Download e-book for kindle: A Bug Hunter's Diary: A Guided Tour Through the Wilds of by Tobias Klein

By Tobias Klein

ISBN-10: 1593273851

ISBN-13: 9781593273859

Probably uncomplicated insects could have drastic effects, permitting attackers to compromise platforms, strengthen neighborhood privileges, and another way wreak havoc on a system.A trojan horse Hunter's Diary follows defense professional Tobias Klein as he tracks down and exploits insects in the various world's most well liked software program, like Apple's iOS, the VLC media participant, internet browsers, or even the Mac OS X kernel. during this distinct account, you'll see how the builders answerable for those flaws patched the bugs—or didn't reply in any respect. As you persist with Klein on his trip, you'll achieve deep technical wisdom and perception into how hackers procedure tough difficulties and event the real joys (and frustrations) of malicious program hunting.

Along the best way you'll find out how to:
• Use field-tested suggestions to discover insects, like deciding on and tracing consumer enter info and opposite engineering
• take advantage of vulnerabilities like NULL pointer dereferences, buffer overflows, and kind conversion flaws
• enhance facts of notion code that verifies the protection flaw
• file insects to owners or 3rd occasion brokers

A malicious program Hunter's Diary is choked with real-world examples of weak code and the customized courses used to discover and attempt insects. no matter if you're searching insects for enjoyable, for revenue, or to make the realm a more secure position, you'll study helpful new abilities via taking a look over the shoulder of a pro trojan horse hunter in action.

"This is among the best infosec books to return out within the final numerous years."
Dino Dai Zovi, details protection Professional

"Give a guy an take advantage of and also you make him a hacker for an afternoon; train a guy to use insects and also you make him a hacker for a lifetime."
Felix 'FX' Lindner

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Additional info for A Bug Hunter's Diary: A Guided Tour Through the Wilds of Software Security

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Issue=64&id=6. 10. r=10942:eaa343de0d06. 11. r=0%3A68f95 e015346. 12. de/books/bhd/. 13. c@5335&format=s&full=0. 14. txt. 2). Under normal circumstances this wouldn’t be a big deal, since the bug affects a user space library, which generally means that at worst it would crash a user space application. But this bug is different from the average user space NULL pointer dereferences, and it’s possible to exploit this vulnerability to execute arbitrary code. The vulnerability affects the FFmpeg multimedia library that is used by many popular software projects, including Google Chrome, VLC media player, MPlayer, and Xine to name just a few.

Step 1: List the IOCTLs of the Kernel There are different ways to generate a list of the IOCTLs of a kernel. In this case, I simply searched the kernel source code for the customary IOCTL macros. Every IOCTL gets its own number, usually created by a macro. Depending on the IOCTL type, the Solaris kernel defines the following macros: _IOR, _IOW, and _IOWR. To list the IOCTLs, I changed to the directory where I unpacked the kernel source code and used the Unix grep command to search the code. ] 26 Chapter 3 _IOWR('i', _IOWR('i', _IOR('i', _IOW('i', _IOW('i', _IOW('i', _IOW('i', _IOW('i', 145, 146, 147, 148, 149, 150, 151, 152, struct sioc_addr req) struct sioc_addr req) struct iftun_req) struct iftun_req) 0) /* Flush Policy */ 0) /* Set Policy */ 0) /* Delete Policy */ 0) /* List Policy */ I now had a list of IOCTL names supported by the Solaris kernel.

So I downloaded the source code1 and started reading the kernel code, focusing on the parts that implement the user-tokernel interfaces, like IOCTLs and system calls. 2 The vulnerability that I found is one of the most interesting I’ve discovered because its cause—an undefined error condition—is unusual for an exploitable vulnerability (compared to the average overflow bugs). 3 I took the following steps to find the vulnerability: • Step 1: List the IOCTLs of the kernel. • Step 2: Identify the input data.

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A Bug Hunter's Diary: A Guided Tour Through the Wilds of Software Security by Tobias Klein

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