Snort mailing list archives

Re: base64 for http_inspect


From: Joel Esler <jesler () sourcefire com>
Date: Fri, 30 Jul 2010 17:17:25 -0400

Paul,

Most of everyone who can properly answer this question is at Blackhat/Defcon.  I know there is more base64 decoding in 
snort-2.9.0.  I don't want to speculate on why we you are seeing it in snort-2.8.6.1.  

J

On Jul 30, 2010, at 3:41 PM, Paul Schmehl wrote:

Would someone please explain this statement in the README.http_inspect doc for 
snort 2.8.6.1?

--Options Available Under Stateful Inspection--

* base64 [yes/no] *

Enables base64 decoding of certain fields where stateful inspection
determines that base64 encoding is present.

I've tried the following:

Adding base64 yes to the global config - fails
Adding base64 yes to a server profile - fails
Adding a separate line as follows:
preprocessor http_inspect: stateful inspection base64 yes - fails

How do you implement base64 decoding for http_inspect?

-- 
Paul Schmehl, Senior Infosec Analyst
As if it wasn't already obvious, my opinions
are my own and not those of my employer.
*******************************************
"It is as useless to argue with those who have
renounced the use of reason as to administer
medication to the dead." Thomas Jefferson


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