DNS Cache Poisoning - The Next Generation

    Date31 Jan 2003
    3309
    Posted ByAnthony Pell
    The old problem of DNS cache poisoning has again reared its ugly head. While some would argue that the domain name system protocol is inherently vulnerable to this style of attack due to the weakness of 16-bit transaction IDs, we cannot . . . The old problem of DNS cache poisoning has again reared its ugly head. While some would argue that the domain name system protocol is inherently vulnerable to this style of attack due to the weakness of 16-bit transaction IDs, we cannot ignore the immediate threat while waiting for something better to come along. There are new attacks, which make DNS cache poisoning trivial to execute against a large number of nameservers running today. The purpose of this article is to shed light on these new attacks and recommend ways to defend against them.

    In 1993, Christoph Schuba released a paper entitled "Addressing Weaknesses in the Domain Name System Protocol". In it, he outlined several vulnerabilities, including the technique of DNS cache poisoning. In the earliest incarnation, it was possible to provide extra information in a DNS reply packet that would be cached by the daemon. This allowed an attacker to inject false information into the DNS cache for a network, allowing them to perform man-in-the-middle attacks or other mayhem.

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