Disc Soft DAEMON Tools Lite 12.5.0.2421 - 12.5.0.2434 Embedded Malicious Code (CVE-2026-8398)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(323022);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/29");

  script_cve_id("CVE-2026-8398");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2026/05/30");

  script_name(english:"Disc Soft DAEMON Tools Lite 12.5.0.2421 - 12.5.0.2434 Embedded Malicious Code (CVE-2026-8398)");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote Windows host is affected by an embedded malicious code vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Disc Soft DAEMON Tools Lite installed on the remote Windows host is between 12.5.0.2421 and 12.5.0.2434
inclusive. It is, therefore, affected by an embedded malicious code vulnerability.

  - A supply chain attack compromised the official installation packages of DAEMON Tools Lite, distributed from the
    legitimate website daemon-tools.cc between approximately April 8, 2026, and May 5, 2026. Attackers gained
    unauthorized access to the vendor's (AVB Disc Soft) build or distribution infrastructure and trojanized three
    binaries: DTHelper.exe, DiscSoftBusServiceLite.exe, and DTShellHlp.exe. These files were digitally signed with the
    legitimate AVB Disc Soft code-signing certificate, allowing the malicious installers to appear trustworthy and
    bypass signature-based detection. (CVE-2026-8398)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://blog.daemon-tools.cc/post/security-incident");
  script_set_attribute(attribute:"see_also", value:"https://securelist.com/tr/daemon-tools-backdoor/119654/");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2026-8398");
  script_set_attribute(attribute:"solution", value:
"Reinstall DAEMON Tools Lite using a clean package (version 12.6.0.2445 or later) from the official vendor site.");
  script_set_attribute(attribute:"agent", value:"windows");
  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:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:A");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-8398");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:disc-soft:daemon_tools");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("disc_soft_daemon_tools_lite.nbin");
  script_require_keys("installed_sw/Disc Soft DAEMON Tools Lite");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'Disc Soft DAEMON Tools Lite', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '12.5.0.2421', 'max_version': '12.5.0.2434', 'fixed_version': '12.6.0.2445'}
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:result);