Cisco Security Patch Released
Cisco has announced multiple products are vulnerable to a DNS cache poisoning attack due to their use of insufficiently randomized DNS transaction IDs and UDP source ports in the DNS queries they produce.
This may allow an attacker to more easily forge DNS answers that can poison DNS caches.
To exploit this vulnerability an attacker must be able to cause a vulnerable DNS server to perform recursive DNS queries. Therefore, DNS servers that are only authoritative, or servers where recursion is not allowed, are not affected.
Cisco has released free software updates that address this vulnerability.
The Cisco Security Advisory
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1 Comment
comments.show.hideJul 18, 2008
Editor
I found another interesting reference at US-CERT with more detail info. http://www.kb.cert.org/vuls/id/800113