Operating Systems & Virtualisation Security Knowledge Area
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Operating Systems and Virtualisation Security Knowledge Area (Draft for Comment)
OPERATING SYSTEMS AND VIRTUALISATION SECURITY KNOWLEDGE AREA (DRAFT FOR COMMENT) AUTHOR: Herbert Bos – Vrije Universiteit Amsterdam EDITOR: Andrew Martin – Oxford University REVIEWERS: Chris Dalton – Hewlett Packard David Lie – University of Toronto Gernot Heiser – University of New South Wales Mathias Payer – École Polytechnique Fédérale de Lausanne © Crown Copyright, The National Cyber Security Centre 2019. Following wide community consultation with both academia and industry, 19 Knowledge Areas (KAs) have been identified to form the scope of the CyBOK (see diagram below). The Scope document provides an overview of these top-level KAs and the sub-topics that should be covered under each and can be found on the project website: https://www.cybok.org/. We are seeking comments within the scope of the individual KA; readers should note that important related subjects such as risk or human factors have their own knowledge areas. It should be noted that a fully-collated CyBOK document which includes issue 1.0 of all 19 Knowledge Areas is anticipated to be released by the end of July 2019. This will likely include updated page layout and formatting of the individual Knowledge Areas. Operating Systems and Virtualisation Security Herbert Bos Vrije Universiteit Amsterdam April 2019 INTRODUCTION In this knowledge area, we introduce the principles, primitives and practices for ensuring security at the operating system and hypervisor levels. We shall see that the challenges related to operating system security have evolved over the past few decades, even if the principles have stayed mostly the same. For instance, when few people had their own computers and most computing was done on multiuser (often mainframe-based) computer systems with limited connectivity, security was mostly focused on isolating users or classes of users from each other1. -
A Solution to Php Code Injection Attacks and Web
INTERNATIONAL JOURNAL OF RESEARCH IN COMPUTER APPLICATIONS AND ROBOTICS Vol.2 Issue.9, Pg.: 24-31 September 2014 www.ijrcar.com INTERNATIONAL JOURNAL OF RESEARCH IN COMPUTER APPLICATIONS AND ROBOTICS ISSN 2320-7345 A SOLUTION TO PHP CODE INJECTION ATTACKS AND WEB VULNERABILITIES Venkatesh Yerram1, Dr G.Venkat Rami Reddy2 ¹Computer Networks and Information Security, [email protected] ²Computer Science Engineering, 2nd [email protected] JNTU Hyderabad, India Abstract Over the decade web applications are grown rapidly. This leads to cyber crimes. Attacker injects various scripts to malfunction the web application. Attacker injects these scripts to text box of vulnerable web application from various compounds such as search bar, feedback form, login form etc and later which is executed by the server. Sometimes attacker modifies the URL to execute a successful attack. This execution of system calls and API on web server by attacker can damage the file system and or leaks information of web server. PHP is a server side scripting language, dynamic features and functionalities are controlled through the PHP language. Hence, the use of PHP language results in high possibility of successful execution of code injection attacks. The aim of this paper is first to understand the code web application vulnerability related to PHP code injection attack, the scenario has been developed. Secondly defeat the attack and fast incident determination from the developed domain dictionary. This proposed system is helpful for cyber forensics expert to gather and analyze the evidence effectively Keywords: Code Injection, vulnerabilities, Attack, cyber forensics 1. INTRODUCTION The web environment is growing rapidly day by day, the cyber crimes also increasing rapidly. -
Access Control
Security Engineering: A Guide to Building Dependable Distributed Systems CHAPTER 4 Access Control Going all the way back to early time-sharing systems, we systems people regarded the users, and any code they wrote, as the mortal enemies of us and each other. We were like the police force in a violent slum. —ROGER NEEDHAM Microsoft could have incorporated effective security measures as standard, but good sense prevailed. Security systems have a nasty habit of backfiring, and there is no doubt they would cause enormous problems. —RICK MAYBURY 4.1 Introduction Access control is the traditional center of gravity of computer security. It is where se- curity engineering meets computer science. Its function is to control which principals (persons, processes, machines, . .) have access to which resources in the sys- tem—which files they can read, which programs they can execute, how they share data with other principals, and so on. NOTE This chapter necessarily assumes more computer science background than previous chapters, but I try to keep it to a minimum. 51 Chapter 4: Access Controls Figure 4.1 Access controls at different levels in a system. Access control works at a number of levels, as shown in Figure 4.1, and described in the following: 1. The access control mechanisms, which the user sees at the application level, may express a very rich and complex security policy. A modern online busi- ness could assign staff to one of dozens of different roles, each of which could initiate some subset of several hundred possible transactions in the system. Some of these (such as credit card transactions with customers) might require online authorization from a third party while others (such as refunds) might require dual control. -
