TigerVNC Remote Code Execution Multiple Vulnerabilities - Windows

# SPDX-FileCopyrightText: 2020 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:tigervnc:tigervnc";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.815880");
  script_version("2025-09-12T05:38:45+0000");
  script_tag(name:"last_modification", value:"2025-09-12 05:38:45 +0000 (Fri, 12 Sep 2025)");
  script_tag(name:"creation_date", value:"2020-01-06 13:24:06 +0530 (Mon, 06 Jan 2020)");
  script_tag(name:"cvss_base", value:"6.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-01-21 22:15:00 +0000 (Tue, 21 Jan 2020)");

  script_cve_id("CVE-2019-15691", "CVE-2019-15692", "CVE-2019-15693", "CVE-2019-15694",
                "CVE-2019-15695");

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

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

  script_name("TigerVNC Remote Code Execution Multiple Vulnerabilities - Windows");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("General");
  script_dependencies("gb_tigervnc_detect_win.nasl");
  script_mandatory_keys("TigerVNC6432/Win/Installed");

  script_tag(name:"summary", value:"TigerVNC is prone to multiple remote code execution (RCE)
  vulnerabilities.");
  script_tag(name:"insight", value:"Multiple flaws are due to:

  - An incorrect usage of stack memory in ZRLEDecoder

  - A heap buffer overflow error in TightDecoder::FilterGradient.

  - An insufficient sanitization of PixelFormat in CMsgReader::readSetCursor.

  - The signdness error in processing MemOutStream in DecodeManager::decodeRect.

  - An incorrect value checks in CopyRectDecoder.");
  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
  script_tag(name:"affected", value:"TigerVNC version prior to 1.10.1");

  script_tag(name:"solution", value:"Upgrade to TigerVNC version 1.10.1 or later.");

  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2019/12/20/2");

  exit(0);
}

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

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

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

if(version_is_less(version: vers, test_version: "1.10.1")) {
  report = report_fixed_ver(installed_version: vers, fixed_version: "1.10.1", install_path: path);
  security_message(port: 0, data: report);
  exit(0);
}

exit(99);