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OpenBSD DNS Server PRNG Transaction ID Vulnerability
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Secunia Advisory:
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SA28819
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Release Date:
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2008-02-07
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Last Update:
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2008-03-14
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Critical:
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Moderately critical
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Impact:
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Spoofing
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| OS: | OpenBSD 3.x
OpenBSD 4.0
OpenBSD 4.1
OpenBSD 4.2
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| | CVE reference: | CVE-2008-1146 (Secunia mirror)
CVE-2008-1147 (Secunia mirror)
CVE-2008-1148 (Secunia mirror)
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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.
Fixed in the CVS repository.
http://www.openbsd.org/cgi-bin/cvsweb...amp;content-type=text/x-cvsweb-markup
Provided and/or discovered by:
Amit Klein, Trusteer
Changelog:
2008-03-11: Added CVE reference.
2008-03-14: Updated "Solution" section.
Original Advisory:
http://www.trusteer.com/docs/dnsopenbsd.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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