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Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • The TOSS SSH daemon must not allow authentication using known host's authentication.

    <VulnDiscussion>Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, ...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
    Show

  • All TOSS local files and directories must have a valid owner.

    &lt;VulnDiscussion&gt;Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier "UID" as the UI...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must require users to provide a password for privilege escalation.

    &lt;VulnDiscussion&gt;Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operat...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
    Show

  • All TOSS local interactive user accounts must be assigned a home directory upon creation.

    &lt;VulnDiscussion&gt;If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files th...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
    Show

  • Cron logging must be implemented in TOSS.

    &lt;VulnDiscussion&gt;Cron logging can be used to trace the successful or unsuccessful execution of cron jobs. It can also be used to spot intrusio...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must define default permissions for all authenticated users in such a way that the user can only read and modify their own files.

    &lt;VulnDiscussion&gt;Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary acc...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00230

    <GroupDescription></GroupDescription>
    Group
    Show

  • All TOSS local interactive user home directories must have mode 0770 or less permissive.

    &lt;VulnDiscussion&gt;Users' home directories/folders may contain information of a sensitive nature. Non-privileged users should coordinate any sha...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00230

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must not permit direct logons to the root account using remote access from outside of the system via SSH.

    &lt;VulnDiscussion&gt;Even though the communications channel may be encrypted, an additional layer of security is gained by extending the policy of...
    Rule Medium Severity
    Show

  • SRG-OS-000114-GPOS-00059

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TOSS file system automounter must be disabled unless required.

    &lt;VulnDiscussion&gt;Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity.&lt...
    Rule Medium Severity
    Show

  • SRG-OS-000120-GPOS-00061

    <GroupDescription></GroupDescription>
    Group
    Show

  • All TOSS local interactive user home directories must be owned by root.

    &lt;VulnDiscussion&gt;Users' home directories/folders may contain information of a sensitive nature. Non-privileged users should coordinate any sha...
    Rule Medium Severity
    Show

  • SRG-OS-000023-GPOS-00006

    <GroupDescription></GroupDescription>
    Group
    Show

  • SRG-OS-000480-GPOS-00230

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must prohibit the use of cached authentications after one day.

    &lt;VulnDiscussion&gt;If cached authentication information is out of date, the validity of the authentication information may be questionable. TOS...
    Rule Medium Severity
    Show

  • SRG-OS-000423-GPOS-00187

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must display the Standard Mandatory DoD Notice and Consent Banner or equivalent US Government Agency Notice and Consent Banner before granting local or remote access to the system.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to the operating system ensures privacy and se...
    Rule Medium Severity
    Show

  • SRG-OS-000066-GPOS-00034

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS, for PKI-based authentication, must validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor.

    &lt;VulnDiscussion&gt;Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate n...
    Rule Medium Severity
    Show

  • SRG-OS-000067-GPOS-00035

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS, for PKI-based authentication, must enforce authorized access to the corresponding private key.

    &lt;VulnDiscussion&gt;If the private key is discovered, an attacker can use the key to authenticate as an authorized user and gain access to the ne...
    Rule Medium Severity
    Show

  • SRG-OS-000080-GPOS-00048

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must require authentication upon booting into emergency or rescue modes.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule Medium Severity
    Show

  • SRG-OS-000109-GPOS-00056

    <GroupDescription></GroupDescription>
    Group
    Show

  • There must be no ".shosts" files on The TOSS operating system.

    &lt;VulnDiscussion&gt;The ."shosts" files are used to configure host-based authentication for individual users or the system via SSH. Host-based au...
    Rule Medium Severity
    Show

  • The TOSS pam_unix.so module must be configured in the password-auth file to use a FIPS 140-2-approved cryptographic hashing algorithm for system authentication.

    &lt;VulnDiscussion&gt;Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be r...
    Rule Medium Severity
    Show

  • SRG-OS-000120-GPOS-00061

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TOSS pam_unix.so module must be configured in the system-auth file to use a FIPS 140-2-approved cryptographic hashing algorithm for system authentication.

    &lt;VulnDiscussion&gt;Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be r...
    Rule Medium Severity
    Show

  • SRG-OS-000125-GPOS-00065

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TOSS operating system must implement DoD-approved encryption in the OpenSSL package.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule Medium Severity
    Show

  • SRG-OS-000134-GPOS-00068

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must use a Linux Security Module configured to enforce limits on system services.

    &lt;VulnDiscussion&gt;An isolation boundary provides access control and protects the integrity of the hardware, software, and firmware that perform...
    Rule Medium Severity
    Show

  • SRG-OS-000138-GPOS-00069

    <GroupDescription></GroupDescription>
    Group
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must prevent unauthorized and unintended information transfer via shared system resources.

    &lt;VulnDiscussion&gt;Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of infor...
    Rule Medium Severity
    Show

  • SRG-OS-000142-GPOS-00071

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TOSS operating system must be configured to use TCP syncookies.

    &lt;VulnDiscussion&gt;Denial of Service (DoS) is a condition when a resource is not available for legitimate users. When this occurs, the organizat...
    Rule Medium Severity
    Show

  • SRG-OS-000228-GPOS-00088

    <GroupDescription></GroupDescription>
    Group
    Show

  • TOSS must display the Standard Mandatory DoD Notice and Consent Banner or equivalent US Government Agency Notice and Consent Banner before granting local or remote access to the system via a ssh logon.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to TOSS ensures privacy and security notificat...
    Rule Low Severity
    Show

  • SRG-OS-000250-GPOS-00093

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TOSS operating system must implement DoD-approved encryption to protect the confidentiality of SSH connections.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule Medium Severity
    Show

  • SRG-OS-000250-GPOS-00093

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TOSS operating system must implement DoD-approved TLS encryption in the GnuTLS package.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Transport L...
    Rule Medium Severity
    Show

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