The Request Smuggling filter must be enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-268325 | IIST-SV-000220 | SV-268325r1025163_rule | CCI-000381 | medium |
| Description | ||||
| Security scans show Request Smuggling vulnerability on IIS server. The vulnerability allows a remote attacker to perform HTTP request smuggling attack. The vulnerability exists due to the way that HTTP proxies (front-end) and web servers (back-end) that do not strictly adhere to RFC standards handle sequences of HTTP requests received from multiple sources. A remote attacker can send a specially crafted request to a targeted IIS Server, perform HTTP request smuggling attack and modify responses or retrieve information from another user's HTTP session. | ||||
| STIG | Date | |||
| Microsoft IIS 10.0 Server Security Technical Implementation Guide | 2025-06-11 | |||
Details
Check Text (C-268325r1025163_chk)
Open Registry Editor.
Navigate to "HKLM\System\CurrentControlSet\Services\HTTP\Parameters"
Verify "DisableRequestSmuggling” is set to "1".
If REG_DWORD DisableRequestSmuggling is not set to 1, this is a finding.
Fix Text (F-72256r1025162_fix)
Navigate to "HKLM\System\CurrentControlSet\Services\HTTP\Parameters".
Create REG_DWORD "DisableRequestSmuggling” and set it to "1".
Note: This can be performed multiple ways; this is an example.