Microsoft IIS 10.0 Site Security Technical Implementation Guide

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: [email protected]

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Version / Release: V1R1

Published: 2020-03-24

Updated At: 2020-05-11 21:05:17

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    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-109295r1_rule IIST-SI-000201 CCI-000054 MEDIUM The IIS 10.0 website session state must be enabled. When the session information is stored on the client, the session ID, along with the user authorization and identity information, is sent along with each client request and is either stored in a cookie, embedded in the uniform resource locator (URL), or p
    SV-109297r1_rule IIST-SI-000202 CCI-000054 MEDIUM The IIS 10.0 website session state cookie settings must be configured to Use Cookies mode. When the session information is stored on the client, the session ID, along with the user authorization and identity information, is sent along with each client request and is stored in either a cookie, embedded in the uniform resource locator (URL), or p
    SV-109299r1_rule IIST-SI-000203 CCI-000068 MEDIUM A private IIS 10.0 website must only accept Secure Socket Layer (SSL) connections. Transport Layer Security (TLS) encryption is a required security setting for a private web server. Encryption of private information is essential to ensuring data confidentiality. If private information is not encrypted, it can be intercepted and easily r
    SV-109301r1_rule IIST-SI-000204 CCI-000068 MEDIUM A public IIS 10.0 website must only accept Secure Socket Layer (SSL) connections when authentication is required. Transport Layer Security (TLS) encryption is a required security setting for a private web server. Encryption of private information is essential to ensuring data confidentiality. If private information is not encrypted, it can be intercepted and easily r
    SV-109303r1_rule IIST-SI-000206 CCI-000139 MEDIUM Both the log file and Event Tracing for Windows (ETW) for each IIS 10.0 website must be enabled. Internet Information Services (IIS) on Windows Server 2012 provides basic logging capabilities. However, because IIS takes some time to flush logs to disk, administrators do not have access to logging information in real-time. In addition, text-based log
    SV-109305r1_rule IIST-SI-000208 CCI-000133 MEDIUM An IIS 10.0 website behind a load balancer or proxy server must produce log records containing the source client IP, and destination information. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the correct source (e.g., source IP), of the events is important dur
    SV-109307r1_rule IIST-SI-000209 CCI-000134 MEDIUM The IIS 10.0 website must produce log records that contain sufficient information to establish the outcome (success or failure) of IIS 10.0 website events. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the success or failure of an event is important during forensic analy
    SV-109309r1_rule IIST-SI-000210 CCI-001487 MEDIUM The IIS 10.0 website must produce log records containing sufficient information to establish the identity of any user/subject or process associated with an event. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Determining user accounts, processes running on behalf of the user, and running pr
    SV-109311r1_rule IIST-SI-000214 CCI-000381 MEDIUM The IIS 10.0 website must have Multipurpose Internet Mail Extensions (MIME) that invoke OS shell programs disabled. Controlling what a user of a hosted application can access is part of the security posture of the web server. Any time a user can access more functionality than is needed for the operation of the hosted application poses a security issue. A user with too
    SV-109313r1_rule IIST-SI-000215 CCI-000381 MEDIUM Mappings to unused and vulnerable scripts on the IIS 10.0 website must be removed. IIS 10.0 will either allow or deny script execution based on file extension. The ability to control script execution is controlled through two features with IIS 10.0, Request Filtering and Handler Mappings. For Handler Mappings, the ISSO must document an
    SV-109315r1_rule IIST-SI-000216 CCI-000381 MEDIUM The IIS 10.0 website must have resource mappings set to disable the serving of certain file types. IIS 10.0 will either allow or deny script execution based on file extension. The ability to control script execution is controlled through two features with IIS 10.0, Request Filtering and Handler Mappings. For Request Filtering, the ISSO must document a
