Microsoft IIS
TMA-IIS-3.8
Ensure 'MachineKey validation method - .Net 3.5' is configured
Description
The machineKey element of the ASP.NET web.config specifies the algorithm and keys that ASP.NET will use for encryption. The Machine Key feature can be managed to specify hashing and encryption settings for application services such as view state, Forms authentication, membership and roles, and anonymous identification. The following validation methods are available ... Manual review: the benchmark gives no reliable automated check for this control.
How it is checked
Audit method: Manual review
To verify the Machine Key validation method using IIS Manager: 1. Open IIS Manager and navigate to the level that was configured, the WEBROOT, or server in this case 2. In the features view, double click Machine Key 3. On the Machine Key page, verify that SHA1 is selected in the validation method dropdown
How it is fixed
Fix method: Guidance or infrastructure patch
Machine key encryption can be set by using the UI, running appcmd.exe commands, by editing configuration files directly, or by writing WMI scripts. To set the Machine Key encryption at the global level using an appcmd.exe command: %systemroot%\system32\inetsrv\appcmd set config /commit:WEBROOT /section:machineKey /validation:SHA1 Note: When Appcmd.exe is used to configure the <machineKey> element at the global level in IIS, the /commit:WEBROOT switch must be included so that configuration changes are made to the root web.config file instead of ApplicationHost.config.
Properties
- Operating systems
- Any
- Tags
- iisaspnet
- Reference
- CIS Microsoft IIS 10 Benchmark v1.2.1 - 3.8 Ensure 'MachineKey validation method - .Net 3.5' is configured