Snort mailing list archives
Re: Flowbit Warnings
From: wkitty42 () windstream net
Date: Fri, 15 Jun 2018 11:35:15 -0400
On 06/13/2018 12:44 PM, Gerry Carpinetti via Snort-sigs wrote:
I did some reading on flowbit warnings and how to fix them but after the changes I still receive the warnings. I used Notepad++ to open a rules file, than used Search -> Find In Files "selected the C:\Snort\rules folder than entered "flowbits:set" into the Find What box, I replaced all flowbits:set to flowbits:isset..
wasn't this already discussed in snort-users? you were answered over there... one of those answers was mine...
from that topic: 1. when you edited those rules, you broke them... 2. there are two rules that you can enable that will stop those warnings...3. here is my response to you in snort-users where the original discussion took place...
----->8 snip 8<----- On 06/13/2018 09:29 PM, Gerry Carpinetti via Snort-users wrote:
I have noticed some have flowbits in 2 different sections of a single line of> code for example: Flowbits:isset, file.swf; and again flowbits:set,file.swf.cff which is the Warning is set but not ever checked.
look at that very closely... it is checking if the file.swf flowbit is set... if it is and the rest of the rule matches, then the file.swf.cff flowbit is also set... now you have two flowbits set... the first indicates there is a swf file and the second indicates the swf file is utilizing the "CFF Feature count"...
So how are you going to handle one of these that has flowbits mentioned twice in a single line and some have matching SID’s. So the question is whichone are you suppose to modify when a line has 2 sections for flowbits???
you don't modify any of them! you find at least one rule that has "isset,file.swf.cff" and enable it by removing the "#" from the beginning of its line...
in the rules sets that i have, that means enabling 25681 and/or 25683... ----->8 snip 8<----- -- NOTE: No off-list assistance is given without prior approval. *Please keep mailing list traffic on the list unless* *a signed and pre-paid contract is in effect with us.* _______________________________________________ Snort-sigs mailing list Snort-sigs () lists snort org https://lists.snort.org/mailman/listinfo/snort-sigs Please visit http://blog.snort.org for the latest news about Snort! Please follow these rules: https://snort.org/faq/what-is-the-mailing-list-etiquette Visit the Snort.org to subscribe to the official Snort ruleset, make sure to stay up to date to catch the most <a href=" https://snort.org/downloads/#rule-downloads">emerging threats</a>!
Current thread:
- Flowbit Warnings Gerry Carpinetti via Snort-sigs (Jun 15)
- Re: Flowbit Warnings Alex McDonnell (Jun 15)
- Re: Flowbit Warnings wkitty42 (Jun 15)
- Re: Flowbit Warnings wkitty42 (Jun 15)
- Re: Flowbit Warnings Felix Rodríguez (Jun 15)
- Re: Flowbit Warnings wkitty42 (Jun 15)
- Re: Flowbit Warnings Felix Rodríguez (Jun 15)
- Re: Flowbit Warnings Alex McDonnell (Jun 15)