crowd amongst you will certainly enjoy seeing interesting exploits against large UNIX environments."