Preventing Privilege Escalation
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Least Privilege and Privilege Separation
CSE 127: Computer Security Least privilege and privilege separation Deian Stefan Slides adopted from John Mitchell, Dan Boneh, and Stefan Savage This week… • How to build secure systems ➤ Least privilege and privilege separation ➤ Sandboxing and isolation • Key is underlying principles not mechanisms ➤ We’re going to look at systems techniques ➤ Other ways to achieve similar goals: language-based Principles of secure design • Principle of least privilege • Privilege separation • Defense in depth ➤ Use more than one security mechanism ➤ Fail securely/closed • Keep it simple Principles of secure design • Principle of least privilege • Privilege separation • Defense in depth ➤ Use more than one security mechanism ➤ Fail securely/closed • Keep it simple Principle of Least Privilege Defn: A system should only have the minimal privileges needed for its intended purposes • What’s a privilege? ➤ Ability to access (e.g., read or write) a resource Principle of Least Privilege Defn: A system should only have the minimal privileges needed for its intended purposes • What’s a privilege? ➤ Ability to access (e.g., read or write) a resource Principle of Least Privilege Defn: A system should only have the minimal privileges needed for its intended purposes • What’s a privilege? ➤ Ability to access (e.g., read or write) a resource What’s the problem with this defn? • Talking about a huge, monolith system is not really useful • Why? Network Network User input User device File system File system Breaking a system into components • Compartmentalization and isolation ➤ Separate the system into isolated compartments ➤ Limit interaction between compartments • Why is this more meaningful? Network Network User input User device File system File system How dow we break things apart? Map compartment to user ids! • Recall: permissions in UNIX granted according to UID ➤ A process may access files, network sockets, …. -
New Concept of the Android Keystore Service with Regard to Security and Portability
University of Bremen Department of Mathematics and Computer Science New concept of the Android keystore service with regard to security and portability. Master’s Thesis by Fritjof Bornebusch reviewed by Dr. Karsten Sohr Prof. Dr. Jan Peleska supervised by Dipl. Inf. Florian Junge 2016 Confirmation I hereby confirm that I wrote this master thesis on my own and that I have used only the indicated references, resources, and aids. In German: Hiermit bestätige ich, dass ich die vorliegende Masterthesis selbstständig verfasst, und keine anderen als die angegebenen Quellen und Hilfsmittel verwendet habe. Bremen, 1/13/2016 Fritjof Bornebusch “Any fool can write code that a computer can understand. Good programmers write code that humans can understand.” – Martin Fowler – Bornebusch, Fritjof New concept of the Android keystore service with regard to security and portability. Master’s thesis, Department 3 - Mathematics / Computer Science University of Bremen, 2015 This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0). To view a copy of this license, send an email to [email protected], visit http://creativecommons.org/licenses/by-nc-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, California, 94042, USA. Table of Contents Acknowledgements 7 List of Figures 9 List of Listings 10 Acronyms 13 Glossary 15 1 Introduction 19 2 Background 24 2.1 Android System Architecture . 24 2.1.1 Security-Enhanced Linux . 28 2.1.2 Capabilities . 31 2.2 Memory Vulnerabilities . 32 2.2.1 Buffer Overflow Protection . 33 2.2.2 Dead Store Elimination . -
Integration of Security Measures and Techniques in an Operating System (Considering Openbsd As an Example)
Motivation Security Solutions and Techniques Summary Integration of Security Measures and Techniques in an Operating System (considering OpenBSD as an example) Igor Boehm Institute for Information Processing and Microprocessor Technology Johannes Kepler University Linz, Austria Igor Boehm Integration of Security Measures and Techniques in an OS Motivation Security Solutions and Techniques Summary Outline 1 Motivation The Basic Problem Being Studied Preliminary Solution Ideas and Goals 2 Security Solutions and Techniques Secure Software Design Techniques Memory Protection Techniques Relevance of Random Numbers for Security Igor Boehm Integration of Security Measures and Techniques in an OS Motivation The Basic Problem Being Studied Security Solutions and Techniques Preliminary Solution Ideas and Goals Summary Outline 1 Motivation The Basic Problem Being Studied Preliminary Solution Ideas and Goals 2 Security Solutions and Techniques Secure Software Design Techniques Memory Protection Techniques Relevance of Random Numbers for Security Igor Boehm Integration of Security Measures and Techniques in an OS Motivation The Basic Problem Being Studied Security Solutions and Techniques Preliminary Solution Ideas and Goals Summary The Basic Problem Being Studied The Clever Attacker: . finds a bug . knows how to craft an exploit . the exploit grants the attacker an advantage . the exploit is likely to work on many systems because of the strict regularity of the system environment Is there a way to solve this problem? Igor Boehm Integration of Security -
