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THINC: a Virtual and Remote Display Architecture for Desktop Computing and Mobile Devices
THINC: A Virtual and Remote Display Architecture for Desktop Computing and Mobile Devices Ricardo A. Baratto Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Graduate School of Arts and Sciences COLUMBIA UNIVERSITY 2011 c 2011 Ricardo A. Baratto This work may be used in accordance with Creative Commons, Attribution-NonCommercial-NoDerivs License. For more information about that license, see http://creativecommons.org/licenses/by-nc-nd/3.0/. For other uses, please contact the author. ABSTRACT THINC: A Virtual and Remote Display Architecture for Desktop Computing and Mobile Devices Ricardo A. Baratto THINC is a new virtual and remote display architecture for desktop computing. It has been designed to address the limitations and performance shortcomings of existing remote display technology, and to provide a building block around which novel desktop architectures can be built. THINC is architected around the notion of a virtual display device driver, a software-only component that behaves like a traditional device driver, but instead of managing specific hardware, enables desktop input and output to be intercepted, manipulated, and redirected at will. On top of this architecture, THINC introduces a simple, low-level, device-independent representation of display changes, and a number of novel optimizations and techniques to perform efficient interception and redirection of display output. This dissertation presents the design and implementation of THINC. It also intro- duces a number of novel systems which build upon THINC's architecture to provide new and improved desktop computing services. The contributions of this dissertation are as follows: • A high performance remote display system for LAN and WAN environments. -
Free and Open Source Software Is Not a “Free for All”: German Court Enforces GPL License Terms
Free and Open Source Software Is Not A “Free For All”: German Court Enforces GPL License Terms The GNU General Public License, computer programs, and to guarantee version 2 (GPLv2) scores another the same rights to the recipients of court victory for the free and/or open works licensed under the GPLv2. source software (FOSS) community. Although the open-source movement The GPLv2 carries important has been active for nearly two conditions, however, most notably— decades, globally there are only and critical for its viability—that any a handful of cases in which a FOSS distribution of software licensed under license has been reviewed by — let the GPLv2 must be accompanied with alone receive the imprimatur of the “complete corresponding machine- enforceability from — a court. The readable source code” or “a written latest case hails from Germany and offer … to give any third party … a serves to underscore the importance complete machine-readable copy of of proper FOSS-license compliance the corresponding source code”. throughout the software development GPLv2, Sections 3(a) and 3(b). process and supply chain, including During a “Hacking for Compliance the obligation of distributors to Workshop” organized in Berlin in 2012 independently verify FOSS-license by the Free Software Foundation compliance representations from their Europe, the source code package for a suppliers. media player with GNU/Linux-based Welte v. Fantec firmware inside was found not to contain the source code for the Harald Welte, founder of gpl- iptables components. It was also violations.org (a non-profit discovered that the source code for organization aiming at the other device components was not the enforcement of GPL license terms), is same version used to compile the the owner of “netfilter/iptables” firmware’s binary code. -
Open Source Software Notice
