Groklaw has posted an article on the SCO server attack. Thanks Greg.

Quote from that article:

As stated above, the attack is quite an old one. Patches to all Operating Systems that I'm aware of, do exist to stop this sort of attack. For instance, a CISCO document: http://www.cisco.com/warp/public/707/4.html describes the attack and provides ways to stop it. Note the lines: 'Employ vendor software patches to detect and circumvent the problem (if available).' This means, quite simply, that patches exist to mitigate this attack.

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Quote from that link supporting the attack theory:

The paper also does not answer the biggest question: the lack of mitigation.

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