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(more) Advanced SQL Injection
From: "Chris Anley" <chris () ngssoftware com>
Date: Tue, 18 Jun 2002 19:25:16 +0100

Hi folks,

I've written another SQL injection whitepaper; it can be found at

I'm aware that I'm running the risk of becoming a one-topic poster; if
anyone's bored, I apologise. Other stuff is in the pipeline, I promise. :o)

The paper clears up some points I glossed over in the previous paper and
introduces some new techniques, notably the use of time delays as a
communication channel to extract information from the database, and the many

If anyone has other examples of the use of time as a communication channel,
I'd be extremely interested. It seems to me to be a powerful technique,
since defence mechanisms tend to abstract it out.


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