OPEN SOURCE SOFTWARE NOTICE DCS Touch Display Software V2.00.XXX Schüco International KG Karolinenstraße 1-15 33609 Bielefeld OPEN SOURCE SOFTWARE NOTICE Seite 1 von 32 10000507685_02_EN OPEN SOURCE SOFTWARE NOTICE This document contains information about open source software for this product. The rights granted under open source software licenses are granted by the respective right holders. In the event of conflicts between SCHÜCO’S license conditions and the applicable open source licenses, the open source license conditions take precedence over SCHÜCO’S license conditions with regard to the respective open source software. You are allowed to modify SCHÜCO’S proprietary programs and to conduct reverse engineering for the purpose of debugging such modifications, to the extent such programs are linked to libraries licensed under the GNU Lesser General Public License. You are not allowed to distribute information resulting from such reverse engineering or to distribute the modified proprietary programs. The rightholders of the open source software require to refer to the following disclaimer, which shall apply with regard to those rightholders: Warranty Disclaimer THE OPEN SOURCE SOFTWARE IN THIS PRODUCT IS DISTRIBUTED ON AN "AS IS" BASIS AND IN THE HOPE THAT IT WILL BE USEFUL, BUT WITHOUT ANY WARRANTY OF ANY KIND, WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. SEE THE APPLICABLE LICENSES FOR MORE DETAILS. OPEN SOURCE SOFTWARE NOTICE Seite 2 von 32 10000507685_02_EN Copyright Notices and License Texts (please see the source code for all details) Software: iptables Copyright notice: Copyright (C) 1989, 1991 Free Software Foundation, Inc. Copyright Google, Inc. -
On Trends in Low-Level Exploitation
On trends in low-level exploitation Christian W. Otterstad Department of Informatics, University of Bergen Abstract Low-level computer exploitation and its mitigation counterpart has accumulated some noteworthy history. Presently, especially in academia, it features a plethora of mitigation techniques and also various possible modes of attack. It has seen numerous developments building upon basic methods for both sides and certain trends have emerged. This paper is primarily an overview paper, focusing especially on x86 GNU/Linux. The basic reasons inherent for allowing low-level exploitability are identified and explained to provide background knowledge. The paper furthermore describes the history, present state of the art and future developments that are topical and appear to be important in the field. Several attack and defense techniques have overlapping notions with not always obvious differences. Herein the notion of the bar being raised for both exploits and mitigation methods is examined and extrapolated upon based on the known relevant present state and history. The difference between academia and the industry is discussed especially where it relates to application of new mitigation techniques. Based on this examination some patterns and trends are identified and a conjecture for the likely future development of both is presented and justified. This paper was presented at the NIK-2016 conference; see http://www.nik.no/. 1 Introduction and earlier related work In 1972 the paper “Computer Security Technology Planning Study” was published [1]. Since then, research surrounding the main ideas in this paper has grown to become a ma- ture and complex field in its own right. There are many different exploitation techniques and mitigation techniques. -
Netfilter's Connection Tracking System
FILTERING POLICIES BASED UNIQUELY on packet header information are obsolete. PABLO NEIRA AYUSO These days, stateful firewalls provide advanced mechanisms to let sysadmins Netfilter’s and security experts define more intelli- gent policies. This article describes the connection implementation details of the connection tracking system tracking system provided by the Netfilter project and also presents the required Pablo Neira Ayuso has an M.S. in computer science background to understand it, such as an and has worked for several companies in the IT secu- rity industry, with a focus on open source solutions. understanding of the Netfilter framework. Nowadays he is a full-time teacher and researcher at the University of Seville. This article will be the perfect complement to understanding the subsystem that [email protected] enables the stateful firewall available in any recent Linux kernel. The Netfilter Framework The Netfilter project was founded by Paul “Rusty” Russell during the 2.3.x development series. At that time the existing firewalling tool for Linux had serious