full-disclosure - Re: Semi 0day DNS Invalid Compression attack

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Date: Mon, 11 Jul 2011 17:31:10 +0400
From: Kai <kai@...nn.net>
To: David <codeinjection@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Semi 0day DNS Invalid Compression attack

 Hi,

 tested on isc bind 9.7.3, on opensuse 11.4.
 sent a few packets to myself:

 --> [1000000]: (127.0.0.1)->(127.0.0.1)
 --> Done.

 and named felt beautiful along the test:

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  2844 named     20   0  111m  22m 2456 S    0  0.2   0:00.09 named

 named -V:

 BIND 9.7.3 built with '--prefix=/usr' '--bindir=/usr/bin' 
 '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--localstatedir=/var' 
 '--libdir=/usr/lib' '--includedir=/usr/include/bind' 
 '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-openssl' 
 '--enable-threads' '--with-libtool' '--enable-runidn' '--with-libxml2' 
 '--with-dlz-mysql' '--with-dlz-ldap' '--with-gssapi' 
 'CFLAGS=-fomit-frame-pointer -fmessage-length=0 -O2 -Wall 
 -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables 
 -fasynchronous-unwind-tables -g -fno-strict-aliasing' 
 'LDFLAGS=-L/usr/lib'

 you said that packet was like
> # 4500 002b 512f 4000 3411 92a9 2989 601e

 so i've changed packet header to 
 "\x45\x00\x00\x2b\x51\x2f\x40\x00\x34\x11\x92\xa9" and length to 
 "\x00\x4a" (74, right?) but still no look. Any thoughts?


-- 
 Cheers,

 Kai

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