Snort mailing list archives
RE: Encrypted sessions
From: "Abe L. Getchell" <abegetchell () home com>
Date: Wed, 28 Nov 2001 00:34:34 -0500
Hi Neil, Snort would never see the attacks in the encrypted communications between the two hosts. The data of a packet which contains an attack (should it be a web-based attack utilizing SSL or an attack against telnetd through an IPSec tunnel) would simply look like garbled data to your Snort sensor. What I would love to see is a crypto feature built into Snort much like has been built into tcpdump (compiled using './configure --with-crypto' and used at run-time using 'tcpdump -E <stuff>'), with a little more flexibility (more algorithm options, better support for the ESP RFC's, etc). If the correct key or passphrase is known, it could be provided to Snort at run-time, traffic could be decrypted on the fly by a preprocessor, and the clear text data checked against the rule set being used. The one major drawback I see to this approach is the possibility of processor saturation. A Snort box in a high-traffic environment already has it's hands full checking packets against the large number of sigs common in networks such as these. Chances are, it wouldn't have many free proc cycles to perform such a processor intensive task as decrypting data. This feature would thus only be useful in a low-traffic environment without introducing a packet loss problem. Thanks, Abe -- Abe L. Getchell Security Engineer abegetchell () home com
-----Original Message----- From: snort-users-admin () lists sourceforge net [mailto:snort-users-admin () lists sourceforge net] On Behalf Of Ronneil Camara Sent: Tuesday, November 27, 2001 3:53 PM To: snort-users () lists sourceforge net Subject: [Snort-users] Encrypted sessions How does snort deal with encrypted communication. Let say, I would to monitor https connection to my web server or we've got an encrypted connection to other mail server. Would snort know about those attacks? This is what the big vendor company mentioned to me about snort's weakness. Thanks. Neil _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/s> nort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=ort-users
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Current thread:
- Encrypted sessions Ronneil Camara (Nov 27)
- Re: Encrypted sessions Erek Adams (Nov 27)
- Re: Encrypted sessions Chr. v. Stuckrad (Nov 27)
- Re: Encrypted sessions Erek Adams (Nov 27)
- Re: Encrypted sessions Jason Haar (Nov 27)
- Re: Encrypted sessions Chr. v. Stuckrad (Nov 27)
- RE: Encrypted sessions Abe L. Getchell (Nov 27)
- RE: Encrypted sessions Erek Adams (Nov 27)
- RE: Encrypted sessions Abe L. Getchell (Nov 28)
- RE: Encrypted sessions Erek Adams (Nov 27)
- Re: Encrypted sessions Ralf Hildebrandt (Nov 27)
- Re: Encrypted sessions Ralf Hildebrandt (Nov 28)
- <Possible follow-ups>
- Re: Encrypted sessions Mike Shaw (Nov 27)
- RE: Encrypted sessions Michael Aylor (Nov 27)
- Re: Encrypted sessions Fyodor (Nov 27)
- Encrypted sessions Michael Scheidell (Nov 27)
- RE: Encrypted sessions Ronneil Camara (Nov 27)
- RE: Encrypted sessions Bob Walder (Nov 28)
(Thread continues...)
- Re: Encrypted sessions Erek Adams (Nov 27)