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Re: Bypassing Oracle dbms_assert
From: "David Litchfield" <davidl () ngssoftware com>
Date: Fri, 28 Jul 2006 15:20:50 +0100
I never claimed that dbms_assert is insecure nor do I recommend using
dbms_assert in this (insecure) way with three consecutive quotes. My
samples show only the generic concept of bypassing dbms_assert.
Sorry to be pedantic but this is not a generic way (concept) of bypassing
dbms_assert. Your method works only in those cases where the developer has
misunderstood how to use DBMS_ASSERT and used the incorrect function. That's
not a generic bypass technique for DBMS_ASSERT, imho. What you've found are
simply flaws in the way the developer has attempted to sanitize user input.
A generic bypass techinque for DBMS_ASSERT would work in all cases - even
where the package is being used correctly. For example, passing the name of
a VIEW as a parameter which calls nefarious functions could be employed as a
bypass technique - but even this has its problems.