Multiple FTP Server Command Handling Overflow - Nessus

Critical   Plugin ID: 10084

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This page contains detailed information about the Multiple FTP Server Command Handling Overflow Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Plugin Overview

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ID: 10084
Name: Multiple FTP Server Command Handling Overflow
Filename: ftp_overflow.nasl
Vulnerability Published: 1997-07-01
This Plugin Published: 1999-06-22
Last Modification Time: 2018-08-31
Plugin Version: 1.85
Plugin Type: remote
Plugin Family: FTP
Dependencies: ftpserver_detect_type_nd_version.nasl
Required KB Items [?]: ftp/login, ftp/password
Excluded KB Items: global_settings/supplied_logins_only

Vulnerability Information

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Severity: Critical
Vulnerability Published: 1997-07-01
Patch Published: N/A
CVE [?]: CVE-1999-0219, CVE-2000-0870, CVE-2000-0943, CVE-2000-1035, CVE-2000-1194, CVE-2002-0126, CVE-2003-0271, CVE-2005-0634, CVE-2005-1415
CPE [?]: N/A

Synopsis

The remote FTP server is susceptible to buffer overflow attacks.

Description

The remote FTP server closes the connection when a command or argument is too long. This is probably due to a buffer overflow and may allow an attacker to execute arbitrary code on the remote host.

Solution

Upgrade / switch the FTP server software or disable the service if it is not needed.

Public Exploits

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Target Network Port(s): 21
Target Asset(s): Services/ftp
Exploit Available: True (Metasploit Framework, Exploit-DB, Core Impact)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Multiple FTP Server Command Handling Overflow vulnerability:

1. Metasploit: exploit/windows/ftp/globalscapeftp_input
   [GlobalSCAPE Secure FTP Server Input Overflow]
2. Exploit-DB: exploits/windows/remote/16703.rb
   [EDB-16703: GlobalScape Secure FTP Server - Input Overflow (Metasploit)]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

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CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	8.3 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.3 (High)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS Base Score:	9.8 (Critical)
Impact Subscore:	5.9
Exploitability Subscore:	3.9
CVSS Temporal Score:	9.1 (Critical)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	9.1 (Critical)

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Plugin Source

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This is the ftp_overflow.nasl nessus plugin source code. This script is Copyright (C) 1999-2018 and is owned by Tenable, Inc. or an Affiliate thereof.

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

if (NASL_LEVEL < 3000) exit(0);

include("compat.inc");

if(description)
{
 script_id(10084);
 script_version ("1.85");

 script_cve_id(
  "CVE-1999-0219",
  "CVE-2000-0870",
  "CVE-2000-0943",
  "CVE-2000-1035",
  "CVE-2000-1194",
  "CVE-2002-0126",
  "CVE-2003-0271",
  "CVE-2005-0634",
  "CVE-2005-1415"
 );
 script_bugtraq_id(269, 1227, 1675, 1690, 1858, 3884, 7251, 7278, 7307, 12704, 13454);

 script_name(english:"Multiple FTP Server Command Handling Overflow");
 
 script_set_attribute(attribute:"synopsis", value:
"The remote FTP server is susceptible to buffer overflow attacks." );
 script_set_attribute(attribute:"description", value:
"The remote FTP server closes the connection when a command or argument
is too long.  This is probably due to a buffer overflow and may allow
an attacker to execute arbitrary code on the remote host." );
 script_set_attribute(attribute:"solution", value:
"Upgrade / switch the FTP server software or disable the service if 
it is not needed." );
 script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
 script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
 script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
 script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"true");
 script_set_attribute(attribute:"exploit_framework_core", value:"true");
 script_set_attribute(attribute:"metasploit_name", value:'GlobalSCAPE Secure FTP Server Input Overflow');
 script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
 script_set_attribute(attribute:"plugin_publication_date", value: "1999/06/22");
 script_set_attribute(attribute:"vuln_publication_date", value: "1997/07/01");
 script_cvs_date("Date: 2018/08/31 12:25:01");
 script_set_attribute(attribute:"plugin_type", value:"remote");
 script_end_attributes();
 
 summary["english"] = "attempts some buffer overflows";
 script_summary(english:summary["english"]);
 
 script_category(ACT_DESTRUCTIVE_ATTACK);
 
 script_copyright(english: "This script is Copyright (C) 1999-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
 script_family(english:"FTP");
 script_dependencies("ftpserver_detect_type_nd_version.nasl");
 script_require_keys("ftp/login", "ftp/password");
 script_exclude_keys("global_settings/supplied_logins_only");
 script_require_ports("Services/ftp", 21);
 exit(0);
}

