Buffer Overflow: The Complete Documentation

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This category contains 14 Papers The last paper was added on 2006-06-19 (YYYY-MM-DD)
Buffer Overflow for kids
Published on July 10, 2002 - by bob, bob.
This tutorial is not going to teach you how to code an exploit, but what it is going to do is give you a good understanding of what a buffer overflow is, what types of buffer overflows there are, how we would go about exploiting a buffer overflow, and how to identify a buffer overlow.
Buffer Overflow for kids II
Published on July 15, 2002 - by bob, bob.
This is part two, the follow on from bofs4kids. If you not have read the first one i suggest you do so. The first one gives you a good understanding of whats what. Now in this tutorial im going to attempt to give you the knowledge to be able to exploit a program, without coding in C. But we will need to use gdb quite a bit, so any prior knowledge would be helpful but not necessary. As usual ill do the jargon buster first so that we can get the confusing words or abbrieviations out of the way.
BUFFER OVERFLOWS DEMYSTIFIED
Published on 2001 - by Murat Balaban, ©EnderUNIX.
Emergence of buffer overflow vulnerabilities dates back to 1970s. Morris Worm (1980s) can be considered the first public use of them. Documents such as Aleph1‘s famous "Smashing the Stack for Fun and Profit" and code related to it has been being published on the Internet since 1990s.
Buffer Overflows with Content
Published on - by , The CISSP and SSCP Open Study Guides Web site.
BUFFER OVERFLOWS ARE AT THE TOP OF the lethality food chain.This is the technique attackers use again and again to grab root, or the corresponding administrative account of a system. If you are going to detect intrusions, these are the ones to focus on! To understand how to tune a network-based IDS to detect buffer overflows, the intrusion analyst must comprehend the nature of these attacks.This chapter commences with a brief explanation of the mechanics of buffer overflows, and then digs in and looks at traces and analysis from actual buffer overflows, discusses how to detect buffer overflows and, finally, concludes with some defensive recommendations to reduce the risks that they pose.
Bypassing 3rd Party Windows Buffer Overflow Protection
Published on 2004-07-13 - by Jamie Butler, ©Phrack Magazine.
Recently, a number of commercial security systems started to offer protection against buffer overflows. This paper analyzes the protection claims and describes several techniques to bypass the buffer overflow protection. Existing commercial systems implement a number of techniques to protect against buffer overflows. Currently, stack backtracing is the most popular one. It is also the easiest to implement and the easiest to bypass. Several commercial products such as Entercept (now NAI Entercept) and Okena (now Cisco Security Agent) implement this technique.
Compromised - Buffer-Overflows, from Intel to SPARC Version 8
Published on October 04, 1996 - by mudge, mudge.
A buffer overflow occurs when an object of size x+y is placed into a container of size x. This can happen in many situations when the programmer does not take proper care to bounds check what their functions do and what they are placing into variables inside their programs. As usual, the fun begins when this programming mistake is made at a place that allows user definable data to be inserted.
Countering buffer overflows
Published on 2004-01-27 - by David A. Wheeler, ©IBM.
This article discusses the top vulnerability in Linux/UNIX systems: buffer overflows. This article first explains what buffer overflows are and why they‘re both so common and so dangerous. It then discusses the new Linux and UNIX methods for broadly countering them # and why these methods are not enough. It then shows various ways to counter buffer overflows in C/C++ programs, both statically-sized approaches (such as the standard C library and OpenBSD/strlcpy solution) and dynamically-sized solutions, as well as some tools to help you. Finally, the article closes with some predictions on the future of buffer overflow vulnerabilities.
Guarded Memory Move (GMM) Buffer Overflow Detection And Analysis
Published on January 17, 2004 - by Davide Libenzi, ©Davide Libenzi.
Buffer overflow attacks have become more and more frequent with the advent of the Internet. The public exposure of network servers and the increased popularity of the Internet, have increased dramatically attempts to hijack publicly available servers. The advent and the increased popularity of Open Source also, while increasing the stability and the architecture of existing software through cooperation, gave hackers the key to spot vulnerabilities and to exactly calculate frame addresses. Many famous packages like bind, wu_ftp, apache and sendmail, just to keep the list short, have been subject of buffer overflow vulnerabilities. When running a public Internet servers, it is always a good idea to harden your system using tools like stack execution protection, random binaries relocation and so on. Those methods, while giving protection about remote exploits, are very poor when it comes to forensic analysis and debugging of the attack. It is the purpose of this document to introduce a new method called Guarded Memory Move or, more shortly, GMM.
how to code stack based exploits
Published on March 2000 - by dethy, dethy.
Buffer overflows are the result of stuffing more data into a buffer than it can handle. Upon writing past the buffer, the program will often lead to unknown results, even the potential to execute arbitary code, if a certain memory pointer is overwritten.
How to write Buffer Overflows
Published on 10/20/95 - by mudge, ©l0pht.
This is really rough, and some of it is not needed. I wrote this as a reminder note to myself as I really didn‘t want to look at any more AT&T assembly again for a while and was afraid I would forget what I had done. If you are an old assembly guru then you might scoff at some of this... oh well, it works and that‘s a hack in itself.
Introduction: Buffer Overflow Vulnerabilities
Published on 2005-04-14 - by Erica R. Thomas, ©Erica R. Thomas.
Buffer overflow vulnerabilities are one of the most common vulnerabilities. These kinds of vulnerabilities are perfect for remote access attacks because they give the attacker a great opportunity to launch and execute their attack code on the target computer. Broadly speaking, a buffer overflow attack occurs when the attacker intentionally enters more data than a program was written to handle. The data runs over and overflows the section of memory that was set aside to accept it. The extra data overwrites on top on another portion of memory that was meant to hold something else, like part of the program‘s instructions. This allows an attacker to overwrite data that controls the program and can takeover control of the program to execute the attacker‘s code instead of the program. Peikari and Chuvakin point out that, buffer overflows result from an inherent weakness in the C++ programming language. (Peikari and Chuvakin, 2004) The problem is that C++ and other programming languages (those derived from C++), do not automatically perform bounds-checking when passing data. When variables are passed, extra characters could be written past the variable‘s end. The overflow consequence could result in the program crashing or allowing the attacker to execute their own code on the target system.
Testing C Programs for Buffer Overflow Vulnerabilities
Published on 2005 - by Eric Haugh and Matt Bishop, ©Eric Haugh and Matt Bishop.
Security vulnerabilities often result from buffer overflows. A testing technique that instruments programs with code that keeps track of memory buffers, and checks arguments to functions to determine if they satisfy certain conditions, warns when a buffer overflow may occur. It does so when executed with normal test data as opposed to test data designed to trigger buffer overflows. A tool using this method was developed and evaluated by testing three widely used, open source software packages. This evaluation shows that the tool is useful for finding buffer overflow flaws, that it has a low false positive rate, and compares well with other techniques.
Writing Buffer Overflow Exploits with Perl
Published on 2000 - by teleh0r, ©teleh0r.
This paper is for those who want a practical approach to writing buffer overflow exploits. As the title says, this text will teach you how to write these exploits in Perl. If you want a more in-depth guide, please take a look at the links provided at the end of this paper, and read those instead.