Z/OS Openssh User's Guide
z/OS Version 2 Release 4 z/OS OpenSSH User's Guide IBM SC27-6806-40 Note Before using this information and the product it supports, read the information in “Notices” on page 503. This edition applies to Version 2 Release 4 of z/OS (5650-ZOS) and to all subsequent releases and modifications until otherwise indicated in new editions. Last updated: 2020-11-16 © Copyright International Business Machines Corporation 2015, 2019. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Figures................................................................................................................. ix Tables.................................................................................................................. xi About this document...........................................................................................xiii Who should use this document?............................................................................................................... xiii z/OS information........................................................................................................................................xiii Discussion list...................................................................................................................................... xiii How to send your comments to IBM......................................................................xv If you have a technical problem.................................................................................................................xv -
VULNERABLE by DESIGN: MITIGATING DESIGN FLAWS in HARDWARE and SOFTWARE Konoth, R.K
VU Research Portal VULNERABLE BY DESIGN: MITIGATING DESIGN FLAWS IN HARDWARE AND SOFTWARE Konoth, R.K. 2020 document version Publisher's PDF, also known as Version of record Link to publication in VU Research Portal citation for published version (APA) Konoth, R. K. (2020). VULNERABLE BY DESIGN: MITIGATING DESIGN FLAWS IN HARDWARE AND SOFTWARE. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. E-mail address: [email protected] Download date: 07. Oct. 2021 VULNERABLE BY DESIGN: MITIGATING DESIGN FLAWS IN HARDWARE AND SOFTWARE PH.D. THESIS RADHESH KRISHNAN KONOTH VRIJE UNIVERSITEIT AMSTERDAM, 2020 Faculty of Science The research reported in this dissertation was conducted at the Faculty of Science — at the Department of Computer Science — of the Vrije Universiteit Amsterdam This work was supported by the MALPAY consortium, consisting of the Dutch national police, ING, ABN AMRO, Rabobank, Fox-IT, and TNO. -
Mac OS X and Ios Zero- Day Exploit
Mac OS X and iOS Zero- Day Exploit Security Advisory AE-Advisory 16-08 Criticality High Advisory Released On 28 March 2016 Impact Allows someone to escalate privileges and also to bypass system integrity Solution See the solution section below for mitigation processes. Affected Platforms Mac OS X 10.11.3 and older, iOS 9.2 and older Summary aeCERT has researched and found out about a new threat on Apple Mac OS X and iOS; with the release of OS X El Capitan, Apple introduced a security protection feature to the OS X kernel called System Integrity Protection (SIP). The feature is designed to prevent potentially malicious or bad software from modifying protected files and folders on your Mac. The purpose of SIP is to restrict the root account of OS X devices and limit the actions a root user can perform on protected parts of the system in an effort to reduce the chance of malicious code hijacking a device or performing privilege escalation. However, it has been uncovered a critical vulnerability in both OS X and iOS that allows for local privilege escalation as well as bypasses SIP without karnel exploit impacting all versions to date. Threat Details The zero day vulnerability is a Non-Memory Corruption bug that allows hackers to execute arbitrary code on any targeted machine, perform remote code execution (RCE) or sandbox escapes. The attacker then escalates the malware's privileges to bypass System Integrity Protection SIP, alter system files, and then stay on the infected system. By default, System Integrity Protection or SIP protects these folders: /System. -
Free, Functional, and Secure
