Download Buffer Overflow Attacks: Detect, Exploit, Prevent by Erik Pace Birkholz PDF

By Erik Pace Birkholz

The SANS Institute keeps a listing of the "Top 10 software program Vulnerabilities. on the present time, over half those vulnerabilities are exploitable by way of Buffer Overflow assaults, making this classification of assault the most universal and most deadly weapon utilized by malicious attackers. this is often the 1st booklet in particular aimed toward detecting, exploiting, and combating the commonest and hazardous attacks.Buffer overflows make up one of many biggest collections of vulnerabilities in life; And a wide percent of attainable distant exploits are of the overflow kind. just about all of the main devastating computing device assaults to hit the web in recent times together with SQL Slammer, Blaster, and that i Love You assaults. If done appropriately, an overflow vulnerability will let an attacker to run arbitrary code at the victim's computing device with the identical rights of whichever strategy was once overflowed. this is used to supply a distant shell onto the sufferer computing device, that are used for additional exploitation.A buffer overflow is an unforeseen habit that exists in sure programming languages. This e-book offers particular, genuine code examples on exploiting buffer overflow assaults from a hacker's standpoint and protecting opposed to those assaults for the software program developer.Over half the "SANS best 10 software program Vulnerabilities" are concerning buffer overflows. not one of the current-best promoting software program safeguard books concentration completely on buffer overflows. This e-book presents particular, actual code examples on exploiting buffer overflow assaults from a hacker's point of view and protecting opposed to those assaults for the software program developer.

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Additional info for Buffer Overflow Attacks: Detect, Exploit, Prevent

Sample text

While most of the slang is generated these days online via chat sessions, specifically IRC, it is also being passed around in white papers, conference discussions, and just by word of mouth. Since buffer overflows will dive into code, complex computer and software topics, and techniques for automating exploitation, we felt it necessary to document some of the commonest terms just to ensure that everyone is on the same page. Hardware The following definitions are commonly utilized to describe aspects of computers and their component hardware as they relate to security vulnerabilities: Buffer Overflows: The Essentials • Chapter 1 ■ MAC In this case, we are directly referring to the hardware (or MAC) address of a particular computer system.

After a programmer writes a program in a high-level 15 16 Chapter 1 • Buffer Overflows: The Essentials language, such as C, a compiler translates that code into machine code. This code can be stored for later reuse. ■ Malloc The malloc function call dynamically allocates n number of bytes on the heap. Many vulnerabilities are associated with the way this data is handled. This function has similar security implication as strncpy. ■ Method A method is another name for a function in languages such as Java and C#.

The most common type of exploitable vulnerability is a stack overflow. String functions such as strcpy, strcat, and so on are common starting points when looking for stack overflows in source code. ■ Vulnerability A vulnerability is an exposure that has the potential to be exploited. Most vulnerabilities that have real-world implications are specific software bugs. However, logic errors are also vulnerabilities. This logic, or design error, is not fundamentally a software bug. Summary Buffer overflow vulnerabilities are decreasing throughout the industry because of developer education, inherently secure (from a memory management perspective) programming languages, and tools available to assist developers.

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