serverspec for CVE-2015-0235

CVE_2015_0235_GHOST_spec.rb

require 'spec_helper'
# Check CVE-2015-0235 Ghost
# http://www.openwall.com/lists/oss-security/2015/01/27/9

command = <<EOF
cat > /tmp/GHOST.c << 'SCRIPT'
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#define CANARY "in_the_coal_mine"

struct {
  char buffer[1024];
  char canary[sizeof(CANARY)];
} temp = {  "buffer", CANARY };

int main(void) {
  struct hostent resbuf;
  struct hostent *result;
  int herrno;
  int retval;

  /*** strlen (name) = size_needed - sizeof (*host_addr) - sizeof (*h_addr_ptrs) - 1; ***/
  size_t len = sizeof(temp.buffer) - 16*sizeof(unsigned char) - 2*sizeof(char *) - 1;
  char name[sizeof(temp.buffer)];
  memset(name, '0', len);
  name[len] = '\\0';

  retval = gethostbyname_r(name, &resbuf, temp.buffer, sizeof(temp.buffer), &result, &herrno);

  if (strcmp(temp.canary, CANARY) != 0) {
    puts("vulnerable");
    exit(EXIT_SUCCESS);
  }
  if (retval  =  ERANGE) {
    puts("not vulnerable");
    exit(EXIT_SUCCESS);
  }
  puts("should not happen");
  exit(EXIT_FAILURE);
}
SCRIPT

gcc /tmp/GHOST.c -o /tmp/GHOST

/tmp/GHOST
EOF

describe command(command) do
  its(:exit_status) { should eq 0 }
  its(:stdout) { should eq "not vulnerable\n" }
end