General Purpose Operating System Security Requirements Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The operating system must limit the number of concurrent sessions to ten for all accounts and/or account types.
Operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is hel...Rule Low Severity -
The operating system must retain a users session lock until that user reestablishes access using established identification and authentication procedures.
A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary...Rule Medium Severity -
The operating system must monitor remote access methods.
Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access man...Rule Medium Severity -
The operating system must produce audit records containing information to establish what type of events occurred.
Without establishing what type of events occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Audit record content that may be nec...Rule Medium Severity -
The operating system must produce audit records containing information to establish where the events occurred.
Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessment ...Rule Medium Severity -
The operating system must produce audit records containing information to establish the outcome of the events.
Without information about the outcome of events, security personnel cannot make an accurate assessment as to whether an attack was successful or if changes were made to the security state of the sy...Rule Medium Severity -
The operating system must produce audit records containing the individual identities of group account users.
Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the individual identities of gro...Rule Medium Severity -
The operating system must provide the capability to centrally review and analyze audit records from multiple components within the system.
Successful incident response and auditing relies on timely, accurate system information and analysis in order to allow the organization to identify and respond to potential incidents in a proficien...Rule Medium Severity -
The operating system must provide the capability to filter audit records for events of interest based upon all audit fields within audit records.
The ability to specify the event criteria that are of interest provides the individuals reviewing the logs with the ability to quickly isolate and identify these events without having to review ent...Rule Medium Severity -
The operating system must protect audit information from unauthorized read access.
Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality. Audit information includes all information (e.g., audit recor...Rule Medium Severity -
The operating system must provide audit record generation capability for DoD-defined auditable events for all operating system components.
Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit rec...Rule Medium Severity -
The operating system, for PKI-based authentication, must enforce authorized access to the corresponding private key.
If the private key is discovered, an attacker can use the key to authenticate as an authorized user and gain access to the network infrastructure. The cornerstone of the PKI is the private key us...Rule Medium Severity -
The operating system must enforce password complexity by requiring that at least one lowercase character be used.
Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resistin...Rule Medium Severity -
The operating system must require the change of at least 50 percent of the total number of characters when passwords are changed.
If the operating system allows the user to consecutively reuse extensive portions of passwords, this increases the chances of password compromise by increasing the window of opportunity for attemp...Rule Medium Severity -
The operating system must transmit only encrypted representations of passwords.
Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily c...Rule High Severity -
Operating systems must enforce a 60-day maximum password lifetime restriction.
Any password, no matter how complex, can eventually be cracked; therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force user...Rule Medium Severity -
The operating system must obscure feedback of authentication information during the authentication process to protect the information from possible exploitation/use by unauthorized individuals.
To prevent the compromise of authentication information, such as passwords during the authentication process, the feedback from the operating system shall not provide any information allowing an un...Rule Medium Severity -
The operating system must be configured to disable non-essential capabilities.
It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooke...Rule Medium Severity -
The operating system must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.
In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable...Rule Medium Severity -
The operating system must uniquely identify and must authenticate organizational users (or processes acting on behalf of organizational users).
To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system. Organizational user...Rule Medium Severity
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