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ISC BIND 9 DNSSEC Query Response Remote Cache Poisoning



The remote DNS Server is vulnerable to a remote cache-poisoning attack.


The remote DNS Server is running BIND 9 earlier than 9.4.3-P4, 9.5.2-P1, or 9.6.1-P2. Such versions may incorrectly ad 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) at the same time as requesting DNSSEC records (DO).


Upgrade to BIND 9.4.3-P4 / 9.5.2-P1 / 9.6.1-P2 or later.