Validate a XPath query in asp.net to avoid XPath-Injection

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hi I am creating a sample login application which will authenticate all the valid users but, I am storing my username and passwords in a xml file. My code is working for valid credential as well as invalid credential like xpath injection code ' or '1' = '1. I am banging my head to overcome this I have gone through XPathDocument, XPathNavigator, XPathExpression, XPathNodeIterator but still the same output. Please suggest me how would I do without any third party dll.

Posted 29-Jul-13 21:05pm

Prafulla Sahu

Updated 29-Jul-13 21:34pm

Joezer BH

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**Joezer BH** · Answer 1 · 2013-07-29T21:30:00

Hi Prafulla,

If you can deny usage of apostrophe in the string that you store, that would be an up front solution.

The preferred solution of course is the usage of variables, this goes for SQL Injection as well as the less known XPath Injection.

Read\watch more about Injection
XPath Injection Exploitation[^]
How to prevent XPath/XML injection in .NET[^]
SQL Injection Attacks and Some Tips on How to Prevent Them[^]

Good luck,
Edo