ITS recently posted an announcement about problems with Apple Security Update 2012-001, affecting Mac OS X 10.6.8 users. Apple has released Security Update 2012-001 version 1.1 to address those problems, so the new version of the update can now be safely installed.
An online TidBITS article has more detailed information about the issue.
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https://www.ithaca.edu/intercom/article.php/20120206095833581