Multiple FTPD glob Command Arbitrary Command Execution - Nessus

Critical Plugin ID: 10821

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

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 10821
Name: Multiple FTPD glob Command Arbitrary Command Execution
Filename: ftpglob.nasl
Vulnerability Published: 2001-04-09
This Plugin Published: 2001-12-06
Last Modification Time: 2018-11-15
Plugin Version: 1.56
Plugin Type: remote
Plugin Family: FTP
Dependencies: ftp_anonymous.nasl, ftpserver_detect_type_nd_version.nasl, os_fingerprint.nasl
Required KB Items [?]: Settings/ParanoidReport

Vulnerability Information

Severity: Critical
Vulnerability Published: 2001-04-09
Patch Published: N/A
CVE [?]: CVE-2001-0249, CVE-2001-0550
CPE [?]: N/A
Exploited by Malware: True

Synopsis

The remote ftp server is affected by a remote code execution vulnerability.

Description

The FTPD glob vulnerability manifests itself in handling the glob command. The problem is not a typical buffer overflow or format string vulnerability, but a combination of two bugs - an implementation of the glob command that does not properly return an error condition when interpreting the string 'bracket', and then frees memory which may contain user-supplied data.

An attacker who is able to log in to a vulnerable server, including users with anonymous access, can exploit this to execute arbitrary code with the privileges of the FTP service.

Solution

Contact your vendor for a fix.

Public Exploits

Target Network Port(s): 21
Target Asset(s): Services/ftp
Exploit Available: True (GitHub, Immunity Canvas)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Multiple FTPD glob Command Arbitrary Command Execution vulnerability:

GitHub: https://github.com/Drift-Security/Shadow_Brokers-Vs-NSA
[CVE-2001-0550]
GitHub: https://github.com/R3K1NG/ShadowBrokersFiles
[CVE-2001-0550]
GitHub: https://github.com/antiscammerarmy/ShadowBrokersFiles
[CVE-2001-0550]
GitHub: https://github.com/bl4ck4t/Tools
[CVE-2001-0550]
GitHub: https://github.com/cipherreborn/SB--.-HACK-the-EQGRP-1
[CVE-2001-0550]
GitHub: https://github.com/happysmack/x0rzEQGRP
[CVE-2001-0550]
GitHub: https://github.com/kongjiexi/leaked2
[CVE-2001-0550]
GitHub: https://github.com/maxcvnd/bdhglopoj
[CVE-2001-0550]
GitHub: https://github.com/mudongliang/LinuxFlaw/tree/master/CVE-2001-0550
[CVE-2001-0550]
GitHub: https://github.com/r3p3r/x0rz-EQGRP
[CVE-2001-0550]
GitHub: https://github.com/shakenetwork/shadowbrokerstuff
[CVE-2001-0550]
GitHub: https://github.com/thePevertedSpartan/EQ1
[CVE-2001-0550]
GitHub: https://github.com/thetrentusdev/shadowbrokerstuff
[CVE-2001-0550]
GitHub: https://github.com/thetrentus/ShadowBrokersStuff
[CVE-2001-0550]
GitHub: https://github.com/wuvuw/EQGR
[CVE-2001-0550]
GitHub: https://github.com/x0rz/EQGRP
[CVE-2001-0550]
Immunity Canvas: CANVAS

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

CVSS Score Source [?]: CVE-2001-0249
CVSS V2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	8.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.7 (High)

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Plugin Source

#
# This script is copyright  2001 by EMAZE Networks S.p.A.
# under the General Public License (GPL). All Rights Reserved.
#
# changes by rd: added risk factor & fix

# Changes by Tenable:
# - Revised plugin title (1/28/2009)
# - Fixed typos in the description (11/30/2012)
# - update dependencies (7/23/2018)

bracket = raw_string(0x7B);

include("compat.inc");

if (description)
{
  script_id(10821);
  script_version("1.56");
  script_cvs_date("Date: 2018/11/15 20:50:22");

  script_cve_id("CVE-2001-0249", "CVE-2001-0550");
  script_bugtraq_id(2550, 3581);

  script_name(english:"Multiple FTPD glob Command Arbitrary Command Execution");
  script_summary(english:"Check if the remote FTPD is affected by a glob heap corruption vulnerability");

  script_set_attribute(attribute:"synopsis", value:
"The remote ftp server is affected by a remote code execution
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The FTPD glob vulnerability manifests itself in handling the glob
command. The problem is not a typical buffer overflow or format string
vulnerability, but a combination of two bugs - an implementation of
the glob command that does not properly return an error condition when
interpreting the string 'bracket', and then frees memory which may
contain user-supplied data.

An attacker who is able to log in to a vulnerable server, including
users with anonymous access, can exploit this to execute arbitrary
code with the privileges of the FTP service.");
  # https://web.archive.org/web/20040820110551/http://archives.neohapsis.com/archives/vulnwatch/2001-q3/0003.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0332633c");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/2001/Nov/237");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/2001/Nov/258");
  script_set_attribute(attribute:"solution", value:"Contact your vendor for a fix.");
  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:H/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2001-0249");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"vuln_publication_date", value:"2001/04/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2001/12/06");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_end_attributes();

  script_category(ACT_MIXED_ATTACK);
  script_family(english:"FTP");

  script_copyright(english:"Copyright (C) 2001-2018 E*Maze");

  script_dependencie("ftpserver_detect_type_nd_version.nasl", "ftp_anonymous.nasl", "os_fingerprint.nasl");
  script_require_keys("Settings/ParanoidReport");
  script_require_ports("Services/ftp", 21);

