IDS mailing list archives
Detecting covert data channels?
From: "Joff Thyer" <jsthyer () gmail com>
Date: Fri, 25 May 2007 10:34:38 -0400
It is reasonably trivial to encode data within packet headers, and even encrypt said data as most are probably aware. There are past examples where control information has been sent within ICMP and other packets using header fields. My question surrounds detection; given that IDS tends to be payload focused, if a covert channel exists that has encrypted data in a packet header, how do we go about detecting it? My initial thought leans toward the fact that encrypted data blocks are statistically flat over time. Given say 'snort', how can we use this idea? I am not a snort expert by any means, so please no flames! I would be happy to summarize opinions. -Joff Thyer ------------------------------------------------------------------------ Test Your IDS Is your IDS deployed correctly?Find out quickly and easily by testing it with real-world attacks from CORE IMPACT. Go to http://www.coresecurity.com/index.php5?module=Form&action=impact&campaign=intro_sfw to learn more.
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Current thread:
- Detecting covert data channels? Joff Thyer (May 28)
- Re: Detecting covert data channels? vijay upadhyaya (May 29)
- RE: Detecting covert data channels? Omar Herrera (May 29)
- Re: Detecting covert data channels? Kowsik (May 29)
- Re: Detecting covert data channels? Eric Hacker (May 29)
- Re: Detecting covert data channels? Skip Carter (May 29)
- Re: Detecting covert data channels? Ron Gula (May 29)
- Re: Detecting covert data channels? Richard Bejtlich (May 30)
- Re: Detecting covert data channels? Jose Nazario (May 31)