PuTTY DLL Hijacking Vulnerability - Windows

# SPDX-FileCopyrightText: 2017 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:putty:putty";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.810541");
  script_version("2024-02-15T05:05:40+0000");
  script_tag(name:"last_modification", value:"2024-02-15 05:05:40 +0000 (Thu, 15 Feb 2024)");
  script_tag(name:"creation_date", value:"2017-02-09 14:25:24 +0530 (Thu, 09 Feb 2017)");
  script_tag(name:"cvss_base", value:"4.4");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:M/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-05-01 01:50:00 +0000 (Sun, 01 May 2022)");

  script_cve_id("CVE-2016-6167");

  script_tag(name:"qod_type", value:"registry");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("PuTTY DLL Hijacking Vulnerability - Windows");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("General");
  script_dependencies("gb_putty_portable_detect.nasl");
  script_require_ports(139, 445);
  script_mandatory_keys("putty/detected");

  script_tag(name:"summary", value:"PuTTY is prone to a dll hijacking vulnerability.");

  script_tag(name:"insight", value:"The flaw is due to multiple untrusted search
  path errors.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to execute arbitrary code in the context of the affected application.
  Failed exploit attempts will result in a denial of service condition.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"affected", value:"PuTTY beta 0.67 (Windows installers
  created by Inno Setup for version 0.67) on Windows.");

  script_tag(name:"solution", value:"Upgrade to PuTTY version 0.67 or later
  (MSI format for PuTTY's Windows installer (generated by the WiX toolset)).");

  script_xref(name:"URL", value:"https://packetstormsecurity.com/files/137742");
  script_xref(name:"URL", value:"http://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html");
  script_xref(name:"URL", value:"http://www.chiark.greenend.org.uk/~sgtatham/putty");

  exit(0);
}

include("smb_nt.inc");
include("host_details.inc");
include("version_func.inc");

if( ! infos = get_app_version_and_location( cpe:CPE, exit_no_version:TRUE ) )
  exit( 0 );

version = infos["version"];
location = infos["location"];

os_arch = get_kb_item( "SMB/Windows/Arch" );
if( ! os_arch ) {
  exit( 0 );
}

## Only installer created by Inno Setup are vulnerable and Inno Setup
## creates the following keys.
## http://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html?
if( "x86" >< os_arch ) {
  key = "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\PuTTY_is1";
}

else if( "x64" >< os_arch ) {
  key =  "SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\PuTTY_is1";
}

if( version_is_equal( version:version, test_version:"0.67" ) ) {
  inno_location = registry_get_sz( key:key,item:"Inno Setup: App Path" );
  if( ! inno_location ) {
    exit( 0 );
  }

  report = report_fixed_ver( installed_version:version, fixed_version:"0.67 (MSI format for PuTTY's Windows installer)", install_path:location );
  security_message( data:report, port:0 );
  exit( 0 );
}

exit( 99 );