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The production website must utilize SHA1 encryption for Machine Key.


Overview

Finding ID Version Rule ID IA Controls Severity
V-26026 WA000-WI6180 IIS7 SV-33314r4_rule Medium
Description
The Machine Key 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. Ensuring a strong encryption method can mitigate the risk of data tampering in crucial functional areas such as forms authentication cookies or view state.
STIG Date
IIS 7.0 Site STIG 2019-05-15

Details

Check Text ( C-32882r5_chk )
1. Open the "IIS Manager".
2. Click the site name under review.
3. Double-click the "Machine Key" in the website "Home Pane".
4. Ensure "SHA1" is selected for the "Validation method".

If not, this is a finding.
Fix Text (F-29031r4_fix)
1. Open the "IIS Manager".
2. Click the site name under review.
3. Double-click the "Machine Key" in the website "Home Pane".
4. Set the "Validation method" to "SHA1".