[Snort-users] Problem with http_inspect and Basic Authentication rule

Joel Esler jesler at ...1935...
Mon Jul 4 10:37:02 EDT 2011


Try 2.9.1 beta. 

-- 
Sent from my iPad
Please excuse the brevity

On Jul 4, 2011, at 6:31 AM, andreas <andi at ...15330...> wrote:

> Hi *,
> 
> i use snort on a mirror port. I found an issue with http_inspect
> preprocessor and one rule for authentication.
> I start snort 2.9.0.5 using "--treat-drop-as-alert -u snort -g snort -A
> fast -N -I -i eth2 -P 0 -l /var/log/snort -c /etc/snort/snort.conf".
> I also tried several options with the "preprocessor http_inspect:". The
> rule i want to see in the log file is:
> 
> "ET POLICY Outgoing Basic Auth Base64 HTTP Password detected unencrypted"
> 
> with sid:2006380, which is in "emerging-policy.rules".
> 
> I use two lynx calls to test this issue (1.1.1.1 is just an example IP):
> 
> 1. lynx --auth=foo:bar http://1.1.1.1/trac/login
> 2. lynx http://1.1.1.1/trac/browser and then navigate to login and try
> to authenticate
> 
> When http_inspect is activated, the alert only occurs with the fist
> call. If i put "disabled" to the preprocessor http_inspect the alert
> occurs on both calls. So the rule is fine and the packages are also
> fine, so i can point it down to the http_inspect. One idea is, that with
> http_inspect activated only the first HTTP Requests are handled and the
> HTTP alert for the authentication is ignored.
> 
> I tried to play with all the http_inspect options but no change except
> for the disabled option.
> 
> So any idea what i can do/try to get snort working with http_inspect and
> still reporting the alert for the authentication when the loginpage
> isn't called directly?
> 
> Andi++
> 
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