James C. Foster, Vincent T. Liu's Writing Security Tools and Exploits PDF

By James C. Foster, Vincent T. Liu

Writing defense instruments and Exploits could be the optimum authority on vulnerability and safeguard code and should function the leading academic reference for safety pros and software program builders. The e-book may have over six hundred pages of devoted make the most, vulnerability, and gear code with corresponding guideline. in contrast to different safety and programming books that commit hundreds and hundreds of pages to structure and thought established flaws and exploits, this publication will dive correct into deep code research. formerly undisclosed safety learn together with better programming recommendations might be incorporated in either the neighborhood and distant Code sections of the book.

The publication should be followed with a spouse website containing either commented and uncommented types of the resource code examples offered during the booklet. as well as the ebook resource code, the CD also will comprise a duplicate of the author-developed Hacker Code Library v1.0. The Hacker Code Library will comprise a number of assault sessions and capabilities that may be applied to quick create defense courses and scripts. those periods and capabilities will simplify make the most and vulnerability instrument improvement to an quantity by no means sooner than attainable with publicly on hand software.

* presents readers with operating code to enhance and adjust the commonest defense instruments together with Nmap and Nessus
* discover ways to opposite engineer and write exploits for varied working structures, databases, and applications
* Automate reporting and research of safeguard log documents

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Extra resources for Writing Security Tools and Exploits

Example text

The first choice is usually to try the execve code to see if it works for that particular server. If that server duplicated the socket descriptors to stdout and stdin, small execve shellcode will work fine. This section explores different shellcode methodologies that apply to remote vulnerabilities. This allows an attacker to create a server on the exploited host that executes a shell when connected to. By far the most primitive technique, this is easy to implement in shellcode. 9. sin_port = htons(12345); bind(sockfd, (struct sockaddr *)&sin, sizeof(sin)); 33 34 Chapter 2 • Assembly and Shellcode 9 10 11 12 13 14 listen(sockfd, 5); new = accept(sockfd, NULL, 0); for(i = 2; i >= 0; i--) dup2(new, i); execl("/bin/sh", "sh", NULL); } The security research group, Last Stage of Delirium, wrote some clean port-binding shellcode for Linux, which does not contain Null characters.

If the host being exploited has a firewall with a default deny policy, the attacker will be unable to connect to the shell. Socket Descriptor Reuse Shellcode When choosing shellcode for an exploit, you should always assume that a firewall with a default deny policy will be in place. In this case, port-binding shellcode is not usually the best choice. A better tactic is to recycle the current socket descriptor and utilize that socket instead of creating a new one. In essence, the shellcode iterates through the descriptor table, looking for the correct socket.

After an overview of the Assembly programming language, this chapter looks at two common shellcode problems: addressing and Null-byte. It concludes with examples of writing both remote and local shellcode for the 32-bit Intel Architecture (IA32) platform (also referred to as x86). Thus, the shellcode might be embedded with the rest of the payload in the first request, while triggering its execution using the second request). The length of the shellcode is also important, because the program buffers used to store shellcode are often small; every byte of shellcode counts.

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Writing Security Tools and Exploits by James C. Foster, Vincent T. Liu


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