TITLE:
BIND Zone Transfer TSIG Handling Denial of Service

SECUNIA ADVISORY ID:
SA19808

VERIFY ADVISORY:
http://secunia.com/advisories/19808/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
ISC BIND 9.3.x
http://secunia.com/product/4298/
ISC BIND 9.2.x
http://secunia.com/product/75/
ISC BIND 8.x.x
http://secunia.com/product/76/
ISC BIND 4.x.x
http://secunia.com/product/740/

DESCRIPTION:
A vulnerability been reported in ISC BIND, which can be exploited by
malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the handling of
the TSIG in the second or subsequent messages in a zone transfer.
This can be exploited to crash "named" via a malformed TSIG in the
messages.

Successful exploitation requires that the first zone transfer message
have a valid TSIG.

SOLUTION:
The vulnerability will reportedly be fixed in a future release.

Do not accept zone-transfers from non-trusted nameservers.

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor based on DNS Test Tool created by Oulu University
Secure Programming Group.

ORIGINAL ADVISORY:
NISCC:
http://www.niscc.gov.uk/niscc/docs/re-20060425-00312.pdf?lang=en

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