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IS3440 Linux Security Unit 2 Securing a Linux Platform―Core Components

IS3440 Linux Security Unit 2 Securing a Linux Platform―Core Components. Learning Objective. Configure the basic settings to secure a Linux platform. Key Concepts. Secure boot loaders Security considerations while using kernel and user space components

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IS3440 Linux Security Unit 2 Securing a Linux Platform―Core Components

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  1. IS3440 Linux Security Unit 2 Securing a Linux Platform―Core Components

  2. Learning Objective • Configure the basic settings to secure a Linux platform.

  3. Key Concepts • Secure boot loaders • Security considerations while using kernel and user space components • Discretionary access control (DAC) and access control lists (ACLs) • Mandatory access control (MAC) with Security Enhanced Linux (SELinux) • Concepts of a packet filtering firewall

  4. EXPLORE: CONCEPTS

  5. Common Boot Loaders • Grand Unified Bootloader (GRUB) • Linux Loader (LILO) • Loadlin • Universal Bootloader (U-Boot)

  6. GRUB Configuration Options

  7. The Linux Firewall Location of netfilter Location of iptables Kernel Space User Space Hardware User

  8. Layered Security • Physical security • Firewall • Access control mechanisms • Encryption • Monitoring • Backups

  9. EXPLORE: PROCESSES

  10. Common Linux Access Controls

  11. EXPLORE: ROLES

  12. Access Control Mechanisms DAC • Defines the access control for objects in the filesystem ACLs • Grants “special” permissions to users or groups for an object in the filesystem that are not specified in the DAC permissions MAC • Adds additional categories to objects in the filesystem

  13. EXPLORE: CONTEXTS

  14. Kernel Space • Kernel Space has access and can control all aspects of a Linux system. • Loadable kernel modules (LKMs) are a common avenue for rootkits.

  15. User Space • User space is the most likely avenue that black-hat hackers attempt to exploit the Linux system. • It is common for black-hat hackers to gain unauthorized access simply by guessing an easy password from a user account.

  16. EXPLORE: RATIONALE

  17. Importance of a Firewall Firewall on each host server provides an additional layer of security: • If the network perimeter firewall allows unauthorized traffic into the network, firewall protects servers from the unauthorized traffic. • Firewall provides additional protection to host servers if a rogue program infects the local area network (LAN).

  18. Importance of Securing Core Components • Default settings, improper file permissions, and insecure user accounts are common methods used by black-hat hackers to gain unauthorized access. • Best practices and compliance standards require basic security and can result in hefty fines, if not followed.

  19. Summary • In this presentation, the following concepts were covered: • Common boot loaders • The process of Linux access control • Access control mechanisms such as DAC, ACL, and MAC • Considerations for using kernel space and user space • Importance of firewall and securing core components

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