BIND 9 Cache Update From Additional Section

supriya samanta supriya.iem at
Sat Dec 12 13:23:52 UTC 2009

 Hello All,

As per ISC security bulletin *CVE-2009-4022* There is a problem with BIND 9
Cache Update From Additional Section

*Problem Description:* A Nameserver with DNSSEC validation enabled may
incorrectly add records to its cache from the additional section of
responses received during resolution of a recursive client query.This
behavior only occurs when processing client queries with checking disabled
(CD).It may occur both when requesting,and not when requesting,DNSSEC
records(DO).If the nameserver is authoritative-only this will not occur.

We have some business requirement where we need to reproduce the problem.

Could anyone advice a test case which I may use or direct me to some website
which could be useful for this purpose.

Any help will be appreciated.

Many Thanks,
Supriya Samanta

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