    SV-109317r1_rule IIST-SI-000217 CCI-000381 MEDIUM The IIS 10.0 website must have Web Distributed Authoring and Versioning (WebDAV) disabled. A web server can be installed with functionality that by its nature is not secure. Web Distributed Authoring (WebDAV) is an extension to the HTTP protocol that, when developed, was meant to allow users to create, change, and move documents on a server, ty
    SV-109319r1_rule IIST-SI-000218 CCI-000381 MEDIUM The IIS 10.0 production website must configure the Global .NET Trust Level. A web server may host too many applications. Each application will need certain system resources and privileged operations to operate correctly. An application's trust level determines the permissions granted by the ASP.NET Code Access Security (CAS) poli
    SV-109321r1_rule IIST-SI-000219 CCI-000382 MEDIUM Each IIS 10.0 website must be assigned a default host header. The web server must be configured to listen on a specified IP address and port. Without specifying an IP address and port for the web server to use, the web server will listen on all IP addresses available to the hosting server. If the web server has mult
    SV-109323r1_rule IIST-SI-000220 CCI-000197 MEDIUM A private IIS 10.0 website authentication mechanism must use client certificates to transmit session identifier to assure integrity. A DoD private website must use PKI as an authentication mechanism for web users. Information systems residing behind web servers requiring authorization based on individual identity must use the identity provided by certificate-based authentication to sup
    SV-109325r1_rule IIST-SI-000221 CCI-001082 HIGH Anonymous IIS 10.0 website access accounts must be restricted. Many of the security problems that occur are not the result of a user gaining access to files or data for which the user does not have permissions, but rather users are assigned incorrect permissions to unauthorized data. The files, directories, and data
    SV-109327r1_rule IIST-SI-000223 CCI-001188 MEDIUM The IIS 10.0 website must generate unique session identifiers that cannot be reliably reproduced. Communication between a client and the web server is done using the HTTP protocol, but HTTP is a stateless protocol. To maintain a connection or session, a web server will generate a session identifier (ID) for each client session when the session is init
    SV-109329r1_rule IIST-SI-000224 CCI-001084 MEDIUM The IIS 10.0 website document directory must be in a separate partition from the IIS 10.0 websites system files. The web document (home) directory is accessed by multiple anonymous users when the web server is in production. By locating the web document (home) directory on the same partition as the web server system file, the risk for unauthorized access to these pr
    SV-109331r1_rule IIST-SI-000225 CCI-001094 MEDIUM The IIS 10.0 website must be configured to limit the maxURL. Request filtering replaces URLScan in IIS, enabling administrators to create a more granular rule set with which to allow or reject inbound web content. By setting limits on web requests, it helps to ensure availability of web services and may also help m
    SV-109333r1_rule IIST-SI-000226 CCI-001094 MEDIUM The IIS 10.0 website must be configured to limit the size of web requests. By setting limits on web requests, it ensures availability of web services and mitigates the risk of buffer overflow type attacks. The maxAllowedContentLength Request Filter limits the number of bytes the server will accept in a request.
    SV-109335r1_rule IIST-SI-000227 CCI-001094 MEDIUM The IIS 10.0 websites Maximum Query String limit must be configured. Setting limits on web requests helps to ensure availability of web services and may also help mitigate the risk of buffer overflow type attacks. The Maximum Query String Request Filter describes the upper limit on allowable query string lengths. Upon exce
    SV-109337r1_rule IIST-SI-000228 CCI-001094 MEDIUM Non-ASCII characters in URLs must be prohibited by any IIS 10.0 website. Setting limits on web requests ensures availability of web services and mitigates the risk of buffer overflow type attacks. The allow high-bit characters Request Filter enables rejection of requests containing non-ASCII characters.