Free, Functional, and Secure Dante Catalfamo What is OpenBSD? Not Linux? ● Unix-like ● Similar layout ● Similar tools ● POSIX ● NOT the same History ● Originated at AT&T, who were unable to compete in the industry (1970s) ● Given to Universities for educational purposes ● Universities improved the code under the BSD license The License The license: ● Retain the copyright notice ● No warranty ● Don’t use the author's name to promote the product History Cont’d ● After 15 years, the partnership ended ● Almost the entire OS had been rewritten ● The university released the (now mostly BSD licensed) code for free History Cont’d ● AT&T launching Unix System Labories (USL) ● Sued UC Berkeley ● Berkeley fought back, claiming the code didn’t belong to AT&T ● 2 year lawsuit ● AT&T lost, and was found guilty of violating the BSD license History Cont’d ● BSD4.4-Lite released ● The only operating system ever released incomplete ● This became the base of FreeBSD and NetBSD, and eventually OpenBSD and MacOS History Cont’d ● Theo DeRaadt ○ Originally a NetBSD developer ○ Forked NetBSD into OpenBSD after disagreement the direction of the project *fork* Innovations W^X ● Pioneered by the OpenBSD project in 3.3 in 2002, strictly enforced in 6.0 ● Memory can either be write or execute, but but both (XOR) ● Similar to PaX Linux kernel extension (developed later) AnonCVS ● First project with a public source tree featuring version control (1995) ● Now an extremely popular model of software development anonymous anonymous anonymous anonymous anonymous IPSec ● First free operating system to implement an IPSec VPN stack Privilege Separation ● First implemented in 3.2 ● Split a program into processes performing different sub-functions ● Now used in almost all privileged programs in OpenBSD like httpd, bgpd, dhcpd, syslog, sndio, etc. -
Make Least Privilege a Right
Make Least Privilege a Right (Not a Privilege) Maxwell Krohn∗, Petros Efstathopoulosy, Cliff Frey∗, Frans Kaashoek∗, Eddie Kohlery, David Mazieres` z, Robert Morris∗, Michelle Osbornez, Steve VanDeBogarty and David Ziegler∗ ∗MIT yUCLA zNYU [email protected] ABSTRACT ized mandatory access control [17]. The end result is a Though system security would benefit if programmers new operating system called Asbestos. routinely followed the principle of least privilege [24], 2 LESSONS FROM CURRENT SYSTEMS the interfaces exposed by operating systems often stand in the way. We investigate why modern OSes thwart se- Administrators and programmers can achieve POLP by cure programming practices and propose solutions. pushing the features in modern Unix-like operating sys- tems, but only partially, and with important practical 1 INTRODUCTION drawbacks. Though many software developers simultaneously revere 2.1 chrooting or jailing Greedy Applications and ignore the principles of their craft, they reserve spe- cial sanctimony for the principle of least privilege, or Because Unix grants privilege with coarse granularity, POLP [24]. All programmers agree in theory: an applica- many Unix applications acquire more privileges than tion should have the minimal privilege needed to perform they require. These “greedy applications” can be tamed its task. At the very least, five POLP requirements must with the chroot or jail system calls. Both calls con- be followed: (1) split applications into smaller protec- fine applications to jails, areas of the file system that tion domains, or “compartments”; (2) assign exactly the administrators can configure to exclude setuid executa- right privileges to each compartment; (3) engineer com- bles and sensitive files. -
Download the Ethical Hacker's Guide to System Hacking
The Ethical Hacker's Guide To System Hacking Attacker acquires information through techniques such as foot printing, scanning and enumeration to hack the target system. 1 Footprinting Scanning Enumeration Module Vulnerability Analysis It is the process of accumulating data Vulnerability Assessment is an This is a procedure for identifying This is a method of intrusive probing, Footprinting Scanning System Hacking regarding a specific network environment. active hosts, open ports, and unnecessary through which attackers gather examination of the ability of a system or In this phase, the attacker creates a profile services enabled on ports. Attackers use information such as network user lists, application, including current security CEH concepts of the target organization, obtaining different types of scanning, such as port routing tables, security flaws, and procedures, and controls to with stand 2 information such as its IP address range, scanning network scanning, and simple network protocol data (SNMP) assault. Attackers perform this analysis Methodology Vulnerability namespace and employees. Enumeration vulnerability, scanning of target networks data. to identify security loopholes, in the target Analysis Footprinting eases the process of or systems which help in identifying organization’s network, communication system hacking by revealing its possible vulnerabilities. infrastructure, and end systems. vulnerabilities 3 Clearing Logs Maintaining Access Gaining Access Hacking Stage Escalating Privileges Hacking Stage Gaining Access It involves gaining access to To maintain future system access, After gaining access to the target low-privileged user accounts by To acquire the rights of To bypass access CEH Hacking attackers attempt to avoid recognition system, attackers work to maintain cracking passwords through Goal another user or Goal controls to gain System Hacking by legitimate system users. -
LIBRARIES Building a Global Information Assurance Program.Pdf
