Buy custom Web Application Disassembly With Odbc Error Messages
Essay's paper info
| Topic: |
Technology
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| Number of pages / Number of words: |
6 / 1653 |
Essay's paper body
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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At this point the login has failed and assuming the attacker does not have access the source of the ASP code, how can this login screen by by-passed?
Down to business
To do this the web application needs to be disassembled and this is done by using ODBC error messages.
The attacker would start by requesting
http://127...
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