Dan Kaminsky Discloses DNS Cache-Poisoning Flaw (CVE-2008-1447)
On 8 July 2008, Dan Kaminsky and DNS vendors released coordinated patches for a fundamental DNS cache-poisoning flaw (CVE-2008-1447, CERT VU#800113) affecting ISP resolvers worldwide; full details followed at Black Hat USA in August 2008.
02Deep-Dive Technical Analysis
Classic cache poisoning required waiting for a cached record to expire. Kaminsky instead made a resolver look up random, non-existent subdomains of a target domain, giving the attacker a fresh race against the legitimate answer on every query. Forged responses that guessed the 16-bit transaction ID carried authority and additional records that replaced the domain's NS delegation, so a resolver could be poisoned in seconds and silently redirect subscribers' web and mail traffic. The coordinated fix added source-port randomization, multiplying the entropy an attacker must guess; details leaked on 21 July and working exploit code appeared within days.
03Vulnerability & Exploit Flow
Transaction ID guessing against random-subdomain queries, with forged NS delegation records poisoning the resolver cache.
04Recommended Defense & Mitigation Protocol
Deploy source-port randomization, DNSSEC validation, RFC 5452 resolver hardening, restricted recursion, and anti-spoofing ingress filtering (BCP 38).
05Security Impact & Geopolitical Consequence
One of the largest multi-vendor coordinated patch efforts up to that time, it became the standing argument for DNSSEC validation and for the resolver hardening measures documented in RFC 5452.
06Authoritative Standards & External References
07Related Topic Cluster Records
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