30 lines
1.6 KiB
Markdown
30 lines
1.6 KiB
Markdown
|
## "dataAnnotations:dataTypeAttribute:disableRegEx" app setting is on by default in .NET Framework 4.7.2
|
||
|
|
|
||
|
|
### Scope
|
||
|
|
Minor
|
||
|
|
|
||
|
|
### Version Introduced
|
||
|
|
4.7.2
|
||
|
|
|
||
|
|
### Change Description
|
||
|
|
In .NET Framework 4.6.1, an app setting (`"dataAnnotations:dataTypeAttribute:disableRegEx"`) was introduced that allows users to disable the use of regular expressions in data type attributes (such as <xref:System.ComponentModel.DataAnnotations.EmailAddressAttribute?displayProperty=nameWithType>, <xref:System.ComponentModel.DataAnnotations.UrlAttribute?displayProperty=nameWithType>, and <xref:System.ComponentModel.DataAnnotations.PhoneAttribute?displayProperty=nameWithType>). This helps to reduce security vulnerability such as avoiding the possibility of a Denial of Service attack using specific regular expressions.<br/>
|
||
|
|
|
||
|
|
In .NET Framework 4.6.1, this app setting to disable RegEx usage was set to `false` by default. Staring with .NET Framework 4.7.2, this config switch is set to `true` by default to further reduce secure vulnerability for web applications that target .NET Framework 4.7.2 and above.
|
||
|
|
|
||
|
|
|
||
|
|
### Recommended Action
|
||
|
|
If you find that regular expressions in your web application do not work after upgrading to .NET Framework 4.7.2, you can update the value of the `"dataAnnotations:dataTypeAttribute:disableRegEx"` setting to `false` to revert to the previous behavior.
|
||
|
|
|
||
|
|
```xml
|
||
|
|
<configuration>
|
||
|
|
<appsettings>
|
||
|
|
...
|
||
|
|
<add key="dataAnnotations:dataTypeAttribute:disableRegEx" value="false"/>
|
||
|
|
...
|
||
|
|
</appsettings>
|
||
|
|
</configuration>
|
||
|
|
```
|
||
|
|
|
||
|
|
### Category
|
||
|
|
Web Application
|