Microsoft IIS .HTR ISAPI Filter Enabled - Nessus

High Plugin ID: 10932

This page contains detailed information about the Microsoft IIS .HTR ISAPI Filter Enabled 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: 10932
Name: Microsoft IIS .HTR ISAPI Filter Enabled
Filename: iis_htr_isapi.nasl
Vulnerability Published: 2002-04-10
This Plugin Published: 2002-04-10
Last Modification Time: 2022-04-11
Plugin Version: 1.39
Plugin Type: remote
Plugin Family: Web Servers
Dependencies: find_service1.nasl, http_version.nasl, no404.nasl, www_fingerprinting_hmap.nasl

Vulnerability Information

Severity: High
Vulnerability Published: 2002-04-10
Patch Published: N/A
CVE [?]: CVE-2002-0071
CPE [?]: cpe:/a:microsoft:iis

Synopsis

The remote web server is affected by a buffer overflow vulnerability.

Description

The IIS server appears to have the .HTR ISAPI filter mapped.

At least one remote vulnerability has been discovered for the .HTR filter. This is detailed in Microsoft Advisory MS02-018, and gives remote SYSTEM level access to the web server.

It is recommended that, even if you have patched this vulnerability, you unmap the .HTR extension and any other unused ISAPI extensions if they are not required for the operation of your site.

Solution

Apply the patch referenced above.

Public Exploits

Target Network Port(s): 80
Target Asset(s): Services/www
Exploit Available: True (Metasploit Framework)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the Microsoft IIS .HTR ISAPI Filter Enabled vulnerability:

Metasploit: exploit/windows/iis/ms02_018_htr
[MS02-018 Microsoft IIS 4.0 .HTR Path Overflow]

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.

Risk Information

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

CVSS Base Score:	7.5 (High)
Impact Subscore:	6.4
Exploitability Subscore:	10.0
CVSS Temporal Score:	5.5 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.5 (Medium)

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

# Based on Matt Moore's iis_htr_isapi.nasl
#
# Script audit and contributions from Carmichael Security 
#      Erik Anderson <[email protected]>
#      Added BugtraqID and CAN
#
# TODO: internationalisation ?
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(10932);
  script_version("1.39");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2002-0071");
  script_bugtraq_id(4474);
  script_xref(name:"MSFT", value:"MS02-018");
  script_xref(name:"MSKB", value:"319733");

  script_name(english:"Microsoft IIS .HTR ISAPI Filter Enabled");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server is affected by a buffer overflow vulnerability.");
  script_set_attribute(attribute:"description", value:
"The IIS server appears to have the .HTR ISAPI filter mapped.

At least one remote vulnerability has been discovered for the .HTR
filter. This is detailed in Microsoft Advisory
MS02-018, and gives remote SYSTEM level access to the web server. 

It is recommended that, even if you have patched this vulnerability, 
you unmap the .HTR extension and any other unused ISAPI extensions
if they are not required for the operation of your site.");
  script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2002/ms02-018");
  # https://web.archive.org/web/20060323225644/http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0013.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?071241d5");
  script_set_attribute(attribute:"solution", value:
"Apply the patch referenced above.");
  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:U/RL:OF/RC:C");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"metasploit_name", value:'MS02-018 Microsoft IIS 4.0 .HTR Path Overflow');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2002/04/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2002/04/10");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:iis");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");

  script_copyright(english:"This script is Copyright (C) 2002-2022 Tenable Network Security, Inc.");

  script_dependencies("find_service1.nasl", "no404.nasl", "http_version.nasl", "www_fingerprinting_hmap.nasl");
  script_require_ports("Services/www", 80);

  exit(0);
}

# Check makes a request for NULL.htr

include("global_settings.inc");
include("misc_func.inc");
include("http.inc");

port = get_http_port(default:80, embedded: 0);

banner = get_http_banner(port:port);
if ( "Microsoft-IIS" >!< banner ) exit(0);

w = http_send_recv3(method:"GET", item: "/NULL.htr", port: port);
if (isnull(w)) exit(1, "the web server did not answer");

lookfor = "<html>Error: The requested file could not be found. </html>";
if (lookfor >< w[2])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/iis_htr_isapi.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\iis_htr_isapi.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/iis_htr_isapi.nasl

