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<remove> Element for schemeSettings (Uri Settings)

Removes a scheme setting for a scheme name.

<configuration> Element
  <uri> Element (Uri Settings)
    <schemeSettings> Element (Uri Settings)
      <remove> Element for schemeSettings (Uri Settings)
<remove 
   <name = "http|https"/>
/>

The following sections describe attributes, child elements, and parent elements.

Attributes

Attribute

Description

name

The scheme name for which this setting applies. The only supported values are name="http" and name="https".

Child Elements

None.

Parent Elements

Element

Description

<schemeSettings>

Specifies how a Uri will be parsed for specific schemes.

By default, the System.Uri class un-escapes percent encoded path delimiters before executing path compression. This was implemented as a security mechanism against attacks like the following:

http://www.contoso.com/..%2F..%2F/Windows/System32/cmd.exe?/c+dir+c:\

If this URI gets passed down to modules not handling percent encoded characters correctly, it could result in the following command being executed by the server:

c:\Windows\System32\cmd.exe /c dir c:\

For this reason, System.Uri class first un-escapes path delimiters and then applies path compression. The result of passing the malicious URL above to System.Uri class constructor results in the following URI:

http://www.microsoft.com/Windows/System32/cmd.exe?/c+dir+c:\

This default behavior can be modified to not un-escape percent encoded path delimiters using the schemeSettings configuration option for a specific scheme.

Configuration Files

This element can be used in the application configuration file or the machine configuration file (Machine.config).

The following code example shows a configuration used by the Uri class that removes any scheme settings for the http scheme.

<configuration>
  <uri>
    <schemeSettings>
      <remove name="http"/>
    </schemeSettings>
  </uri>
</configuration>

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