Re: just something to note about ftpbounce keyword.

[Steven Sturges <steve.sturges () sourcefire com>]

Why not just use the ftp bounce detection in the ftp/telnet
preprocessor?  The rule option was only added as a precursor
to that, as development/test for a rule option is much simpler
than that of a preprocessor.

Will Metcalf wrote:
> Also looks like we can't match on anything after the PORT command...
>
> PORT 192,168,2,1,0,111
>
> #fails
> alert tcp any any -> any any (msg:"ftpbounce depth content 192";
> content:"192"; ftpbounce; classtype:bad-unknown; sid:27; rev:1;)
>
> #fails
> alert tcp any any -> any any (msg:"ftpbounce depth content 111";
> content:"111"; ftpbounce; classtype:bad-unknown; sid:28; rev:1;)
>
> #works
> alert tcp any any -> any any (msg:"ftpbounce depth content PORT";
> content:"PORT"; ftpbounce; classtype:bad-unknown; sid:29; rev:1;)
>
> Regards,
>
> Will
>
> On Wed, Mar 17, 2010 at 4:23 PM, Will Metcalf <william.metcalf () gmail com> wrote:
> > I can't really see a valid use case here as the ftpbounce keyword is
> > used in all of like one rule but.....
> >
> > Regards,
> >
> > Will
> >
> > #test 128 ftpbounce byte_test + relative
> > #fails
> > #
> > #file ftpbounceattack.pcap
> > alert tcp any any -> any any (msg:"ftpbounce + byte_test + relative";
> > content:"P"; byte_test:1,=,82,1,relative; ftpbounce;
> > classtype:bad-unknown; sid:128; rev:1;)
> >
> > #test 129 byte_test + relative
> > #works
> > #
> > #file ftpbounceattack.pcap
> > alert tcp any any -> any any (msg:"ftpbounce + byte_test + relative";
> > content:"P"; byte_test:1,=,82,1,relative;  classtype:bad-unknown;
> > sid:129; rev:1;)
>
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