Malware Information
Malware Information Source: www.onguardonline.gov Malware Quick Facts Malware, short for "malicious software," includes viruses and spyware to steal personal information, send spam, and commit fraud. Criminals create appealing websites, desirable downloads, and compelling stories to lure you to links that will download malware – especially on computers that don't use adequate security software. But you can minimize the havoc that malware can wreak and reclaim your computer and electronic information. If you suspect malware is on your computer: • Stop shopping, banking, and other online activities that involve user names, passwords, or other sensitive information. • Confirm that your security software is active and current. At a minimum, your computer should have anti-virus and anti-spyware software, and a firewall. • Once your security software is up-to-date, run it to scan your computer for viruses and spyware, deleting anything the program identifies as a problem. • If you suspect your computer is still infected, you may want to run a second anti-virus or anti-spyware program – or call in professional help. • Once your computer is back up and running, think about how malware could have been downloaded to your machine, and what you could do to avoid it in the future. Malware is short for "malicious software;" it includes viruses – programs that copy themselves without your permission – and spyware, programs installed without your consent to monitor or control your computer activity. Criminals are hard at work thinking up creative ways to get malware on your computer. They create appealing web sites, desirable downloads, and compelling stories to lure you to links that will download malware, especially on computers that don't use adequate security software. -
Role Based Access Control on MLS Systems Without Kernel Changes
Role Based Access Control on For example, roles in a bank may include the role of teller or accountant. Each of these roles has a set of MLS Systems without Kernel privileges or transactions that they can p erform, includ- Changes ing some privileges that are available to b oth roles. Roles can b e hierarchical. For example, some roles in a hospital D. Richard Kuhn may b e health care provider, nurse, and do ctor. The do c- National Institute of Standards and Technology tor role may include all privileges available to the nurse Gaithersburg, Maryland 20899 role, which in turn includes all the privileges available to the health care provider role. Roles have b een used in a variety of forms for com- Abstract puter system security for at least 20 years, and several prop osals for incorp orating roles into existing access con- Role based access control (RBAC) is attracting increas- trol mechanisms have b een published [2], [3], [4]. More ing attention as a security mechanism for b oth commer- recently, formal defnitions for general-purp ose RBAC no- cial and many military systems. This pap er shows how tions have b een prop osed [5], [6], [7]. RBAC can b e implemented using the mechanisms avail- This pap er shows how RBAC can b e implemented able on traditional multi-level security systems that im- using the controls available on traditional lattice-based plement information fow p olicies. The construction from multi-level secure systems. This approach presents a MLS to RBAC systems is signifcant b ecause it shows that number of advantages: the enormous investment in MLS systems can b e lever- aged to pro duce RBAC systems. -
Using Certificate-Based Authentication for Access Control
GLOBALSIGN WHITE PAPER Using Certificate‐based Authentication for Access Control GLOBALSIGN WHITE PAPER John Harris for GlobalSign GLOBALSIGN WHITE PAPER CONTENTS Introduction ...................................................................................................................................................................2 Finding The Right Path ...................................................................................................................................................2 Certicate‐based Network Authentication ......................................................................................................................3 What Is It? ................................................................................................................................................................. 3 How Does It All Work? .............................................................................................................................................. 4 What Can Users Expect? ........................................................................................................................................... 4 How Does It Stack Up To Other Authentication Methods? ....................................................................................... 4 Other Authentication Methods ................................................................................................................................. 5 Comparing Authentication Methods ........................................................................................................................ -
Quantifying Security Impact of Operating-System Design