drawbacks that required a full rewrite. Rusty decided to start from scratch and create the Netfilter framework, which comprises a set of hooks over the Linux network protocol stack. With the hooks, you can register kernel modules that do some kind of network packet handling at different stages. Iptables, the popular firewalling tool for Linux, is commonly confused with the Netfilter framework itself. This is because iptables chains and hooks have the same names. But iptables is just a brick on top of the Netfilter framework. Fortunately, Rusty spent considerable time writ- ing documentation [1] that comes in handy for anyone willing to understand the framework, al- though at some point you will surely feel the need to get your hands dirty and look at the code to go further. -
Third-Party License Acknowledgments
Symantec Privileged Access Manager Third-Party License Acknowledgments Version 3.4.3 Symantec Privileged Access Manager Third-Party License Acknowledgments Broadcom, the pulse logo, Connecting everything, and Symantec are among the trademarks of Broadcom. Copyright © 2021 Broadcom. All Rights Reserved. The term “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. For more information, please visit www.broadcom.com. Broadcom reserves the right to make changes without further notice to any products or data herein to improve reliability, function, or design. Information furnished by Broadcom is believed to be accurate and reliable. However, Broadcom does not assume any liability arising out of the application or use of this information, nor the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. 2 Symantec Privileged Access Manager Third-Party License Acknowledgments Contents Activation 1.1.1 ..................................................................................................................................... 7 Adal4j 1.1.2 ............................................................................................................................................ 7 AdoptOpenJDK 1.8.0_282-b08 ............................................................................................................ 7 Aespipe 2.4e aespipe ........................................................................................................................ -
Next Generation Web Scanning Presentation
Next generation web scanning New Zealand: A case study First presented at KIWICON III 2009 By Andrew Horton aka urbanadventurer NZ Web Recon Goal: To scan all of New Zealand's web-space to see what's there. Requirements: – Targets – Scanning – Analysis Sounds easy, right? urbanadventurer (Andrew Horton) www.morningstarsecurity.com Targets urbanadventurer (Andrew Horton) www.morningstarsecurity.com Targets What does 'NZ web-space' mean? It could mean: •Geographically within NZ regardless of the TLD •The .nz TLD hosted anywhere •All of the above For this scan it means, IPs geographically within NZ urbanadventurer (Andrew Horton) www.morningstarsecurity.com Finding Targets We need creative methods to find targets urbanadventurer (Andrew Horton) www.morningstarsecurity.com DNS Zone Transfer urbanadventurer (Andrew Horton) www.morningstarsecurity.com Find IP addresses on IRC and by resolving lots of NZ websites 58.*.*.* 60.*.*.* 65.*.*.* 91.*.*.* 110.*.*.* 111.*.*.* 113.*.*.* 114.*.*.* 115.*.*.* 116.*.*.* 117.*.*.* 118.*.*.* 119.*.*.* 120.*.*.* 121.*.*.* 122.*.*.* 123.*.*.* 124.*.*.* 125.*.*.* 130.*.*.* 131.*.*.* 132.*.*.* 138.*.*.* 139.*.*.* 143.*.*.* 144.*.*.* 146.*.*.* 150.*.*.* 153.*.*.* 156.*.*.* 161.*.*.* 162.*.*.* 163.*.*.* 165.*.*.* 166.*.*.* 167.*.*.* 192.*.*.* 198.*.*.* 202.*.*.* 203.*.*.* 210.*.*.* 218.*.*.* 219.*.*.* 222.*.*.* 729,580,500 IPs. More than we want to try. urbanadventurer (Andrew Horton) www.morningstarsecurity.com IP address blocks in the IANA IPv4 Address Space Registry Prefix Designation Date Whois Status [1] ----- -
Free Open Source Vnc
