Red Hat Bugzilla – Bug 440247
CVE-2008-1637 pdns-recursor: perdictable query ids
Last modified: 2015-03-02 05:33:42 EST
Amit Klein of Trusteer discovered and documented weakness in a way PowerDNS
Recursor generates DNS queries and transaction IDs used in DNS queries. This
weakness can be used to predict transaction IDs used in a subsequent queries
after observing certain amount of consequent previous queries, leading to a high
possibility of performing a successful cache poisoning attack.
PowerDNS Recursor 3.1.5 was released to address this issue.
CVE-2008-1637 was assigned to this issue:
PowerDNS Recursor before 3.1.5 uses insufficient randomness to
calculate (1) TRXID values and (2) UDP source port numbers, which
makes it easier for remote attackers to poison a DNS cache, related to
(a) algorithmic deficiencies in rand and random functions in external
libraries, (b) use of a 32-bit seed value, and (c) choice of the time
of day as the sole seeding information.
pdns-recursor-3.1.5-1.fc8 has been submitted as an update for Fedora 8
pdns-recursor-3.1.5-1.fc7 has been submitted as an update for Fedora 7
pdns-recursor-3.1.5-1.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.
pdns-recursor-3.1.5-1.fc8 has been pushed to the Fedora 8 stable repository. If problems still persist, please make note of it in this bug report.
This issue was addressed in: