[Snort-users] false positive rules in snort 2.8.6.0

JJC cummingsj at ...11827...
Fri Jun 4 17:07:10 EDT 2010


In a response model as apposed to an inline model sure... but if you are
inline then the packet doesn't make it through before Snort inspects and /
or takes action against it.

On Fri, Jun 4, 2010 at 2:28 PM, Will Metcalf <william.metcalf at ...11827...>wrote:

> Ummmm so what is happening is that these rules are written to
> fingerprint a protocol.  If I remember correctly dropping the traffic
> identified by these sigs isn't enough to cripple e-mule.  Detection !=
> Prevention...  Another example.. fire up a sniffer and and use a tcp
> session splicing attack in InlineMode() against a target...  By the
> time snort does reassembly the packets have already gone across the
> wire.
>
> Regards,
>
> Will
>
> On Fri, Jun 4, 2010 at 3:10 PM, Joel Esler <jesler at ...1935...> wrote:
> > Okay, so you aren't saying they are falsing, you are saying that the
> rules
> > aren't dropping the traffic?
> >
> > On Jun 4, 2010, at 4:00 PM, Lawrence R. Hughes, Sr. wrote:
> >
> > Joel,
> >
> > Thanks for the quick reply...
> >
> > Although they are drop rules, the clients in both cases connect, allow
> > searches and downloads.
> >
> > We do not use pcap, we thought that snort's coverage was enough.
> >
> > Our main concern is about the RIAA...
> >
> > Thanks,
> > Larry
> >
> >
> > ----- Original Message -----
> > From: Joel Esler
> > To: Lawrence R. Hughes, Sr.
> > Sent: Friday, June 04, 2010 3:55 PM
> > Subject: Re: [Snort-users] false positive rules in snort 2.8.6.0
> > What are they falsing on?  Do you have a pcap?
> > J
> > On Jun 4, 2010, at 3:50 PM, Lawrence R. Hughes, Sr. wrote:
> >
> > Hi All,
> >
> > The following two (2) rules in p2p.rules are false positives... Be aware
> of
> > the RIAA
> >
> > drop tcp $HOME_NET 4711 -> $EXTERNAL_NET any (msg:"P2P eDonkey server
> > response"
> >  flow:established,from_server; content:"Server|3A| eMule";
> >  fast_pattern:only; metadata:policy security-ips drop;
> >  reference:url,www.emule-project.net; classtype:policy-violation;
> >  sid:2587; rev:4;)
> > drop udp $HOME_NET any -> $EXTERNAL_NET 41170
> > (msg:"P2P Manolito Search Query"; flow:to_server; content:"|01 02 00
> 14|";
> >  depth:4; offset:16; metadata:policy security-ips drop;
> >  reference:url,openlito.sourceforge.net; reference:url,www.blubster.com;
> >  classtype:policy-violation; sid:3459; rev:5;)
> >
> >
> > Thanks,
> > Larry
> >
> >
> >
> >
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> > --
> > Joel Esler
> > 302-223-5974
> > Jabber: jesler at ...1935...
> >
> >
> > --
> > Joel Esler
> > 302-223-5974
> > Jabber: jesler at ...1935...
> >
> >
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