Building a Global Information Assurance Program OTHER AUERBACH PUBLICATIONS The ABCs of IP Addressing Information Security Management Gilbert Held Handbook, 4th Edition, Volume 4 ISBN: 0-8493-1144-6 Harold F. Tipton and Micki Krause, Editors The ABCs of TCP/IP ISBN: 0-8493-1518-2 Gilbert Held Information Security Policies, ISBN: 0-8493-1463-1 Procedures, and Standards: Building an Information Security Guidelines for Effective Information Awareness Program Security Management Mark B. Desman Thomas R. Peltier ISBN: 0-8493-0116-5 ISBN: 0-8493-1137-3 Building a Wireless Office Information Security Risk Analysis Gilbert Held Thomas R. Peltier ISBN: 0-8493-1271-X ISBN: 0-8493-0880-1 The Complete Book of Middleware A Practical Guide to Security Engineering Judith Myerson and Information Assurance ISBN: 0-8493-1272-8 Debra Herrmann ISBN: 0-8493-1163-2 Computer Telephony Integration, 2nd Edition The Privacy Papers: William A. Yarberry, Jr. Managing Technology and Consumers, ISBN: 0-8493-1438-0 Employee, and Legislative Action Rebecca Herold Cyber Crime Investigator’s Field Guide ISBN: 0-8493-1248-5 Bruce Middleton ISBN: 0-8493-1192-6 Secure Internet Practices: Best Practices for Securing Systems in Cyber Forensics: A Field Manual for the Internet and e-Business Age Collecting, Examining, and Preserving Patrick McBride, Jody Patilla, Evidence of Computer Crimes Craig Robinson, Peter Thermos, Albert J. Marcella and Robert S. Greenfield, and Edward P. Moser Editors ISBN: 0-8493-1239-6 ISBN: 0-8493-0955-7 Securing and Controlling Cisco Routers Global Information Warfare: Peter T. Davis How Businesses, Governments, and ISBN: 0-8493-1290-6 Others Achieve Objectives and Attain Competitive Advantages Securing E-Business Applications and Andy Jones, Gerald L. -
Scalar I3 and I6 Open Source Software Licenses
Tape Automation Scalar i3 & Scalar i6, Firmware Release 1.1 (110G) Open Source Software Licenses Open Source Software (OSS) Licenses for: • Scalar i3 & Scalar i6 Firmware Release 1.1 (110G). The firmware/software contained in the Scalar i3 & Scalar i6 is an aggregate of vendor proprie- tary programs as well as third party programs, including Open Source Software (OSS). Use of OSS is subject to designated license terms and the following OSS license disclosure lists all open source components and applicable licenses that are part of the tape library firmware. All software that is designated as OSS may be copied, distributed, and/or modified in accordance with the terms and conditions of its respective license(s). Additionally, for some OSS you are entitled to obtain the corresponding OSS source files as required by the respective and applicable license terms. While GNU General Public License ("GPL") and GNU Lesser General Public Li- cense ("LGPL") licensed OSS requires that the sources be made available, Quantum makes all tape library firmware integrated OSS source files, whether licensed as GPL, LGPL or otherwise, available upon request. Please refer to the Scalar i3 & Scalar i6 Open Source License CD (part number 3-07787-01) when making such request. For contact information, see Getting More In- formation. LTO tape drives installed in the library may also include OSS components. For a complete list- ing of respective OSS packages and applicable OSS license information included in LTO tape drives, as well as instructions to obtain source files pursuant to applicable license requirements, please reference the Tape Automation disclosure listings under the Open Source Information link at www.quantum.com/support. -
Android Exploits Commanding Higher Price Than Ever Before
Memo 10/09/2019 - TLP:WHITE Android exploits commanding higher price than ever before Reference: Memo [190910-1] – Version: 1.0 Keywords: Android, iOS, exploit, vulnerability Sources: Zerodium, Google, Wired Key Points The price of android exploits exceeds the price of iOS exploits for the first time This is possibly because Android security is improving over iOS The release of Android 10 is also a likely cause for the price hike Summary Zerodium1, a cyber security exploit broker dealing in zero-day vulnerabilities, has published its most recent price list. It indicates that the price of an Android full-chain exploit with persistence can fetch the developer up to 2,500,000 dollars. The going rate for a similar exploit for Apple’s iOS has gone down by 500,000 dollars and is now worth 2,000,000. This is the first confirmed time when Android exploits are valued more than iOS. Zerodium payouts for mobile devices Up to $2,500,000 Android zero click full compromise chain with persistence. Up to $2,000,000 iOS zero click full compromise chain with persistence. Up to $1,500,000 WhatsApp zero click remote code execution with iMessage remote code execution with local local privilege escalation on iOS or Android. privilege escalation. Up to $1,000,000 WhatsApp remote code execution with local privilege SMS/MMS remote code execution with local escalation on iOS or Android. privilege escalation on iOS or Android. Comments Zero-click exploits do not require interaction from the user. This is very difficult to achieve and thus commands the highest prices.