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

By Tobias Klein

Probably easy insects could have drastic outcomes, permitting attackers to compromise structures, strengthen neighborhood privileges, and differently wreak havoc on a system.A computer virus Hunter's Diary follows protection specialist Tobias Klein as he tracks down and exploits insects in a number of the world's preferred software program, like Apple's iOS, the VLC media participant, internet browsers, or even the Mac OS X kernel. during this specific account, you'll see how the builders chargeable 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 process tough difficulties and adventure the real joys (and frustrations) of computer virus hunting.

Along the way in which you'll learn the way to:
• Use field-tested concepts to discover insects, like picking out and tracing consumer enter information and opposite engineering
• make the most vulnerabilities like NULL pointer dereferences, buffer overflows, and kind conversion flaws
• increase evidence of idea code that verifies the protection flaw
• record insects to owners or 3rd social gathering brokers

A trojan horse Hunter's Diary is filled with real-world examples of susceptible code and the customized courses used to discover and try insects. no matter if you're searching insects for enjoyable, for revenue, or to make the area a more secure position, you'll study worthwhile new talents via having a look over the shoulder of a pro malicious program hunter in action.

"This is likely one of the best infosec books to come back out within the final numerous years."
Dino Dai Zovi, info protection Professional

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

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Example text

Figure 3-4 shows a call graph summarizing the relationships of the functions involved in the NULL pointer dereference bug. (1) ip_process_ioctl() (5) (2) ip_extract_tunreq() (4) ipif_lookup_on_name() (3) ip_sioctl_tunparam() (6) NULL Pointer Dereference Figure 3-4: Call graph summarizing the relationships of the functions involved in the NULL pointer dereference bug. The numbers shown refer to the chronological order of events. 2 Exploitation Exploiting this bug was an exciting challenge. NULL pointer dereferences are usually labeled as unexploitable bugs because they can generally be used for a denial-of-service attack but not for arbitrary code execution.

In order to confirm with existing semantics, * and to not break any programs/script relying * on that behaviour, if<0>:0 is considered to be * a valid interface. * * If alias has two or more digits and the first * is zero, fail. */ if (&cp[2] < endp && cp[1] == '0') return (NULL); } In line 19139, the value of error, which holds one of the error conditions, is explicitly set to 0. Error condition 0 means that no error has occurred so far. By supplying a colon directly followed by an ASCII zero and an arbitrary digit in the interface name, it is possible to trigger the code in line 19176, which leads to a return to the caller function.

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.

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