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II - Mission Support Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-OS-000033

    <GroupDescription></GroupDescription>
    Group
  • The operating system must implement DoD-approved encryption to protect the confidentiality of remote access sessions.

    &lt;VulnDiscussion&gt;Remote access is any access to an organizational information system by a user (or an information system) communicating throug...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • The operating system must use cryptographic mechanisms to protect and restrict access to information on portable digital media.

    &lt;VulnDiscussion&gt;When data is written to portable digital media, such as thumb drives, floppy diskettes, compact disks, and magnetic tape, etc...
    Rule Medium Severity
  • SRG-OS-000185

    <GroupDescription></GroupDescription>
    Group
  • The operating system must protect the confidentiality and integrity of information at rest.

    &lt;VulnDiscussion&gt;When data is written to digital media, such as hard drives, mobile computers, external/removable hard drives, personal digita...
    Rule Low Severity
  • SRG-OS-000216

    <GroupDescription></GroupDescription>
    Group
  • The operating system must use cryptographic mechanisms to protect the integrity of audit information.

    &lt;VulnDiscussion&gt;Protection of audit records and audit data is of critical importance. Cryptographic mechanisms are the industry established s...
    Rule Low Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • The sticky bit must be set on all world writable directories.

    &lt;VulnDiscussion&gt;Files in directories that have had the "sticky bit" enabled can only be deleted by users that have both write permissions for...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Permissions on user home directories must be 750 or less permissive.

    &lt;VulnDiscussion&gt;Group-writable or world-writable user home directories may enable malicious users to steal or modify other users' data or to ...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Permissions on user . (hidden) files must be 750 or less permissive.

    &lt;VulnDiscussion&gt;Group-writable or world-writable user configuration files may enable malicious users to steal or modify other users' data or ...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Permissions on user .netrc files must be 750 or less permissive.

    &lt;VulnDiscussion&gt;.netrc files may contain unencrypted passwords that can be used to attack other systems.&lt;/VulnDiscussion&gt;&lt;FalsePosit...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • There must be no user .rhosts files.

    &lt;VulnDiscussion&gt;Even though the .rhosts files are ineffective if support is disabled in /etc/pam.conf, they may have been brought over from o...
    Rule High Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Groups assigned to users must exist in the /etc/group file.

    &lt;VulnDiscussion&gt;Groups defined in passwd but not in group file pose a threat to system security since group permissions are not properly mana...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Users must have a valid home directory assignment.

    &lt;VulnDiscussion&gt;All users must be assigned a home directory in the passwd file. Failure to have a home directory may result in the user being...
    Rule Low Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • All user accounts must be configured to use a home directory that exists.

    &lt;VulnDiscussion&gt;If the user's home directory does not exist, the user will be placed in "/" and will not be able to write any files or have l...
    Rule Low Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • All home directories must be owned by the respective user assigned to it in /etc/passwd.

    &lt;VulnDiscussion&gt;Since the user is accountable for files stored in the user's home directory, the user must be the owner of the directory.&lt;...
    Rule Medium Severity
  • SRG-OS-000104

    <GroupDescription></GroupDescription>
    Group
  • Duplicate User IDs (UIDs) must not exist for users within the organization.

    &lt;VulnDiscussion&gt;Users within the organization must be assigned unique UIDs for accountability and to ensure appropriate access protections.&l...
    Rule Medium Severity
  • SRG-OS-000121

    <GroupDescription></GroupDescription>
    Group
  • Duplicate UIDs must not exist for multiple non-organizational users.

    &lt;VulnDiscussion&gt;Non-organizational users must be assigned unique UIDs for accountability and to ensure appropriate access protections.&lt;/Vu...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Duplicate Group IDs (GIDs) must not exist for multiple groups.

    &lt;VulnDiscussion&gt;User groups must be assigned unique GIDs for accountability and to ensure appropriate access protections.&lt;/VulnDiscussion&...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Reserved UIDs 0-99 must only be used by system accounts.

    &lt;VulnDiscussion&gt;If a user is assigned a UID that is in the reserved range, even if it is not presently in use, security exposures can arise i...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Duplicate user names must not exist.

    &lt;VulnDiscussion&gt;If a user is assigned a duplicate user name, it will create and have access to files with the first UID for that username in ...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • Duplicate group names must not exist.

    &lt;VulnDiscussion&gt;If a group is assigned a duplicate group name, it will create and have access to files with the first GID for that group in g...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • User .netrc files must not exist.

    &lt;VulnDiscussion&gt;The .netrc file presents a significant security risk since it stores passwords in unencrypted form.&lt;/VulnDiscussion&gt;&lt...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • The system must not allow users to configure .forward files.

    &lt;VulnDiscussion&gt;Use of the .forward file poses a security risk in that sensitive data may be inadvertently transferred outside the organizati...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • World-writable files must not exist.

    &lt;VulnDiscussion&gt;Data in world-writable files can be read, modified, and potentially compromised by any user on the system. World-writable fil...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • All valid SUID/SGID files must be documented.

    &lt;VulnDiscussion&gt;There are valid reasons for SUID/SGID programs, but it is important to identify and review such programs to ensure they are l...
    Rule Low Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • The operating system must have no unowned files.

    &lt;VulnDiscussion&gt;A new user who is assigned a deleted user's user ID or group ID may then end up owning these files, and thus have more access...
    Rule Medium Severity
  • SRG-OS-000480

    <GroupDescription></GroupDescription>
    Group
  • The operating system must have no files with extended attributes.

    &lt;VulnDiscussion&gt;Attackers or malicious users could hide information, exploits, etc. in extended attribute areas. Since extended attributes ar...
    Rule Low Severity

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