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Check: IIST-SV-000210

Microsoft IIS 10.0 Server STIG: IIST-SV-000210 (in versions v2 r10 through v2 r3)

Title

HTTPAPI Server version must be removed from the HTTP Response Header information. (Cat III impact)

Discussion

HTTP Response Headers contain information that could enable an attacker to gain access to an information system. Failure to prevent the sending of certain HTTP Response Header information to remote requesters exposes internal configuration information to potential attackers.

Check Content

Open Registry Editor. Navigate to “HKLM\System\CurrentControlSet\Services\HTTP\Parameters” Verify “DisableServerHeader” is set to “1”. If REG_DWORD DisableServerHeader is not set to 1, this is a finding. If the System Administrator can show that Server Version information has been removed via other means, such as using a rewrite outbound rule, this is not a finding.

Fix Text

Navigate to “HKLM\System\CurrentControlSet\Services\HTTP\Parameters”. Create REG_DWORD “DisableServerHeader” and set it to “1”. Note: This can be performed multiple ways, this is an example.

Additional Identifiers

Rule ID: SV-241788r879655_rule

Vulnerability ID: V-241788

Group Title: SRG-APP-000266-WSR-000159

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CCIs

CCIs tied to check.

Number	Definition
CCI-001312	The information system generates error messages that provide information necessary for corrective actions without revealing information that could be exploited by adversaries.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
SI-11	Error Handling