    SV-109339r1_rule IIST-SI-000229 CCI-001094 MEDIUM Double encoded URL requests must be prohibited by any IIS 10.0 website. Request filtering enables administrators to create a more granular rule set with which to allow or reject inbound web content. Setting limits on web requests ensures availability of web services and mitigates the risk of buffer overflow type attacks. When
    SV-109341r1_rule IIST-SI-000230 CCI-001094 MEDIUM Unlisted file extensions in URL requests must be filtered by any IIS 10.0 website. Request filtering enables administrators to create a more granular rule set to allow or reject inbound web content. Setting limits on web requests helps to ensure availability of web services and may also help mitigate the risk of buffer overflow type att
    SV-109343r1_rule IIST-SI-000231 CCI-001310 MEDIUM Directory Browsing on the IIS 10.0 website must be disabled. Directory browsing allows the contents of a directory to be displayed upon request from a web client. If directory browsing is enabled for a directory in IIS, users could receive a web page listing the contents of the directory. If directory browsing is e
    SV-109345r1_rule IIST-SI-000233 CCI-001312 MEDIUM Warning and error messages displayed to clients must be modified to minimize the identity of the IIS 10.0 website, patches, loaded modules, and directory paths. HTTP error pages contain information that could enable an attacker to gain access to an information system. Failure to prevent the sending of HTTP error pages with full information to remote requesters exposes internal configuration information to potenti
    SV-109347r1_rule IIST-SI-000234 CCI-001312 MEDIUM Debugging and trace information used to diagnose the IIS 10.0 website must be disabled. Setting compilation debug to false ensures detailed error information does not inadvertently display during live application usage, mitigating the risk of application information being displayed to users.
    SV-109349r1_rule IIST-SI-000235 CCI-002361 MEDIUM The Idle Time-out monitor for each IIS 10.0 website must be enabled. The idle time-out attribute controls the amount of time a worker process will remain idle before it shuts down. A worker process is idle if it is not processing requests and no new requests are received. The purpose of this attribute is to conserve syste
    SV-109351r1_rule IIST-SI-000236 CCI-002361 MEDIUM The IIS 10.0 websites connectionTimeout setting must be explicitly configured to disconnect an idle session. Leaving sessions open indefinitely is a major security risk. An attacker can easily use an already authenticated session to access the hosted application as the previously authenticated user. By closing sessions after a set period of inactivity, the web s
    SV-109353r1_rule IIST-SI-000237 CCI-002322 MEDIUM The IIS 10.0 website must provide the capability to immediately disconnect or disable remote access to the hosted applications. During an attack on the web server or any of the hosted applications, the system administrator may need to disconnect or disable access by users to stop the attack. The web server must provide a capability to disconnect users to a hosted application with
    SV-109355r1_rule IIST-SI-000238 CCI-001849 MEDIUM The IIS 10.0 website must use a logging mechanism configured to allocate log record storage capacity large enough to accommodate the logging requirements of the IIS 10.0 website. To make certain the logging mechanism used by the web server has sufficient storage capacity in which to write the logs, the logging mechanism must be able to allocate log record storage capacity. The task of allocating log record storage capacity is usu
    SV-109357r1_rule IIST-SI-000239 CCI-001762 MEDIUM The IIS 10.0 websites must use ports, protocols, and services according to Ports, Protocols, and Services Management (PPSM) guidelines. Web servers provide numerous processes, features, and functionalities that use TCP/IP ports. Some of these processes may be deemed unnecessary or too unsecure to run on a production system. The web server must provide the capability to disable or deactiv
    SV-109359r1_rule IIST-SI-000241 CCI-002470 MEDIUM The IIS 10.0 website must only accept client certificates issued by DoD PKI or DoD-approved PKI Certification Authorities (CAs). The use of a DoD PKI certificate ensures clients the private website they are connecting to is legitimate, and is an essential part of the DoD defense-in-depth strategy.
    SV-109361r1_rule IIST-SI-000242 CCI-002476 MEDIUM The IIS 10.0 private website must employ cryptographic mechanisms (TLS) and require client certificates. When data is written to digital media, such as hard drives, mobile computers, external/removable hard drives, personal digital assistants, flash/thumb drives, etc., there is risk of data loss and data compromise. User identities and passwords stored on th
    SV-109363r1_rule IIST-SI-000244 CCI-002418 MEDIUM IIS 10.0 website session IDs must be sent to the client using TLS. The HTTP protocol is a stateless protocol. To maintain a session, a session identifier is used. The session identifier is a piece of data used to identify a session and a user. If the session identifier is compromised by an attacker, the session can be hi
    SV-109365r1_rule IIST-SI-000246 CCI-002418 MEDIUM Cookies exchanged between the IIS 10.0 website and the client must have cookie properties set to prohibit client-side scripts from reading the cookie data. A cookie can be read by client-side scripts easily if cookie properties are not set properly. By allowing cookies to be read by the client-side scripts, information such as session identifiers could be compromised and used by an attacker who intercepts th
    SV-109367r1_rule IIST-SI-000251 CCI-000366 MEDIUM The IIS 10.0 website must have a unique application pool. Application pools isolate sites and applications to address reliability, availability, and security issues. Sites and applications may be grouped according to configurations, although each site will be associated with a unique application pool.