Copyright Notice School of Computer Science & Engineering COMP9242 Advanced Operating Systems These slides are distributed under the Creative Commons Attribution 3.0 License • You are free: • to share—to copy, distribute and transmit the work • to remix—to adapt the work • under the following conditions: 2019 T2 Week 09b • Attribution: You must attribute the work (but not in any way that Local OS Research suggests that the author endorses you or your use of the work) as @GernotHeiser follows: “Courtesy of Gernot Heiser, UNSW Sydney” The complete license text can be found at http://creativecommons.org/licenses/by/3.0/legalcode 1 COMP9242 2019T2 W09b: Local OS Research © Gernot Heiser 2019 – CC Attribution License Quantifying OS-Design Security Impact Approach: • Examine all critical Linux CVEs (vulnerabilities & exploits database) • easy to exploit 115 critical • high impact Linux CVEs Quantifying Security Impact of • no defence available to Nov’17 • confirmed Operating-System Design • For each establish how microkernel-based design would change impact 2 COMP9242 2019T2 W09b: Local OS Research © Gernot Heiser 2019 – CC Attribution License 3 COMP9242 2019T2 W09b: Local OS Research © Gernot Heiser 2019 – CC Attribution License Hypothetical seL4-based OS Hypothetical Security-Critical App Functionality OS structured in isolated components, minimal comparable Trusted inter-component dependencies, least privilege to Linux Application computing App requires: base • IP networking Operating system Operating system • File storage xyz xyz • Display -
CHERI Instruction-Set Architecture
UCAM-CL-TR-876 Technical Report ISSN 1476-2986 Number 876 Computer Laboratory Capability Hardware Enhanced RISC Instructions: CHERI Instruction-Set Architecture Robert N. M. Watson, Peter G. Neumann, Jonathan Woodruff, Michael Roe, Jonathan Anderson, David Chisnall, Brooks Davis, Alexandre Joannou, Ben Laurie, Simon W. Moore, Steven J. Murdoch, Robert Norton, Stacey Son September 2015 15 JJ Thomson Avenue Cambridge CB3 0FD United Kingdom phone +44 1223 763500 http://www.cl.cam.ac.uk/ c 2015 Robert N. M. Watson, Peter G. Neumann, Jonathan Woodruff, Michael Roe, Jonathan Anderson, David Chisnall, Brooks Davis, Alexandre Joannou, Ben Laurie, Simon W. Moore, Steven J. Murdoch, Robert Norton, Stacey Son, SRI International Approved for public release; distribution is unlimited. Sponsored by the Defense Advanced Research Projects Agency (DARPA) and the Air Force Research Laboratory (AFRL), under contracts FA8750-10-C-0237 (“CTSRD”) and FA8750-11-C-0249 (“MRC2”) as part of the DARPA CRASH and DARPA MRC research programs. The views, opinions, and/or findings contained in this report are those of the authors and should not be interpreted as representing the official views or policies, either expressed or implied, of the Department of Defense or the U.S. Government. Additional support was received from St John’s College Cambridge, the SOAAP Google Focused Research Award, the RCUK’s Horizon Digital Economy Research Hub Grant (EP/G065802/1), the EPSRC REMS Programme Grant (EP/K008528/1), the Isaac Newton Trust, the UK Higher Education Innovation Fund (HEIF), and Thales E-Security. Technical reports published by the University of Cambridge Computer Laboratory are freely available via the Internet: http://www.cl.cam.ac.uk/techreports/ ISSN 1476-2986 Abstract This technical report describes CHERI ISAv4, the fourth version of the Capability Hardware Enhanced RISC Instructions (CHERI) Instruction-Set Architecture (ISA)1 being developed by SRI International and the University of Cambridge. -
Host-Based Code Injection Attacks: a Popular Technique Used by Malware
Host-Based Code Injection Attacks: A Popular Technique Used By Malware Thomas Barabosch Elmar Gerhards-Padilla Fraunhofer FKIE Fraunhofer FKIE Friedrich-Ebert-Allee 144 Friedrich-Ebert-Allee 144 53113 Bonn, Germany 53113 Bonn, Germany [email protected] [email protected] c 2014 IEEE. Personal use of this material is per- implemented with different goals in mind, they share one mitted. Permission from IEEE must be obtained for all common feature: they all inject code locally into foreign other uses, in any current or future media, including process spaces. One reason for this behaviour is detection reprinting/republishing this material for advertising or avoidance. However, code injections are not limited to tar- promotional purposes, creating new collective works, for geted malware. Mass-malware also uses code injections in resale or redistribution to servers or lists, or reuse of any order to stay under the radar (ZeroAccess, ZeusP2P or Con- copyrighted component of this work in other works. ficker). Detection avoidance is not the only advantage of us- ing code injections from a malware author’s point of view. Abstract Further reasons for using code injections are interception of critical information, privilege escalation or manipulation of Common goals of malware authors are detection avoid- security products. ance and gathering of critical information. There exist The above mentioned examples are all malware fami- numerous techniques that help these actors to reach their lies for Microsoft Windows. However, code injections are goals. One especially popular technique is the Host-Based platform-independent. In fact all established multitasking Code Injection Attack (HBCIA). -
Oral History of Fernando Corbató
