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ISC BIND Denial of Service Vulnerabilities
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Secunia Advisory:
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SA21752
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Release Date:
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2006-09-06
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Popularity:
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13,449 views
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Critical:
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Moderately critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | ISC BIND 9.2.x
ISC BIND 9.3.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2006-4095
CVE-2006-4096
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Description:
Some vulnerabilities have been reported in BIND, which can be exploited by malicious people to cause a DoS (Denial of Service).
1) An assertion error within the processing of SIG queries can be exploited to crash either a recursive server when more than one SIG(covered) Resource Record set (RRset) is returned or an authoritative server serving a RFC 2535 DNSSEC zone where there are multiple SIG(covered) RRsets.
2) An error within the handling of multiple recursive queries can be exploited to trigger an INSIST failure by causing the response to the query to arrive after all clients looking for the response have left the recursion queue.
NOTE: According to the vendor, the vulnerabilities are likely not exploitable in the 9.2.x branch. However, a patch has been provided.
Solution:
Update to BIND 9.3.3rc2, BIND 9.3.2-P1, BIND 9.2.7rc1, or BIND 9.2.6-P1.
http://www.isc.org/index.pl?/sw/bind/
The vulnerabilities have also been fixed in BIND 9.4.0b2.
Provided and/or discovered by:
The vendor credits The Measurement Factory.
Changelog:
2006-09-06: Updated credits.
Original Advisory:
http://www.isc.org/sw/bind/bind-security.php
Other References:
US-CERT VU#697164:
http://www.kb.cert.org/vuls/id/697164
US-CERT VU#915404:
http://www.kb.cert.org/vuls/id/915404
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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