[Oisf-devel] small pb (FN) on suricata with content and offset+depth

[rmkml]

and if anyone confirm, Im open a ticket...
Rmkml


On Fri, 21 May 2010, rmkml wrote:

> Hi,
> I have a small pb with this sig and joigned (dns/udp) pcap file without alert 
> firing:
> alert udp any 53 -> any any (msg:"suricata test dns reply"; content:"|00 00 
> 00|"; offset:3; depth:4; classtype:bad-unknown; sid:9199437; rev:1;)
> simplified tcpdump hex output (on joigned pcap file):
> 0x0000:  4500 0028 0000 4000 3411 5152 c202 2809
> 0x0010:  0a32 0136 0035 e6e6 0014 1a16 6098 a888
> 0x0020:  0000 0000 0000 0000 0000 0000 0000
> ok udp payload start at 0x1c, on my sig, offset:3 start at 0x1f, but depth:4 
> allow me 0x1f:88 + 0x20:00 + 0x21: 00 + 0x22:00.
> Anyone confirm this small pb please?
> Tested on suricata v0.9.0 and git on date 20 may 2010 
> (b629b7c5c1e2ad6c91b97b6708ad9ddc6a674502).
>
> and of course, this sig work:
> alert udp any 53 -> any any (msg:"suricata test dns reply"; content:"|00 00 
> 00|"; offset:4; depth:3; classtype:bad-unknown; sid:9199437; rev:1;)
> Regards
> Rmkml