[41424] in bugtraq
Re: DNS query spam
daemon@ATHENA.MIT.EDU (Florian Weimer)
Wed Nov 30 14:04:21 2005
From: Florian Weimer <fw@deneb.enyo.de>
To: "Josep Ma Castells" <jcb@kastells.com>
Cc: <bugtraq@securityfocus.com>
Date: Wed, 30 Nov 2005 10:20:31 +0100
In-Reply-To: <002e01c5f4b1$42a1b5d0$0203a8c0@beta> (Josep Ma Castells's
message of "Tue, 29 Nov 2005 07:50:55 +0100")
Message-ID: <87zmnmcx0g.fsf@mid.deneb.enyo.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
* Josep Ma Castells:
> I have the same problem, now I'm blocking this attempts with iptables and
> the Recent module when a number of tries is reached.
>
> This is the content of the packet:
> =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
>
> 11/20/05-19:17:37.177173 168.143.XXX.XX:11752 -> YYY.YYY.Y.YY:53
> UDP TTL:233 TOS:0x0 ID:34960 IpLen:20 DgmLen:68 DF
> Len: 48
> 0x0000: 00 07 95 C2 6A 32 00 04 76 DA CB 14 08 00 45 00 ....j2..v.....E.
> 0x0010: 00 44 88 90 40 00 E9 11 2A D5 A8 8F 71 0A C0 A8 .D..@...*...q...
> 0x0020: 04 01 2D E8 00 35 00 30 00 00 20 9E 01 00 00 01 ..-..5.0.. .....
> 0x0030: 00 00 00 00 00 01 01 65 05 6D 70 69 73 69 03 63 .......e.mpisi.c
> 0x0040: 6F 6D 00 00 FF 00 FF 00 00 29 27 10 00 00 00 00 om.......)'.....
> 0x0050: 00 00 ..
>
> =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
Interesting. This packet allegedly came from www.anonymizer.com
(168.143.113.10). It apparently has undergone NAT, so its contents
might have been garbled, but: In contrast to Piotr's packets, this one
does contain an OPT RR (type 0x29). The sender buffer length (encoded
in the class field of the RR) is set to 10000.
