URLScan and percent signs

Posted by Hobbes on Stack Overflow See other posts from Stack Overflow or by Hobbes
Published on 2010-05-13T15:40:42Z Indexed on 2010/05/13 15:44 UTC
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Filed under:

iis

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urlscan

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percent

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security

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escape

So I just ran into a stupid problem in which users could not download files that had a percent sign in it. It wound up being URLScan. I had to un-set two things in urlscan.ini:

1) Set VerifyNormalization to 0 (disabled)
2) Remove the percent sign from the "DenyUrlSequences" section

Do an iisreset, and it problem solved. But the big question is: How much of a security risk is this?

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