Just a FYI and a snipit from the original
National Cyber Alert System
Technical Cyber Security Alert TA05-291A
Snort Back Orifice Preprocessor Buffer Overflow
Original release date: October 18, 2005
Last revised: --
Source: US-CERT
Systems Affected
* Snort versions 2.4.0 to 2.4.2
* Sourcefire Intrusion Sensors
Other products that use Snort or Snort components may be affected.