Re: Snort 2.9.0.1 Now Available

[Russ Combs <rcombs () sourcefire com>]

Can you send us a pcap?

On Mon, Nov 8, 2010 at 11:45 AM, L0rd Ch0de1m0rt
<l0rdch0de1m0rt () gmail com>wrote:

> Hello.
>
> I am still experiencing HTTP stream reassembly issues when trying to
> match across multiple fragmented packets with snort 2.9.0.1.
>
> Specifically, this happens on a HTTP POST where the headers are in a
> different packet than the POST data. Consider the following rule you
> can use along with scapy to reproduce if you want:
>
> alert tcp any any -> $HOME_NET $HTTP_PORTS (msg:"Incoming German POST
> to Batman"; flow:established,to_server; content:"POST"; http_method;
> uricontent:"/batcave/"; uricontent:"unicorns4sourcefire"; content:"|0d
> 0a|Accept-Language: de"; nocase; http_header; content:!"|0d 0a 0d
> 0a|not4batman=true&"; content:!"\; batsecret=sesstoken4robin";
> http_cookie; classtype:trojan-activity; sid:8008135; rev:17;)
>
> It alerts (b/c all the URI and HTTP header stuffs match in the initial
> packet) but it shouldn't alert b/c the HTTP POST data starts with
> 'not4batman=true&' (but the POST data is in a subsequent packet than
> the one containing the headers).
>
> Anyone else still having issues or have done more in-depth testing
> with 2.9.0.1 and the HTTP pre-processor?
>
> -L0rd C.
>
> On Tue, Nov 2, 2010 at 5:34 PM, Steven Sturges
> <steve.sturges () sourcefire com> wrote:
> > There was an issue in that HTTP inspect wasn't correctly handling
> > raw vs. stream reassembled packets when looking at HTTP response
> > data.  This fix is included in 2901 -- refer to ChangeLog (changes
> > to hi_client.c/hi_server.c).
> >
> > As to the support of 2.8.6, with the release of 2.9.0, 2.8.6.x
> > is no longer supported.  When there is a new "3 digit" release no
> > further patches are made to the previous version of Snort.
> >
> > On 11/1/2010 1:05 PM, L0rd Ch0de1m0rt wrote:
> > > Hello. Does this release fix the issue where the HTTP pre-processor
> > > wasn't properly examining reassembled data across fragmented packets?
> > > (I don't know the exact cause of the bug - maybe it was the other way
> > > around and Stream5 wasn't properly doing the reassebly.)  It was
> > > announced that there would be a patch for that issue, just want to see
> > > if this is it.  If so, when can we expect the 2.8.6.1 patch be
> > > released?  2.8.6.1 is still supported, right?
> > >
> > > Thanks!
> > >
> > > -L0rd C.
> > >
> > > On Mon, Nov 1, 2010 at 11:45 AM, Snort Releases <
> snortreleases () snort org> wrote:
> > > > Snort 2.9.0.1 is now available on snort.org, at
> > > > http://www.snort.org/snort-downloads/.
> > > >
> > > > 2.9.0 RC & later packages are signed with a new PGP key
> > > > (that is signed with the previous key).
> > > >
> > > > Snort 2.9.0.1 addresses the following:
> > > >
> > > >  * Fixed maximum flowbits configuration parsing to specify the number
> > > >    of bits in accordance with the Snort manual, rather than number of
> > > >    bytes.  If you have 'config flowbits_size' in your snort.conf,
> > > >    double check that it has the correct setting.
> > > >
> > > >  * Fixed a packet size issue with the IPQ and NFQ DAQs.
> > > >
> > > >  * Fixed issue with Stream5 overlap limit processing.
> > > >
> > > >  * Updated the version of LibPCRE bundled with the Windows installer.
> > > >    This update fixes a bug that caused some PCRE matches to fail
> > > >    on Windows.
> > > >
> > > > Please see the Release Notes and ChangeLog for more details.
> > > >
> > > > Please submit bugs, questions, and feedback to
> snort-beta () sourcefire com.
> > > > Happy Snorting!
> > > > The Snort Release Team
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