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Title: Web Application Disassembly With Odbc Error Messages

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Subject: Technology
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Date: December 29, 2001
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Length: 6 / 1653
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Essay text:

In SQL queries strings are delimited by single quotes. Tacking on a -- on the end of the query stops SQL complaining about unclosed quote marks. This page is easy to by-pass using this "or" technique. Extended Introduction If this code was modified however such that an UPDATE occurred after to set, say, audit information this "or" technique would fail: As can be seen the code now has an "exec sp_audit" query so when the same request is made using the "or" technique the server produces an error: Microsoft OLE DB Provider for ODBC Drivers error '80040e14' [Microsoft][ODBC SQL Server Driver][SQL Server]Incorrect syntax near the keyword 'or'...

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In SQL queries strings are delimited by single quotes. Tacking on a -- on the end of the query stops SQL complaining about unclosed quote marks. This page is easy to by-pass using this "or" technique. Extended Introduction If this code was modified however such that an UPDATE occurred after to set, say, audit information this "or" technique would fail: As can be seen the code now has an "exec sp_audit" query so when the same request is made using the "or" technique the server produces an error: Microsoft OLE DB Provider for ODBC Drivers error '80040e14' [Microsoft][ODBC SQL Server Driver][SQL Server]Incorrect syntax near the keyword 'or'...

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