| V-100221 | 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... |
| V-100249 | 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... |
| V-100283 | 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... |
| V-100281 | 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... |
| V-100243 | 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. |
| V-100241 | 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... |
| V-100269 | 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,... |
| V-100247 | 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... |
| V-100245 | 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... |
| V-100229 | 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... |
| V-100199 | 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... |
| V-100261 | 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... |
| V-100209 | 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... |
| V-100193 | 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... |
| V-100223 | 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... |
| V-100197 | 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... |
| V-100203 | 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... |
| V-100227 | 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... |
| V-100205 | 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... |
| V-100217 | 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... |
| V-100225 | 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... |
| V-100235 | 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... |
| V-100239 | 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... |
| V-100201 | 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... |
| V-100233 | 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... |
| V-100259 | 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... |
| V-100255 | 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. |
| V-100251 | 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... |
| V-100257 | 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... |
| V-100253 | 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... |
| V-100211 | 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... |
| V-100275 | 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... |
| V-100273 | 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... |
| V-100271 | 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. |
| V-100195 | 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... |
| V-100263 | 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... |
| V-100237 | 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... |
| V-100279 | 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... |
| V-100191 | 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... |
| V-100277 | 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... |
| V-100219 | 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... |
| V-100265 | 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,... |
| V-100285 | 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,... |
| V-100213 | 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... |
| V-100207 | 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... |
| V-100267 | 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,... |
| V-100231 | 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... |
