FakeBO NetBus Handling Code Remote Overflow

#
# (C) Tenable Network Security, Inc.
#

# Script audit and contributions from Carmichael Security
#      Erik Anderson <[email protected]> (nb: this domain no longer exists)
#      Added link to the Bugtraq message archive
#


include("compat.inc");


if(description)
{
 script_id(10066);
 script_version ("1.32");

 script_name(english:"FakeBO NetBus Handling Code Remote Overflow");
 script_summary(english:"Overflows FakeBO's buffers");

 script_set_attribute(attribute:"synopsis", value:
"The remote honeypot service has a stack-based buffer overflow
vulnerability." );
 script_set_attribute(attribute:"description", value:
"The remote host appears to be running FakeBO, a service that mimics
backdoors such as Back Orifice and NetBus, monitoring any login
attempts.

The version of FakeBO running on the remote host has a remote stack-
based buffer overflow vulnerability.  A remote attacker could exploit
this to crash the service, or execute arbitrary code." );
 script_set_attribute(
   attribute:"see_also",
   value:"https://seclists.org/bugtraq/1999/Feb/183"
 );
 script_set_attribute(
   attribute:"solution",
   value:"Disable this service."
 );
 script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
 script_set_attribute(attribute:"plugin_publication_date", value: "1999/06/22");
 script_set_attribute(attribute:"vuln_publication_date", value: "1999/02/11");
 script_cvs_date("Date: 2018/11/15 20:50:22");
 script_set_attribute(attribute:"plugin_type", value:"remote");
 script_end_attributes();

 script_category(ACT_MIXED_ATTACK); # mixed
 script_family(english:"Gain a shell remotely");

 script_copyright(english:"This script is Copyright (C) 1999-2018 Tenable Network Security, Inc.");

 script_dependencie("find_service1.nasl");
 script_require_ports("Services/netbus", 12345);

 exit(0);
}

#
# The script code starts here
#

port = get_kb_item("Services/netbus");
if(!port)port = 12345;
if(get_port_state(port))
{
 soc = open_sock_tcp(port);
 if(soc)
 { 
  a = recv_line(socket:soc, length:1024);
  if("NetBus" >< a)
  { 
   if(safe_checks())
   {
    report = string(
      "\n",
      "*** Nessus detected this vulnerability solely by\n",
      "*** looking at the banner of the remote service.\n"
    );
    security_hole(port:port, extra:report);
    exit(0);
   }
   s = crap(5001);
   send(socket:soc, data:s);
   close(soc);
   
   flaw = 0;
   soc2 = open_sock_tcp(port);
   if(!soc2)flaw = 1;
   else
   {
    d = recv(socket:soc2, length:1024);
    if(!d)flaw = 1;
    close(soc2);
   }
   
   if(flaw)security_hole(port);
  }
 }
}