ISC has released a new version of BIND 8, which fixes a vulnerability allowing malicious people to poison the DNS cache.
The problem is that negative answers may be cached from the wrong source. This can be exploited to cause a "Denial of Service" against certain domains, because BIND will read the wrongly cached negative answer instead of querying the right source.
Solution: A DNS cache should only be accessible from specified IP addresses. A proper firewall filter will limit the possibilities of sending spoofed or fake answers to the DNS cache.
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