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How to Run

Here is how to run the Microsoft IIS .HTR ISAPI Filter Enabled 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 Web Servers plugin family.
On the right side table select Microsoft IIS .HTR ISAPI Filter Enabled plugin ID 10932.
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 iis_htr_isapi.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

BID | SecurityFocus Bugtraq ID:

4474

MSKB | Microsoft Knowledge Base:

319733

MSFT | Microsoft Security Bulletin:

MS02-018

See also:

Similar and related Nessus plugins:

11028 - Microsoft IIS .HTR Filter Multiple Overflows (MS02-028)
10943 - MS02-018: Cumulative Patch for Internet Information Services (327696)
108808 - Microsoft IIS 7.0 Vulnerabilities (uncredentialed) (PCI/DSS)
10492 - MS00-006: Microsoft IIS IDA/IDQ Multiple Vulnerabilities (uncredentialed check)
10116 - Microsoft IIS ISM.DLL HTR Request Remote Overflow
10671 - MS01-026 / MS01-044: Microsoft IIS Remote Command Execution (uncredentialed check)
31648 - Microsoft IIS webhits.dll Hit-Highlighting Authentication Bypass
10685 - Microsoft IIS ISAPI Filter Multiple Vulnerabilities (MS01-044)
10759 - Web Server HTTP Header Internal IP Disclosure
11412 - Microsoft IIS WebDAV ntdll.dll Remote Overflow (MS03-007)
51956 - MS11-004: Vulnerability in Internet Information Services (IIS) FTP Service Could Allow Remote Code Execution (2489256) (uncredentialed check)
59817 - Microsoft IIS 6.0 PHP NTFS Stream Authentication Bypass
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99281 - Microsoft Windows Server 2003 R2 IIS 6.0 WebDAV PROPFIND Request Handling RCE (EXPLODINGCAN)
10357 - Microsoft IIS MDAC RDS (msadcs.dll) Arbitrary Remote Command Execution
11161 - Microsoft Data Access Components RDS Data Stub Remote Overflow
11664 - Microsoft Media Services ISAPI nsiislog.dll Multiple Overflows
153486 - Microsoft Open Management Infrastructure RCE (CVE-2021-38647)
38808 - Microsoft IIS WebDAV Unicode Request Directory Security Bypass
11370 - Microsoft IIS fpcount.exe CGI Remote Overflow
40825 - MS09-053: Microsoft IIS FTPd NLST Command Remote Buffer Overflow (975191) (uncredentialed check)
10657 - MS01-023: Microsoft IIS 5.0 Malformed HTTP Printer Request Header Remote Buffer Overflow (953155) (uncredentialed check)
10564 - Microsoft IIS Phone Book Service /pbserver/pbserver.dll Remote Overflow
34407 - MS08-062: Microsoft IIS IPP Service Unspecified Remote Overflow (953155)
39342 - MS09-020: Vulnerabilities in Internet Information Services (IIS) Could Allow Elevation of Privilege (970483)
49223 - MS10-065: Vulnerabilities in Microsoft Internet Information Services (IIS) Could Allow Remote Code Execution (2267960)
51904 - MS11-004: Vulnerability in Internet Information Services (IIS) FTP Service Could Allow Remote Code Execution (2489256)
62905 - MS12-073: Vulnerabilities in Microsoft Internet Information Services (IIS) Could Allow Information Disclosure (2733829)
79135 - MS14-076: Vulnerability in Internet Information Services (IIS) Could Allow Security Feature Bypass (2982998)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file iis_htr_isapi.nasl version 1.39. For more plugins, visit the Nessus Plugin Library.

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Microsoft IIS .HTR ISAPI Filter Enabled - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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