The payloads don't have data.
Before turn off these pre processors, I'm trying to understand them. I need
to calculate how many false positives the snort shows.
Thanks
----- Original Message -----
From: "Joel Esler" <eslerj@gmail.com>
To: "Angelita de Cássia Corrêa" <angelita@uol.com.br>
Cc: <snort-users@lists.sourceforge.net>
Sent: Monday, July 18, 2005 11:59 AM
Subject: Re: [Snort-users] False positive
I think the use of the words "false positive" in this instance is
wrong. A false positive indicates that what alerted a rule is not what
is actually taking place in traffic. The rule will alert on what you
have in the rule construct. Now will the "msg" of the alert match what
is actually taking place? That's what you're asking...
It's not possible (hardly) to be able to tell which of the alerts are
"false positives" without actual packet payload data.
Joel
On Jul 18, 2005, at 10:43 AM, Angelita de Cássia Corrêa wrote:
I receive many of these alerts, what are really false positives?
(http_inspect) BARE BYTE UNICODE ENCODING
(http_inspect) OVERSIZE REQUEST-URI DIRECTORY
(http_inspect) IIS UNICODE CODEPOINT ENCODING
(snort_decoder): Truncated Tcp Options
(snort_decoder): Tcp Options found with bad lengths
attempted-recon: (http_inspect) DOUBLE DECODING ATTACK
attempted-dos: ICMP PATH MTU denial of service
misc-activity: ICMP PING CyberKit 2.2 Windows
non-standard-protocol: (http_inspect) OVERSIZE CHUNK ENCODING
Thanks,
Angelita
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