Free open source vnc click here to download TightVNC - VNC-Compatible Remote Control / Remote Desktop Software. free for both personal and commercial usage, with full source code available. TightVNC - VNC-Compatible Remote Control / Remote Desktop Software. It's completely free but it does not allow integration with closed-source products. UltraVNC: Remote desktop support software - Remote PC access - remote desktop connection software - VNC Compatibility - FileTransfer - Encryption plugins - Text chat - MS authentication. This leading-edge, cloud-based program offers Remote Monitoring & Management, Remote Access &. Popular open source Alternatives to VNC Connect for Linux, Windows, Mac, Self- Hosted, BSD and Free Open Source Mac Windows Linux Android iPhone. Download the original open source version of VNC® remote access technology. Undeniably, TeamViewer is the best VNC in the market. Without further ado, here are 8 free and some are open source VNC client/server. VNC remote access software, support server and viewer software for on demand remote computer support. Remote desktop support software for remote PC control. Free. All VNCs Start from the one piece of source (See History of VNC), and. TigerVNC is a high- performance, platform-neutral implementation of VNC (Virtual Network Computing), Besides the source code we also provide self-contained binaries for bit and bit Linux, installers for Current list of open bounties. VNC (Virtual Network Computing) software makes it possible to view and fully- interact with one computer from any other computer or mobile. Find other free open source alternatives for VNC. Open source is free to download and remember that open source is also a shareware and freeware alternative. -
Linuxové Noviny
03–04/99Linuxove´noviny U´ vodem Mı´t svuj˚ vlastnı´sen... ehm, firewall Pavel Janı´k ml., 10. dubna 1998 Jisteˇ jste se dostali nebo tˇreba dostanete do situace, kdy Dva mesı´ceˇ ubehlyˇ jako voda a opetˇ je tu dalsˇı´ cı´sloˇ Linuxo- va´s nekdoˇ vyzve, abyste vyrobili z Linuxu zabezpeceny´po-ˇ vy´ch novin, ktere´va´m pˇrina´sˇejı´ty nejzajı´mavejsˇı´informaceˇ cı´taˇ cˇ — firewall. Na´stroje i podpora pˇrı´mo v kernelu na to ze svetaˇ Linuxu a vubec˚ denı´kolemˇ nej.ˇ To vsˇenezanese- existujı´, ale nejvetsˇı´proble´mˇ je s definova´nı´m vsˇechpo- ne´komercnı´miˇ dezinformacemi a novina´ˇrsky´m hyenismem tˇrebny´ch pra´v pro vstup/vy´stup do vnitˇrnı´sı´te,ˇ ktera´je po- (© DusˇanKory´tko:-) — pouhe´ ciste´informace.ˇ tˇreba hlı´dat. Pro ˇresˇenı´tohoto u´kolu ma´te nynı´pomocnı´- Co va´m tedy pˇrina´sˇı´toto cı´slo?ˇ Pˇredevsˇı´m je nutno kon- ka, skript jme´nem Mason (1), ktery´doka´zˇe ˇresˇitvsˇepo- statovat, zˇe je zameˇˇreno na prakticke´ota´zky dnesˇnı´ho li- tˇrebne´. Skript vyuzˇı´va´logu˚ od programu˚ ipchains a ip- nuxove´ho zˇivota, tedy na programova´nı´webovy´ch aplikacı´, fwadm, sleduje provoz na sı´ti, ma´podporu pro PPP spojenı´ bezpecnost,ˇ framebuffer a dalsˇı´. Ale postupne:ˇ a spoustu dalsˇı´ch uzˇitecny´chˇ vlastnostı´. S jeho pomocı´lze Jako v kazˇde´m cı´sleˇ na´m Radek Vybı´ral pˇredstavı´nej- snadno sestavit potˇrebna´pravidla pro provoz firewallu. novejsˇı´programyˇ pro Linux v rubrice Cerstve´masoˇ pro Li- nux. -
Load Balancing for Heterogeneous Web Servers
Load Balancing for Heterogeneous Web Servers Adam Pi´orkowski1, Aleksander Kempny2, Adrian Hajduk1, and Jacek Strzelczyk1 1 Department of Geoinfomatics and Applied Computer Science, AGH University of Science and Technology, Cracow, Poland {adam.piorkowski,jacek.strzelczyk}@agh.edu.pl http://www.agh.edu.pl 2 Adult Congenital and Valvular Heart Disease Center University of Muenster, Muenster, Germany [email protected] http://www.ukmuenster.de Abstract. A load balancing issue for heterogeneous web servers is de- scribed in this article. The review of algorithms and solutions is shown. The selected Internet service for on-line echocardiography training is presented. The independence of simultaneous requests for this server is proved. Results of experimental tests are presented3. Key words: load balancing, scalability, web server, minimum response time, throughput, on-line simulator 1 Introduction Modern web servers can handle millions of queries, although the performance of a single node is limited. Performance can be continuously increased, if the services are designed so that they can be scaled. The concept of scalability is closely related to load balancing. This technique has been used since the beginning of the first distributed systems, including rich client architecture. Most of the complex web systems use load balancing to improve performance, availability and security [1{4]. 2 Load Balancing in Cluster of web servers Clustering of web servers is a method of constructing scalable Internet services. The basic idea behind the construction of such a service is to set the relay server 3 This is the accepted version of: Piorkowski, A., Kempny, A., Hajduk, A., Strzelczyk, J.: Load Balancing for Heterogeneous Web Servers. -