    SV-109369r1_rule IIST-SI-000252 CCI-000366 MEDIUM The maximum number of requests an application pool can process for each IIS 10.0 website must be explicitly set. IIS application pools can be periodically recycled to avoid unstable states possibly leading to application crashes, hangs, or memory leaks. By default, application pool recycling is overlapped, which means the worker process to be shut down is kept runni
    SV-109371r1_rule IIST-SI-000253 CCI-000366 MEDIUM The amount of virtual memory an application pool uses for each IIS 10.0 website must be explicitly set. IIS application pools can be periodically recycled to avoid unstable states possibly leading to application crashes, hangs, or memory leaks. By default, application pool recycling is overlapped, which means the worker process to be shut down is kept runni
    SV-109373r1_rule IIST-SI-000254 CCI-000366 MEDIUM The amount of private memory an application pool uses for each IIS 10.0 website must be explicitly set. IIS application pools can be periodically recycled to avoid unstable states possibly leading to application crashes, hangs, or memory leaks. By default, application pool recycling is overlapped, which means the worker process to be shut down is kept runni
    SV-109375r1_rule IIST-SI-000255 CCI-000366 MEDIUM The application pool for each IIS 10.0 website must have a recycle time explicitly set. Application pools can be periodically recycled to avoid unstable states possibly leading to application crashes, hangs, or memory leaks.
    SV-109377r1_rule IIST-SI-000257 CCI-000366 MEDIUM The application pools pinging monitor for each IIS 10.0 website must be enabled. Windows Process Activation Service (WAS) manages application pool configurations and may flag a worker process as unhealthy and shut it down. An application pool’s pinging monitor must be enabled to confirm worker processes are functional. A lack of res
    SV-109379r1_rule IIST-SI-000258 CCI-000366 MEDIUM The application pools rapid fail protection for each IIS 10.0 website must be enabled. Rapid fail protection is a feature that interrogates the health of worker processes associated with websites and web applications. It can be configured to perform a number of actions such as shutting down and restarting worker processes that have reached
    SV-109381r1_rule IIST-SI-000259 CCI-000366 MEDIUM The application pools rapid fail protection settings for each IIS 10.0 website must be managed. Windows Process Activation Service (WAS) manages application pool configuration and may flag a worker process as unhealthy and shut it down. The rapid fail protection must be set to a suitable value. A lack of response from the worker process might mean t
    SV-109383r1_rule IIST-SI-000261 CCI-000381 MEDIUM Interactive scripts on the IIS 10.0 web server must be located in unique and designated folders. CGI and ASP scripts represent one of the most common and exploitable means of compromising a web server. All CGI and ASP program files must be segregated into their own unique folder to simplify the protection of these files. ASP scripts must be placed in
    SV-109385r1_rule IIST-SI-000262 CCI-000381 MEDIUM Interactive scripts on the IIS 10.0 web server must have restrictive access controls. CGI is a programming standard for interfacing external applications with information servers, such as HTTP or web servers. CGI, represented by all upper case letters, should not be confused with the .cgi file extension. The .cgi file extension does repres
    SV-109387r1_rule IIST-SI-000263 CCI-000381 MEDIUM Backup interactive scripts on the IIS 10.0 server must be removed. Copies of backup files will not execute on the server, but they can be read by the anonymous user if special precautions are not taken. Such backup copies contain the same sensitive information as the actual script being executed and, as such, are useful
    SV-109389r1_rule IIST-SI-000264 CCI-000366 MEDIUM The required DoD banner page must be displayed to authenticated users accessing a DoD private website. A consent banner will be in place to inform prospective entrants the website they are about to enter is a DoD website and their activity is subject to monitoring. The document, DoDI 8500.01, establishes the policy on the use of DoD information systems. It