Sony Rootkit 感染人數

Rootkit 會去查詢、、 這些 record,於是利用 non-recursive query 就可以知道某台 DNS server 是否有 client 受到感染。

這個意思是說,如果我的電腦被裝了 Sony Rootkit,而且 為我設定的 DNS server,那麼你可以在 找到這三個 record。用 non-recursive query 的意思是說,叫 DNS server 只在他所負責 (authorized) 以及目前 cache 的部分找,如果沒找到不需要連出去找 (也就是 recursively query)。

Still More on Sony's DRM Rootkit 這篇文章裡面提到了 Kaminsky 利用 DNS non-recursively query 來估算中獎電腦的下界,結果數字大的令人驚訝,超過五十萬台 DNS server 都有:

The results have surprised Kaminsky himself: 568,200 DNS servers knew about the Sony addresses. With no other reason for people to visit them, that points to one or more computers behind those DNS servers that are Sony-compromised. That's one in six DNS servers, across a statistical sampling of a third of the 9 million DNS servers Kaminsky estimates are on the net.

請注意一件事情:像 這種超多人用的 DNS server 也只算到一筆,於是整個 HiNet ADSL 的用戶很大的一部份只被算到一次。也就是說,這篇文章暗示的數字其實遠超過五十萬。

UpdateBoing Boing 這篇 Latest Sony news: 100% of CDs with rootkits, mainstream condemnation, retailers angry 指出了在事發之前,有人透過 網頁上的 feedback form 詢問有哪些 CD 是有保護機制,結果 回答:

By the end of fiscal 2005, 100% of Sony BMG titles released will contain this content protection technology. Please assume every one of our CDs are protected in this fashion.


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