PPT-Buffer Overflows

Many of the following slides are based on those from Complete Powerpoint Lecture Notes for Computer Systems A Programmers Perspective CSAPP Randal E Bryant and David R OHallaron. More over buffer overflow vulnerabilities dominate the area of remote network penetra tion vulnerabilities where an anonymous Inter net user seeks to gain partial or total control of a host If buffer overflow vulnerabilities could be effectively eli . Attacker’s goal. :. Take over target machine (e.g. web server). Execute arbitrary code on target by . hijacking application control flow. This lecture: three examples.. Buffer overflow attacks. Overflow Example. Dan Fleck. CS469 Security Engineering. Reference: . http://. www.thegeekstuff.com. /2013/06/buffer-overflow/ . Coming up: Buffer Overflows. 1. 1. Buffer Overflows. Buffer overflows occur when some sized portion of memory is overwritten with something bigger.. Marx Caesar S. . Barluado. Mishari. Rashid M. . Lucman. What is the study all about?. The study aims to determine whether crushed crab shells can be a potential pH buffer. Crushed crab shells contain calcium carbonate which is believed to be a potential pH buffer. Which then leads to production of cheaper buffers compared to commercial ones.. Yoni . Nazarathy. ,. Swinburne University of Technology, Melbourne.. Stijn. . Fleuren. and . Erjen. . Lefeber. ,. Eindhoven University of Technology, the Netherlands.. Talk Outline. Background: Open Jackson networks. C memory layout. We talked about the heap and stack last time.. Heap: dynamically allocated data (so grows and shrinks depending on objects created). Stack: grows and shrinks as functions are called and return. Serious Note. Try a web search for “buffer overflow exploit”.. Check alt.2600, rootshell.com, antionline.com – you can find long lists of . exploits. based on buffer overflow.. Even the original version of . overflow. Cecilia Menéndez González. Erick Giovanni Sánchez Madero. Miguel Ángel González Alarcón. Una de las mayores vulnerabilidades de seguridad que tienen los actuales . sistemas . operativos y programas es ser sensibles a un desbordamiento de buffer, o como mejor se les conoce: Buffer . Trausti Saemundsson, . Reykjavik University. Introduction. I am Trausti Saemundsson, a MSc student at Reykjavik University in Iceland . My supervisor is Ymir Vigfusson . I´m here in London doing research with Gregory Chockler on a multitenant cache algorithm . & . Rootkits. Warning. Do not use hacking tools unless you are . sure . you have . sysadmin’s. permission.. Company policy .  fired/suspended. Illegal Go to Jail. Honor Code. Just because you have a set of master-keys does NOT give you permission to drive anyone’s car!. David Brumley. Carnegie Mellon University. You will find. a. t least one . error. on each set of slides. . :). 2. Red. format c:. Blue. vs.. 3. An Epic Battle. Red. format c:. Blue. Bug. 4. Find. . Exploitable. modified from slides of . Lawrie. Brown. Buffer Overflow. a very common attack mechanism. first wide use by the Morris Worm in 1988. prevention techniques known. still of major concern. legacy of buggy code in widely deployed operating systems and applications. based on those . from . Complete . Powerpoint. Lecture Notes for. Computer Systems: A Programmer's Perspective (CS:APP). Randal E. Bryant. and . David R. . O'Hallaron. . http://. www.cs.cmu.edu/afs/cs/academic/class/15213-f15/www/schedule.html. A saturated buffer is an area of perennial vegetation between agricultural fields and waterways where tile outlets drain. . Conventional Tile Outlet Tile Outlet with Saturated Buffer.