Oral History of Fernando Corbató Interviewed by: Steven Webber Recorded: February 1, 2006 West Newton, Massachusetts CHM Reference number: X3438.2006 © 2006 Computer History Museum Oral History of Fernando Corbató Steven Webber: Today the Computer History Museum Oral History Project is going to interview Fernando J. Corbató, known as Corby. Today is February 1 in 2006. We like to start at the very beginning on these interviews. Can you tell us something about your birth, your early days, where you were born, your parents, your family? Fernando Corbató: Okay. That’s going back a long ways of course. I was born in Oakland. My parents were graduate students at Berkeley and then about age 5 we moved down to West Los Angeles, Westwood, where I grew up [and spent] most of my early years. My father was a professor of Spanish literature at UCLA. I went to public schools there in West Los Angeles, [namely,] grammar school, junior high and [the high school called] University High. So I had a straightforward public school education. I guess the most significant thing to get to is that World War II began when I was in high school and that caused several things to happen. I’m meandering here. There’s a little bit of a long story. Because of the wartime pressures on manpower, the high school went into early and late classes and I cleverly saw that I could get a chance to accelerate my progress. I ended up taking both early and late classes and graduating in two years instead of three and [thereby] got a chance to go to UCLA in 1943. -
Topic a Dataflow Model of Computation
Department of Electrical and Computer Engineering Computer Architecture and Parallel Systems Laboratory - CAPSL Topic A Dataflow Model of Computation CPEG 852 - Spring 2014 Advanced Topics in Computing Systems Guang R. Gao ACM Fellow and IEEE Fellow Endowed Distinguished Professor Electrical & Computer Engineering University of Delaware CPEG852-Spring14: Topic A - Dataflow - 1 [email protected] Outline • Parallel Program Execution Models • Dataflow Models of Computation • Dataflow Graphs and Properties • Three Dataflow Models – Static – Recursive Program Graph – Dynamic • Dataflow Architectures CPEG852-Spring14: Topic A - Dataflow - 1 2 Terminology Clarification • Parallel Model of Computation – Parallel Models for Algorithm Designers – Parallel Models for System Designers • Parallel Programming Models • Parallel Execution Models • Parallel Architecture Models CPEG852-Spring14: Topic A - Dataflow - 1 3 What is a Program Execution Model? . Application Code . Software Packages User Code . Program Libraries . Compilers . Utility Applications PXM (API) . Hardware System . Runtime Code . Operating System CPEG852-Spring14: Topic A - Dataflow - 1 4 Features a User Program Depends On . Procedures; call/return Features expressed within .Access to parameters and a Programming language variables .Use of data structures (static and dynamic) But that’s not all !! . File creation, naming and access Features expressed Outside .Object directories a (typical) programming .Communication: networks language and peripherals .Concurrency: coordination; scheduling CPEG852-Spring14: Topic A - Dataflow - 1 5 Developments in the 1960s, 1970s Highlights 1960 Other Events . Burroughs B5000 Project . Project MAC Funded at MIT Started . Rice University Computer . IBM announces System 360 . Vienna Definition Method . Tasking introduced in Algol . Common Base Language, 1970 68 and PL/I Dennis . Burroughs builds Robert . Contour Model, Johnston Barton’s DDM1 . Book on the B6700, . -
The OKL4 Microvisor: Convergence Point of Microkernels and Hypervisors
The OKL4 Microvisor: Convergence Point of Microkernels and Hypervisors Gernot Heiser, Ben Leslie Open Kernel Labs and NICTA and UNSW Sydney, Australia ok-labs.com ©2010 Open Kernel Labs and NICTA. All rights reserved. Microkernels vs Hypervisors > Hypervisors = “microkernels done right?” [Hand et al, HotOS ‘05] • Talks about “liability inversion”, “IPC irrelevance” … > What’s the difference anyway? ok-labs.com ©2010 Open Kernel Labs and NICTA. All rights reserved. 2 What are Hypervisors? > Hypervisor = “virtual machine monitor” • Designed to multiplex multiple virtual machines on single physical machine VM1 VM2 Apps Apps AppsApps AppsApps OS OS Hypervisor > Invented in ‘60s to time-share with single-user OSes > Re-discovered in ‘00s to work around broken OS resource management ok-labs.com ©2010 Open Kernel Labs and NICTA. All rights reserved. 3 What are Microkernels? > Designed to minimise kernel code • Remove policy, services, retain mechanisms • Run OS services in user-mode • Software-engineering and dependability reasons • L4: ≈ 10 kLOC, Xen ≈ 100 kLOC, Linux: ≈ 10,000 kLOC ServersServers ServersServers Apps Servers Device AppsApps Drivers Microkernel > IPC performance critical (highly optimised) • Achieved by API simplicity, cache-friendly implementation > Invented 1970 [Brinch Hansen], popularised late ‘80s (Mach, Chorus) ok-labs.com ©2010 Open Kernel Labs and NICTA. All rights reserved. 4 What’s the Difference? > Both contain all code executing at highest privilege level • Although hypervisor may contain user-mode code as well > Both need to abstract hardware resources • Hypervisor: abstraction closely models hardware • Microkernel: abstraction designed to support wide range of systems > What must be abstracted? • Memory • CPU • I/O • Communication ok-labs.com ©2010 Open Kernel Labs and NICTA.