  exit(0);
}


include("audit.inc");
include("ftp_func.inc");
include("global_settings.inc");

port = get_ftp_port(default: 21);

if (report_paranoia < 2) audit(AUDIT_PARANOID);

login = get_kb_item("ftp/login");
password = get_kb_item("ftp/password");

if(safe_checks())login = 0;


if (login)
{
	soc = open_sock_tcp(port);
	if (!soc)
		exit(0);

	if (ftp_authenticate(socket:soc, user:login, pass:password))
	{
 		c = string("CWD ~", bracket, "\r\n");
     		d = string("CWD ~*", bracket, "\r\n");

		send(socket:soc, data:c);
     		b = ftp_recv_line(socket:soc);

 		send(socket:soc, data:d);
		e = ftp_recv_line(socket:soc);

		#
		# Buggy version. no known exploits
		#

		buggy =
"You seem to be running an FTP server which is vulnerable to the 'glob
heap corruption' flaw, but which can not be exploited on this server.";



		#
		# Vulnerable version. Working exploit has been written
		#
		vuln =
"You seem to be running an FTP server which is vulnerable to the 'glob
heap corruption' flaw, which is known to be exploitable remotely against
this server. An attacker may use this flaw to execute arbitrary commands
on this host.";


		#
		# Check if the connection is lost
		# if it is, the daemon is vulnerable
		# linux/bsd: wuftpd, beroftpd
		# solaris ftpd
		#

		if ((!b) || (!e))
		{
			security_hole(port:port, extra:vuln);
			exit(0);
		}

		#
		# Freebsd / Openbsd command successful.
		# buggy version
		#
		if ((b >< "250 CWD command successful") ||
		    (e >< "250 CWD command successful"))
		{
		   	security_hole(port:port, extra:buggy);
			exit(0);
		}

		#
		# Netbsd vulnerable
		#
		if((b >< ":") || (e >< ":"))
		{
			security_hole(port:port, extra:vuln);
			exit(0);
		}

		#
		# Aix buggy
		#
		if ((b >< "550 Unknown user name after ~") ||
		    (e >< "550 Unknown user name after ~"))
		{
			security_hole(port:port, extra:buggy);
			exit(0);
		}

		#
		# MacOS X Darwin buggy
		#
		if ((b >< "550 ~: No such file or directory") ||
		    (e >< "550 ~: No such file or directory"))
		{
		   	security_hole(port:port, extra:buggy);
			exit(0);
		}

		#
		# The non vulnerable version
		#
     		ftp_close(socket:soc);

		exit(0);
	}

	ftp_close(socket: soc);
}




os = get_kb_item("Host/OS");
if(os)
{
 if(egrep(pattern:".*FreeBSD (4\.[5-9]|5\..*).*", string:os))exit(0);
}




#
# We weren't able to login into the ftp server.
# check the banner instead
#
banner = get_ftp_banner(port: port);

if (!banner)
	exit(0);

#
# FTP server 4.1 (aix/ultrix), 1.1. (hp-ux), 6.00 (darwin), 6.00LS (freebsd)
#

# wu-ftpd 2.6.1-20 is not vulnerable
if(egrep(pattern:"(wu|wuftpd)-2\.6\.1-[2-9][0-9].*", string:banner))exit(0);


if ( "PHNE_27765" >< banner ||
     "PHNE_29461" >< banner ||
     "PHNE_30432" >< banner ||
     "PHNE_31931" >< banner ||
     "PHNE_34544" >< banner ||
     "PHNE_30990" >< banner ) exit(0);

if (
	egrep(pattern:
		"(wu|wuftpd)-([0-1]|(2\.([0-5][^0-9]|6\.[0-1]))).*",
	string:banner) ||
	egrep(pattern:
		"BeroFTPD.*",
	string:banner) ||
	egrep(pattern:
		"NetBSD-ftpd (199[0-9]|200[0-1]).*",
	string:banner) ||
	egrep(pattern:
		"Digital UNIX Version [0-5]\..*",
	string:banner) ||
	egrep(pattern:
		"SunOS [0-5]\.[0-8].*",
	string:banner) ||
	egrep(pattern:
		"FTP server.*Version (1\.[0-1]\.|4\.1|6\.00|6\.00LS).*",
	string:banner)	||
	egrep(pattern:
		"FTP server .SRPftp 1\.[0-3].*",
	      string:banner))
	{
	banvuln =
"Nessus relied solely on the banner of the server to issue this warning,
so this alert might be a false positive.
A valid username/password is needed to fully check this vulnerability";
	security_hole(port:port, extra:banvuln);
	exit(0);
}

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

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

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How to Run

Here is how to run the Multiple FTPD glob Command Arbitrary Command Execution as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select FTP plugin family.
On the right side table select Multiple FTPD glob Command Arbitrary Command Execution plugin ID 10821.
Specify the target on the Settings tab and click to Save the scan.
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 ftpglob.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

BID | SecurityFocus Bugtraq ID:

2550, 3581

See also:

Similar and related Nessus plugins:

14924 - Debian DSA-087-1 : wu-ftpd - remote root exploit
13903 - Mandrake Linux Security Advisory : wu-ftpd (MDKSA-2001:090)
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44937 - Multiple Adobe Products XML External Entity (XXE) Injection (APSB10-05)
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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ftpglob.nasl version 1.56. For more plugins, visit the Nessus Plugin Library.

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Multiple FTPD glob Command Arbitrary Command Execution - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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