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I - Mission Critical Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-OS-000002-GPOS-00002

    <GroupDescription></GroupDescription>
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  • AIX must automatically remove or disable temporary user accounts after 72 hours or sooner.

    &lt;VulnDiscussion&gt;If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be used to gain...
    Rule Medium Severity
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  • SRG-OS-000021-GPOS-00005

    <GroupDescription></GroupDescription>
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  • AIX must enforce the limit of three consecutive invalid login attempts by a user before the user account is locked and released by an administrator.

    &lt;VulnDiscussion&gt;By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise...
    Rule Medium Severity
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  • SRG-OS-000027-GPOS-00008

    <GroupDescription></GroupDescription>
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  • AIX must limit the number of concurrent sessions to 10 for all accounts and/or account types.

    &lt;VulnDiscussion&gt;Operating system management includes the ability to control the number of users and user sessions that utilize an operating s...
    Rule Medium Severity
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  • SRG-OS-000066-GPOS-00034

    <GroupDescription></GroupDescription>
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  • If the AIX system is using LDAP for authentication or account information, the LDAP SSL, or TLS connection must require the server provide a certificate and this certificate must have a valid path to a trusted CA.

    &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
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  • SRG-OS-000073-GPOS-00041

    <GroupDescription></GroupDescription>
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  • If AIX is using LDAP for authentication or account information, the /etc/ldap.conf file (or equivalent) must not contain passwords.

    &lt;VulnDiscussion&gt;Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are...
    Rule High Severity
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  • SRG-OS-000104-GPOS-00051

    <GroupDescription></GroupDescription>
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  • All accounts on AIX system must have unique account names.

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule High Severity
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  • SRG-OS-000104-GPOS-00051

    <GroupDescription></GroupDescription>
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  • All accounts on AIX must be assigned unique User Identification Numbers (UIDs) and must authenticate organizational and non-organizational users (or processes acting on behalf of these users).

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule High Severity
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  • SRG-OS-000104-GPOS-00051

    <GroupDescription></GroupDescription>
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  • The AIX SYSTEM attribute must not be set to NONE for any account.

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule High Severity
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  • SRG-OS-000109-GPOS-00056

    <GroupDescription></GroupDescription>
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  • Direct logins to the AIX system must not be permitted to shared accounts, default accounts, application accounts, and utility accounts.

    &lt;VulnDiscussion&gt;Shared accounts (accounts where two or more people log in with the same user identification) do not provide identification an...
    Rule Medium Severity
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  • SRG-OS-000112-GPOS-00057

    <GroupDescription></GroupDescription>
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  • AIX must use the SSH server to implement replay-resistant authentication mechanisms for network access to privileged and non-privileged accounts.

    &lt;VulnDiscussion&gt;A replay attack may enable an unauthorized user to gain access to the operating system. Authentication sessions between the a...
    Rule High Severity
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  • SRG-OS-000123-GPOS-00064

    <GroupDescription></GroupDescription>
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  • The AIX system must automatically remove or disable emergency accounts after the crisis is resolved or 72 hours.

    &lt;VulnDiscussion&gt;Emergency accounts are privileged accounts that are established in response to crisis situations where the need for rapid acc...
    Rule Medium Severity
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  • SRG-OS-000001-GPOS-00001

    <GroupDescription></GroupDescription>
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  • The shipped /etc/security/mkuser.sys file on AIX must not be customized directly.

    &lt;VulnDiscussion&gt;The "/etc/security/mkuser.sys" script customizes the new user account when a new user is created, or a user is logging into t...
    Rule Medium Severity
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  • SRG-OS-000001-GPOS-00001

    <GroupDescription></GroupDescription>
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  • The regular users default primary group must be staff (or equivalent) on AIX.

    &lt;VulnDiscussion&gt;The /usr/lib/security/mkuser.default file contains the default primary groups for regular and admin users. Setting a system g...
    Rule Medium Severity
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  • SRG-OS-000259-GPOS-00100

    <GroupDescription></GroupDescription>
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  • All system files, programs, and directories must be owned by a system account.

    &lt;VulnDiscussion&gt;Restricting permissions will protect the files from unauthorized modification.&lt;/VulnDiscussion&gt;&lt;FalsePositives&gt;&l...
    Rule Medium Severity
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  • SRG-OS-000259-GPOS-00100

    <GroupDescription></GroupDescription>
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  • AIX device files and directories must only be writable by users with a system account or as configured by the vendor.

    &lt;VulnDiscussion&gt;System device files in writable directories could be modified, removed, or used by an unprivileged user to control system har...
    Rule Medium Severity
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  • SRG-OS-000114-GPOS-00059

    <GroupDescription></GroupDescription>
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  • AIX must configure the ttys value for all interactive users.

    &lt;VulnDiscussion&gt;A user's "ttys" attribute controls from which device(s) the user can authenticate and log in. If the "ttys" attribute is not ...
    Rule Medium Severity
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  • SRG-OS-000028-GPOS-00009

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  • AIX must provide the lock command to let users retain their session lock until users are reauthenticated.

    &lt;VulnDiscussion&gt;All systems are vulnerable if terminals are left logged in and unattended. Leaving system terminals unsecure poses a potentia...
    Rule Medium Severity
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  • SRG-OS-000028-GPOS-00009

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  • AIX must provide xlock command in the CDE environment to let users retain their sessions lock until users are reauthenticated.

    &lt;VulnDiscussion&gt;All systems are vulnerable if terminals are left logged in and unattended. Leaving system terminals unsecure poses a potentia...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • AIX system must prevent the root account from directly logging in except from the system console.

    &lt;VulnDiscussion&gt;Limiting the root account direct logins to only system consoles protects the root account from direct unauthorized access fro...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • All AIX public directories must be owned by root or an application account.

    &lt;VulnDiscussion&gt;If a public directory has the sticky bit set and is not owned by a privileged UID, unauthorized users may be able to modify f...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • AIX administrative accounts must not run a web browser, except as needed for local service administration.

    &lt;VulnDiscussion&gt;If a web browser flaw is exploited while running as a privileged user, the entire system could be compromised. Specific exc...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • AIX default system accounts (with the exception of root) must not be listed in the cron.allow file or must be included in the cron.deny file, if cron.allow does not exist.

    &lt;VulnDiscussion&gt;To centralize the management of privileged account crontabs, of the default system accounts, only root may have a crontab.&lt...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The AIX root account must not have world-writable directories in its executable search path.

    &lt;VulnDiscussion&gt;If the root search path contains a world-writable directory, malicious software could be placed in the path by intruders and/...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Group Identifiers (GIDs) reserved for AIX system accounts must not be assigned to non-system accounts as their primary group GID.

    &lt;VulnDiscussion&gt;Reserved GIDs are typically used by system software packages. If non-system groups have GIDs in this range, they may conflict...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • UIDs reserved for system accounts must not be assigned to non-system accounts on AIX systems.

    &lt;VulnDiscussion&gt;Reserved UIDs are typically used by system software packages. If non-system accounts have UIDs in this range, they may confli...
    Rule Medium Severity
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