{"id":1961,"date":"2025-12-02T19:31:33","date_gmt":"2025-12-02T18:31:33","guid":{"rendered":"http:\/\/www.load.se\/hardening-aix\/"},"modified":"2026-05-31T21:33:13","modified_gmt":"2026-05-31T19:33:13","slug":"hardening-aix","status":"publish","type":"page","link":"https:\/\/www.load.se\/en\/hardening-aix\/","title":{"rendered":"Hardening AIX"},"content":{"rendered":"
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Hardening AIX<\/h1>\n<\/div><\/div>

The basic principles behind a more secure UNIX system<\/h3>\n

Hardening AIX is not about a single setting or a magic command. It is a holistic approach where the aim is to reduce the attack surface, strengthen access controls and ensure that the system behaves in a predictable and verifiable manner. IBM's guidelines for AIX 7.3 describe a number of core principles that all organizations should have in place \u2013 regardless of whether the environment is small or consists of hundreds of servers. <\/p>\n

Here is a summary of the most important concepts and principles.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

Read more in IBM's official guide for AIX 7.3 Security Hardening<\/h2>\n<\/div><\/div>
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\ue0e3<\/span><\/span><\/div>

AIX 7.3 Security Hardening<\/h4>

Would you like to delve into the details? IBM's own documentation goes through all the security features in AIX 7.3 \u2013 from policies and profiles to RBAC, network security and system integrity. Perfect for those who want to work in a structured way with hardening. <\/p>\n<\/div><\/div><\/div><\/div><\/div>

Reduce the attack surface<\/h1>\n<\/div><\/div>

The less the system exposes, the harder it becomes to attack.<\/p>\n

Key principles:<\/strong><\/p>\n

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    Uninstall or disable services you do not use.<\/p>\n<\/li>\n

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    Close ports and protocols that are not needed.<\/p>\n<\/li>\n

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    Restrict access to remote administration and logins.<\/p>\n<\/li>\n<\/ul>\n

    This is often the most effective and at the same time simplest form of hardening.<\/p>\n<\/div><\/div>

    Strengthen authentication and access control<\/h1>\n<\/div><\/div>

    AIX offers advanced mechanisms to control who can do what.<\/p>\n

    Important measures:<\/strong><\/p>\n

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    • \n

      Activate and configure RBAC (Role-Based Access Control)<\/strong>.<\/p>\n<\/li>\n

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      Implement minimal privileges<\/strong> \u2013 users should only have exactly what they need.<\/p>\n<\/li>\n

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      Use secure password policies and lockout rules.<\/p>\n<\/li>\n

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      Log and monitor all changes in permissions.<\/p>\n<\/li>\n<\/ul>\n

      RBAC is particularly powerful for avoiding overuse of root.<\/p>\n<\/div><\/div>

      Protect system files and file permissions<\/h1>\n<\/div><\/div>

      A large part of AIX security is about ensuring that files cannot be manipulated.<\/p>\n

      Basic steps:<\/strong><\/p>\n

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        Use trusted computing base (TCB)<\/strong> to verify the integrity of the system.<\/p>\n<\/li>\n

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        Run regular checks with tcbck<\/code>.<\/p>\n<\/li>\n

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        Secure directories such as \/etc<\/code>, \/usr<\/code> and sensitive binaries.<\/p>\n<\/li>\n<\/ul>\n

        TCB is a unique and strong mechanism that distinguishes AIX from many other UNIX variants.<\/p>\n<\/div><\/div>