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

By Tobias Klein

ISBN-10: 1593273851

ISBN-13: 9781593273859

Possible uncomplicated insects may have drastic results, permitting attackers to compromise platforms, increase neighborhood privileges, and in a different way wreak havoc on a system.A malicious program Hunter's Diary follows safeguard professional Tobias Klein as he tracks down and exploits insects in a number of the 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 distinctive account, you'll see how the builders answerable for those flaws patched the bugs—or didn't reply in any respect. As you keep on with Klein on his trip, you'll achieve deep technical wisdom and perception into how hackers procedure tough difficulties and adventure the genuine joys (and frustrations) of trojan horse hunting.

Along the best way you'll find out how to:
• Use field-tested thoughts to discover insects, like opting for and tracing consumer enter facts and opposite engineering
• make the most vulnerabilities like NULL pointer dereferences, buffer overflows, and kind conversion flaws
• boost facts of thought code that verifies the safety flaw
• document insects to proprietors or 3rd get together brokers

A computer virus Hunter's Diary is jam-packed with real-world examples of susceptible code and the customized courses used to discover and try out insects. even if you're searching insects for enjoyable, for revenue, or to make the realm a more secure position, you'll examine helpful new abilities by means of taking a look over the shoulder of a pro malicious program hunter in action.

"This is without doubt one of the best infosec books to come back out within the final numerous years."
Dino Dai Zovi, info safeguard Professional

"Give a guy an make the most and also you make him a hacker for an afternoon; educate a guy to use insects and also you make him a hacker for a lifetime."
Felix 'FX' Lindner

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

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Such a coding style is error-prone and therefore not recommended. The vulnerability described in this chapter is an excellent example of the kind of problem that can arise from such code. System crash Kernel Interface name „:01“ SIOCGTUNPARAM IOCTL request (1) (2) (3) NULL->ipif_ill Figure 3-3: Summary of the results so far. An unprivileged user can force a system crash by triggering a NULL pointer dereference in the Solaris kernel. ] 19161 if (*cp == IPIF_SEPARATOR_CHAR) { 19162 /* 19163 * Reject any non-decimal aliases for logical 19164 * interfaces.

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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