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TITLE:
OpenBSD DNS Server PRNG Transaction ID Vulnerability

SECUNIA ADVISORY ID:
SA28819

VERIFY ADVISORY:
http://secunia.com/advisories/28819/

CRITICAL:
Moderately critical

IMPACT:
Spoofing

WHERE:
>From remote

OPERATING SYSTEM:
OpenBSD 3.x
http://secunia.com/product/100/
OpenBSD 4.0
http://secunia.com/product/12486/
OpenBSD 4.1
http://secunia.com/product/16044/
OpenBSD 4.2
http://secunia.com/product/16045/

DESCRIPTION:
Amit Klein has reported a vulnerability in OpenBSD, which can be
exploited by malicious people to poison the DNS cache.

The vulnerability is caused due to a weakness within the OpenBSD DNS
server's pseudo random number generator (PRNG). This can be exploited
to obtain the DNS transaction ID and poison the DNS cache.

The vulnerability is reported in OpenBSD versions 3.3 to 4.2.

SOLUTION:
Do not rely on the information returned by an OpenBSD DNS server.

PROVIDED AND/OR DISCOVERED BY:
Amit Klein, Trusteer

ORIGINAL ADVISORY:
http://www.trusteer.com/docs/dnsopenbsd.html

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