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Computer Security: Principles and Practice Chapter 12 – Operating Systems by William Stallings and Lawrie Brown Lecture slides by Lawrie Brown, OS Security Layers • each layer is vulnerable to attack from below if the lower layers are not secured appropriately, OS Hardening Measures • the 2010 Australian Defense Signals Directorate (DSD) list the “Top 35 Mitigation Strategies” • over 70% of the targeted cyber intrusions investigated by DSD in 2009 could have been prevented the top four measures • the top four measures for prevention are: • patch operating systems and applications using auto-update • patch third-party applications • restrict admin privileges to users who need them • white-list approved applications DSD list similar to NSA top 20, Operating System Security • possible for a system to be compromised during the installation process before it can install the latest patches • building and deploying a system should be a planned process designed to counter this threat • process must: • assess risks and plan the system deployment • secure the underlying operating system and then the key applications • ensure any critical content is secured • ensure appropriate network protection mechanisms are used • ensure appropriate processes are used to maintain security, Operating Systems Hardening • first critical step in securing a system is to secure the base operating system • basic steps • install and patch the operating system • harden and configure the operating system to adequately address the identified security needs of the system • install and configure additional security controls, such as anti-virus, host-based firewalls, and intrusion detection system (IDS) • test the security of the basic operating system to ensure that the steps taken adequately address its security needs, Initial Setup and Patching • system security begins with the installation of the operating system • initial installation should install the minimum necessary for the desired system • full installation and hardening process should occur before the system is deployed to its intended location • overall boot process must also be secured • the integrity and source of any additional device driver code must be carefully validated • should stage and validate all patches on the test systems before deploying them in production, Remove Unnecessary Services (& Apps) • if fewer software packages are available to run the risk is reduced • system planning process should identify what is actually required for a given system • when performing the initial installation the supplied defaults should not be used • default configuration is set to maximize ease of use and functionality rather than security • if additional packages are needed later they can be installed when they are required, Configure Users and Privileges • not all users with access to a system will have the same access to all data and resources on that system • elevated privileges should be restricted to only those users that require them, and then only when they are needed to perform a task • system planning process should consider: • categories of users on the system • privileges they have • types of information they can access • how and where they are defined and authenticated, Additional Security Controls • many of the security hardening guides provide lists of recommended changes to the default access configuration • further security possible by installing and configuring additional security tools: • anti-virus software • host-based firewalls • IDS or IPS software • application white-listing, System Testing • final step in the process of initially securing the base operating system is security testing • goal: ensure the previous security configuration steps are correctly implemented and identify any possible vulnerabilities • checklists are included in security hardening guides • there are programs specifically designed to: • review a system to ensure that a system meets the basic security requirements • scan for known vulnerabilities and poor configuration practices • should be done following the initial hardening of the system • repeated periodically as part of the security maintenance process, Application Security • default storage directories, sizes, and access • some applications or services may include: • default data • scripts • user accounts • of particular concern with remotely accessed services such as Web and file transfer services • risk from this form of attack is reduced by ensuring that most of the files can only be read, but not written, by the server • encryption technology: for file storage and data transmission (HTTPS, SSH, SSL), Security Maintenance • process of maintaining security is continuous • security maintenance includes: • monitoring and analyzing logging information • performing regular backups • recovering from security compromises • regularly testing system security • using appropriate software maintenance processes to patch and update all critical software, and to monitor and revise configuration as needed, Logging • quickly and accurately identify what happened • help with restore and recovery • key: capture the correct log (data, time, user, event, activity) • automated tools necessary, Data Backup and Archive • archive: the process of retaining copies of data over extended periods of time in order to meet legal and operational requirements to access past data • backup: the process of making copies of data at regular intervals • performing regular backups of data is a critical control that assists with maintaining the integrity of the system and user data • may be legal or operational requirements for the retention of data • needs and policy relating to backup and archive should be determined during the system planning stage • offline or online • stored locally or transported to a remote site, Linux/Unix Security: Patch/Configs • patch management • keeping security patches up to date is a widely recognized and critical control for maintaining security • application and service configuration • most commonly implemented using separate text files for each application and service • generally located either in the /etcdirectory or in the installation tree for a specific application • individual user configurations that can override the system defaults are located in hidden “dot” files in each user’s home directory • most important changes needed to improve system security are to disable services and applications that are not required, Linux/Unix Security: Users • users, groups, and permissions • access is specified as granting read, write, and execute permissions to each of owner, group, and others for each resource • guides recommend changing the access permissions for critical directories and files • chmod to modify privileges, Linux/Unix Security • chrootjail • restricts the server’s view of the file system to just a specified portion • an application: FTP • uses chroot system call to confine a process by mapping the root of the filesystem to some other directory • file directories outside the chroot jail aren’t visible or reachable • main disadvantage is added complexity, Windows Security • Microsoft Security Essentials • essential that anti-virus, anti-spyware, personal firewall, and other malware and attack detection and handling software packages are installed and configured • important to ensure the set of products in use are compatible • Windows systems also support a range of cryptographic functions: • encrypting files and directories using the Encrypting File System (EFS) • full-disk encryption with AES using BitLocker • “Microsoft Baseline Security Analyzer” • free, easy to use tool that checks for compliance with Microsoft’s security recommendations, Virtualization • a technology that provides an abstraction of the resources used by some software which runs in a simulated environment called a virtual machine (VM) • benefits include better efficiency in the use of the physical system resources • provides support for multiple distinct operating systems and associated applications on one physical system • raises additional security concerns, Virtualization Security Issues • security concerns include: • guest OS isolation • ensuring that programs executing within a guest OS may only access and use the resources allocated to it • guest OS monitoring by the hypervisor • which has privileged access to the programs and data in each guest OS • virtualized environment security • particularly image and snapshot management which attackers may attempt to view or modify, Summary • system security planning • operating systems hardening • initial setup and patching • remove unnecessary services • configure users and groups • test system security • application security • application configuration • encryption technology • security maintenance • data backup • virtualization security • virtualization alternatives • Linux/Unix security • patch management • application configuration • users, groups, permissions • remote access • security testing • windows security • patch management • users administration and access controls • application and service configuration • security testing, © 2021 SlideServe | Powered By DigitalOfficePro, Computer Security: Principles and Practice, - - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -. 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