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The DNS query id generation is vulnerable to cryptographic analysis which provides a 1 in 8 chance of guessing the next query id for 50% of the query ids. This can be used to perform cache poisoning by an attacker. This bug only affects outgoing queries, generated by BIND 9 to answer questions as a resolver, or when it is looking up data for internal uses, such as when sending NOTIFYs to slave name servers. All users are encouraged to upgrade. See also: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2926 |
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