#
# The script code starts here
#
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("ftp_func.inc");

if (supplied_logins_only) audit(AUDIT_SUPPLIED_LOGINS_ONLY);

global_var port = get_ftp_port(default: 21);

foreach f (make_list("msftpd", "ncftpd", "fw1ftpd", "vxftpd"))
  if (get_kb_item("ftp/"+port+"/"+f))
    exit(0, "The FTP server on port "+port+" is "+f+".");

function is_vulnerable (value)
{
 if (service_is_dead(port: port) > 0)
 {
   set_kb_item(name:"ftp/overflow", value:TRUE);
   set_kb_item(name:"ftp/"+port+"/overflow", value:TRUE);
   set_kb_item(name:"ftp/"+port+"/overflow_method", value:value);
   security_hole(port);
 }
 exit (0);
}

soc = open_sock_tcp(port);
if (! soc) exit(1, "Connection failed to port "+port+".");

  ftp_debug(str:"custom banner");
  d = ftp_recv_line(socket:soc);
  if(!d){
	close(soc);
	exit(1, "No answer on port "+port+".");
	}
  if(!egrep(pattern:"^220[ -]", string:d))
   {
    # not an FTP server
    close(soc);
    exit(1, "The service on port "+port+" does not look like FTP.");	
   }
 
  if ("Microsoft FTP Service" >< d)
    exit(0, "MS FTP is running on port "+port+".");
 
  req = 'USER ftp\r\n';
  send(socket:soc, data:req);
  d = ftp_recv_line(socket:soc);
  ftp_close(socket:soc);
  if(!d)
  {
   exit(1, "No answer on port "+port+".");	
  }
  
  soc = open_sock_tcp(port);
  if ( ! soc ) exit(1, "Connection failed to port "+port+".");
  d = ftp_recv_line(socket:soc);
  s = ('USER ' + crap(4096) + '\r\n');
  send(socket:soc, data:s);
  d = ftp_recv_line(socket:soc);
  if(!d){
	close (soc);
	is_vulnerable (value:"USER");
	}

   # Let's try to access it with valid credentials now.
   login = get_kb_item("ftp/login");
   password = get_kb_item("ftp/password");

   s = ('USER ' + login + '\r\n');
   send(socket:soc, data:s);
   d = ftp_recv_line(socket:soc);
   # ProFTPD 1.5.2 crashes with more than 12 KB
   s = ('PASS ' + crap(12500) + '\r\n');
   send(socket:soc, data:s);
   d = ftp_recv_line(socket:soc);
   if(!d){
	close (soc);
	is_vulnerable (value:"PASS");
	}

     s = ('PASS ' + password + '\r\n');
     send(socket:soc, data:s);
     d = ftp_recv_line(socket:soc);
     if(!d) exit(1, "No answer from port "+port+".");

     foreach cmd (make_list ('CWD', 'LIST', 'STOR', 'RNTO', 'MKD', 'XMKD', 
     	 'RMD', 'XRMD', 'APPE', 'SIZE', 'RNFR', 'HELP', ''))
     {
       s = (cmd + ' ' + crap(4096) + '\r\n');
       d = ftp_recv_line(socket:soc);
       if (! d)
       {
	close (soc);
	is_vulnerable (value: cmd);
       }
     }
		

   if ( soc )  close(soc);
 

The latest version of this script can be found in these locations depending on your platform:

• Linux / Unix:
  /opt/nessus/lib/nessus/plugins/ftp_overflow.nasl
• Windows:
  C:\ProgramData\Tenable\Nessus\nessus\plugins\ftp_overflow.nasl
• Mac OS X:
  /Library/Nessus/run/lib/nessus/plugins/ftp_overflow.nasl

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How to Run

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Here is how to run the Multiple FTP Server Command Handling Overflow as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

1. Click to start a New Scan.
2. Select Advanced Scan.
3. Navigate to the Plugins tab.
4. On the top right corner click to Disable All plugins.
5. On the left side table select FTP plugin family.
6. On the right side table select Multiple FTP Server Command Handling Overflow plugin ID 10084.
7. Specify the target on the Settings tab and click to Save the scan.
8. Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl ftp_overflow.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ftp_overflow.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - ftp_overflow.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state ftp_overflow.nasl -t <IP/HOST>

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References

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BID | SecurityFocus Bugtraq ID:

• 269, 1227, 1675, 1690, 1858, 3884, 7251, 7278, 7307, 12704, 13454

See also:

• https://www.tenable.com/plugins/nessus/10084
• https://vulners.com/nessus/FTP_OVERFLOW.NASL

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Version

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This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ftp_overflow.nasl version 1.85. For more plugins, visit the Nessus Plugin Library.

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