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Pete Finnigan's Oracle Security Weblog

This is the weblog for Pete Finnigan. Pete works in the area of Oracle security and he specialises in auditing Oracle databases for security issues. This weblog is aimed squarely at those interested in the security of their Oracle databases.

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SQL Injection and a presentation on data security

Slavik has a nice post on his blog (picked up from my Oracle blogs aggregator) titled "Blind SQL Injection in Oracle". This is a nice article that discusses SQL Injection types with nice examples for Oracle and also talks a bit about blind SQL Injection and the use of timeouts. Slavik asks if using timeouts with blind SQL Injection is a valid technique; well yes it is. Chema Alonso talked about this a couple of years ago in a paper he wrote on the Microsoft Website using SQL Server as the example. I mentioned this paper in my SQL Server Security blog (which unfortunately I have not had much time to update recently). Chema also links to the previous work by Chris Anley, David Litchfield (on Oracle as well) and others in the same area.

I also came across a paper for the CIPFA CATS Information Technology Seminar written and presented by Lindsay Hamilton titled "How Secure Are Your Personal Details?". This is quite a nice paper (beware its MS PPT not pdf) covering Data auditing and monitoring from a high level and also security assessment.

There has been 1 Comment posted on this article

October 14th, 2009 at 02:46 pm

Alexander Kornbrust says:


I think Slavik forgot to add [in Oracle] to his question "Is using timeouts as delays for blind SQL injection [in Oracle] a usable technique"

Slavik knows that timeouts in MSSQL is not a problem and he knows this technique. But have you ever seen a working example of blind sql injection using timeouts in Oracle? I am not aware of such an example but would be happy to find one.

And the presentation from Chema Alonso is about time-based (aka heavy queries) and not timeout-based blind sql injection. Chema mentions dbms_lock from Oracle but this normally can't be used in SQL queries (because it's a procedure and not a function).

Using a PL/SQL bug in dbms_export_extension could be used to inject dbms_lock.sleep, but this only works if the database is not patched properly.