Download e-book for iPad: Buffer Overflow Attacks: Detect, Exploit, Prevent by James C. Foster, Vitaly Osipov, Nish Bhalla

By James C. Foster, Vitaly Osipov, Nish Bhalla

ISBN-10: 1932266674

ISBN-13: 9781932266672

The SANS Institute continues a listing of the "Top 10 software program Vulnerabilities." on the present time, over half those vulnerabilities are exploitable through Buffer Overflow assaults, making this category of assault the most universal and most deadly weapon utilized by malicious attackers. this is often the 1st booklet particularly aimed toward detecting, exploiting, and combating the most typical and unsafe attacks.

Buffer overflows make up one of many greatest collections of vulnerabilities in life; And a wide percent of attainable distant exploits are of the overflow type. just about all of the main devastating desktop assaults to hit the web lately together with SQL Slammer, Blaster, and that i Love You assaults. If achieved effectively, an overflow vulnerability will let an attacker to run arbitrary code at the victim's desktop with the an identical rights of whichever approach was once overflowed. this is used to supply a distant shell onto the sufferer laptop, which might be used for additional exploitation.

A buffer overflow is an unforeseen habit that exists in sure programming languages. This e-book offers particular, actual 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 relating to buffer overflows.

*None of the current-best promoting software program defense books concentration completely on buffer overflows.

*This booklet presents particular, actual code examples on exploiting buffer overflow assaults from a hacker's standpoint and protecting opposed to those assaults for the software program developer.

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Extra resources for Buffer Overflow Attacks: Detect, Exploit, Prevent

Example text

One workaround for this is to let the shellcode terminate the string at run time by placing a NULL byte at the end of it. ”. Then we place al, the 8-bit version of EAX, at offset 14 of our string. ” will be NULL terminated—didn’t have to use a NULL byte in the shellcode. Not choosing the right registers or data types may also result in shellcode that contains NULL bytes. For example, the instruction, mov eax,1, is translated by the compiler into: mov eax,0x00000001 The compiler does this translation because we explicitly ask the 32-bit register EAX to be filled with the value 1.

A: As of late, in widely used applications they are rarely found because they can be checked for in code fairly quickly. Q: What is the best way to prevent software vulnerabilities? A: A combination of developer education for defensive programming techniques as well as software reviews is the best initial approach to improving the security of custom software. 23 Chapter 2 Understanding Shellcode Solutions in this Chapter: ■ Overview of Shellcode ■ The Addressing Problem ■ The Null Byte Problem ■ Implementing System Calls ■ Remote Shellcode ■ Local Shellcode Introduction Writing shellcode involves an in-depth understanding of assembly language for the target architecture in question.

When program source code is compiled, it may only run on the system for which it was compiled. Interpreted languages, such as Java, do not have such a restriction. Every system which has an inter- Buffer Overflows: The Essentials • Chapter 1 preter for the language will be able to run the same program code. This function is subject to security implications because a format string specifier can be passed to the function call that specifies how the data being output should be displayed. If the format string specifier is not specified, a software bug exists that could potentially be a vulnerability.

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Buffer Overflow Attacks: Detect, Exploit, Prevent by James C. Foster, Vitaly Osipov, Nish Bhalla

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