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SQL Injection Attacks by Example

June 7th, 2006

A customer asked that we check out his intranet site, which was used by the company´s employees and customers. This was part of a larger security review, and though we´d not actually used SQL injection to penetrate a network before, we were pretty familiar with the general concepts. We were completely successful in this engagement, and wanted to recount the steps taken as an illustration.

“SQL Injection” is subset of the an unverified/unsanitized user input vulnerability (“buffer overflows” are a different subset), and the idea is to convince the application to run SQL code that was not intended. If the application is creating SQL strings naively on the fly and then running them, it´s straightforward to create some real surprises.

We´ll note that this was a somewhat winding road with more than one wrong turn, and others with more experience will certainly have different — and better — approaches. But the fact that we were successful does suggest that we were not entirely misguided.Read Full Story

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