AN OPEN SOURCE WEB SOLUTION Lighttpd Web Server and Chip Multithreading Technology
AN OPEN SOURCE WEB SOLUTION Lighttpd Web Server and Chip Multithreading Technology Reference Implementation Amanda Waite, Sun Microsystems Sun BluePrints™ Online — September 2008 Part No 820-5633-10 Revision 1.0, 9/23/08 Sun Microsystems, Inc. Table of Contents Reference Implementation . 1 The Web 2.0 Kit. 2 Hardware and Software Configuration . 3 Workload Test Descriptions. 4 The Faban Harness and Driver Framework . 4 Performance Tuning . 5 Opcode Caching . 5 Temporary Files . 9 Sizing the Number of Lighttpd Web Server and PHP Processes . 9 Database Configuration . 12 Lighttpd Web Server Configuration. 13 Memcached . 13 Network Interface Card Interrupt Handling . 13 Nagle’s Algorithm. 16 Network I/O . 17 Best Practices for Deployment . 18 Conclusion . 20 About the Author . 20 References . 20 Ordering Sun Documents . 21 Accessing Sun Documentation Online . 21 1 An Open Source Web Solution Sun Microsystems, Inc. An Open Source Web Solution With more users interacting, working, purchasing, and communicating over the network than ever before, Web 2.0 infrastructure is taking center stage in many organizations. Demand is rising, and companies are looking for ways to tackle the performance and scalability needs placed on Web infrastructure without raising IT operational expenses. Today companies are turning to efficient, high-performance, open source solutions as a way to decrease acquisition, licensing, and other ongoing costs and stay within budget constraints. The combination of open source Lighttpd Web server software and Sun servers with CoolThreads™ technology provides a scalable, high-performance, and cost-effective solution for Web environments. This Sun BluePrints™ article describes a reference implementation based on the Lighttpd Web server software and Sun SPARC® Enterprise T5120 servers, and explores its performance and scalability when running dynamic workloads. -
Detecting Exploit Code Execution in Loadable Kernel Modules
Detecting Exploit Code Execution in Loadable Kernel Modules HaizhiXu WenliangDu SteveJ.Chapin Systems Assurance Institute Syracuse University 3-114 CST, 111 College Place, Syracuse, NY 13210, USA g fhxu02, wedu, chapin @syr.edu Abstract and pointer checks can lead to kernel-level exploits, which can jeopardize the integrity of the running kernel. Inside the In current extensible monolithic operating systems, load- kernel, exploitcode has the privilegeto interceptsystem ser- able kernel modules (LKM) have unrestricted access to vice routines, to modify interrupt handlers, and to overwrite all portions of kernel memory and I/O space. As a result, kernel data. In such cases, the behavior of the entire sys- kernel-module exploitation can jeopardize the integrity of tem may become suspect. the entire system. In this paper, we analyze the threat that Kernel-level protection is different from user space pro- comes from the implicit trust relationship between the oper- tection. Not every application-level protection mechanism ating system kernel and loadable kernel modules. We then can be applied directly to kernel code, because privileges present a specification-directed access monitoring tool— of the kernel environment is different from that of the user HECK, that detects kernel modules for malicious code ex- space. For example, non-executableuser page [21] and non- ecution. Inside the module, HECK prevents code execution executable user stack [29] use virtual memory mapping sup- on the kernel stack and the data sections; on the bound- port for pages and segments, but inside the kernel, a page ary, HECK restricts the module’s access to only those kernel or segment fault can lead to kernel panic.