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PowerDNS Recursor DNS Cache Poisoning Vulnerability
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Secunia Advisory:
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SA29584
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Release Date:
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2008-03-31
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Last Update:
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2008-07-28
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Popularity:
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3,682 views
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Critical:
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Moderately critical
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Impact:
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Spoofing
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | PowerDNS Recursor 3.x
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| CVE reference: | CVE-2008-1637
CVE-2008-3217
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Description:
Amit Klein has reported a vulnerability in PowerDNS Recursor, which can be exploited by malicious people to poison the DNS cache.
The vulnerability is caused due to the application using predictable standard C library functions to generate random numbers (e.g. "rand()" and "srand()"), which are then used to create the transaction ID (TRXID) and UDP source port. This can be exploited to poison the DNS cache by guessing the transaction TRXID and the UDP source port.
The vulnerability is reported in versions prior to 3.1.5.
Solution:
Update to version 3.1.6 or later.
Provided and/or discovered by:
Amit Klein, Trusteer
Changelog:
2008-04-09: Added CVE reference.
2008-07-10: Updated "Solution" section due to the secure random generator not being used for all numbers in version 3.1.5.
2008-07-28: Added CVE reference.
Original Advisory:
PowerDNS:
http://doc.powerdns.com/changelog.html
Amit Klein:
http://www.trusteer.com/docs/powerdnsrecursor.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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