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Security: AppArmor and SELinux, Linux Security Features and Zero Trust Security Model

Submitted by Roy Schestowitz on Tuesday 22nd of September 2020 10:03:23 AM Filed under
Security
  • Technologies for container isolation: A comparison of AppArmor and SELinux

    I researched how containers, virtual machines (VMs), and processes, in general, are separated by different technologies—namely, AppArmor and SELinux. My goal was to compare these solutions for isolation/separation capabilities in the cloud world.

    Just as a reminder, Red Hat Enterprise Linux uses SELinux technology to separate processes, containers, and VMs. OpenShift also uses this technology.

    The first option is an isolation technology called AppArmor, which is a very similar technology to SELinux. However, it is not label-based. AppArmor security profiles, which are equivalent to SELinux security policies, look more user-friendly, but that’s because AppArmor is less complicated and controls fewer operations.

  • Kees Cook: security things in Linux v5.7

    Linux v5.7 was released at the end of May.

    [...]

    After Silvio Cesare observed some weaknesses in the implementation of CONFIG_SLAB_FREELIST_HARDENED‘s freelist pointer content obfuscation, I improved their bit diffusion, which makes attacks require significantly more memory content exposures to defeat the obfuscation. As part of the conversation, Vitaly Nikolenko pointed out that the freelist pointer’s location made it relatively easy to target too (for either disclosures or overwrites), so I moved it away from the edge of the slab, making it harder to reach through small-sized overflows (which usually target the freelist pointer). As it turns out, there were a few assumptions in the kernel about the location of the freelist pointer, which had to also get cleaned up.

  • Zero Trust Security Model

    The Zero Trust Network, also called Zero Trust Architecture, is a model that was developed in 2010 by the principal analyst John Kindervag. A zero-trust security system helps to protect the enterprise system and improves cybersecurity.

    [...]

    The Zero Trust approach depends upon modern technologies and methods to achieve the target of securing an organization.

    The Zero Trust Model calls for businesses to manipulate micro-segmentation and granular perimeter execution based on users, their whereabouts, and other data or information, to find out whether to believe a user, machine, or application that is trying to seek access to a specific part of the enterprise or organization.

    Zero Trust also takes care of all other policies, for example, giving users the least access they require to complete the task they want to complete. Creating a Zero Trust environment is not only about putting into practice the separate singular technology associations; it is also about using these and other technologies to impose the idea that no one and nothing should have access until they have proven that they should be trusted.

    Of course, organizations know that creating a Zero Trust Security Model is not an overnight achievement. Because it is not easy to achieve something so complex in a single night, it can take years to find the most secure, ideal system possible.

    Many companies are shifting to the cloud security system. These systems have the best options to go to Zero Trust. Now is the time to be ready for a Zero Trust transition. All organizations, either large or small, or should have Zero Trust security systems for their data safety.

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