Mozilla Firefox ESR < 115.39

#%NASL_MIN_LEVEL 80900
## 
# (C) Tenable, Inc.
#                                  
# The descriptive text and package checks in this plugin were
# extracted from Mozilla Foundation Security Advisory mfsa2026-75.
# The text itself is copyright (C) Mozilla Foundation.
##

include('compat.inc');

if (description)
{
  script_id(337626);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/24");

  script_cve_id(
    "CVE-2026-74934",
    "CVE-2026-74935",
    "CVE-2026-74939",
    "CVE-2026-74940",
    "CVE-2026-74942",
    "CVE-2026-74943",
    "CVE-2026-74945",
    "CVE-2026-74946",
    "CVE-2026-74948",
    "CVE-2026-74969",
    "CVE-2026-74973",
    "CVE-2026-74974",
    "CVE-2026-74990"
  );
  script_xref(name:"IAVA", value:"2026-A-0876");

  script_name(english:"Mozilla Firefox ESR < 115.39");

  script_set_attribute(attribute:"synopsis", value:
"A web browser installed on the remote Windows host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Firefox ESR installed on the remote Windows host is prior to 115.39. It is, therefore, affected by
multiple vulnerabilities as referenced in the mfsa2026-75 advisory.

  - Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox
    153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we
    presume that with enough effort some of these could have been exploited. (CVE-2026-74990)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2026-75/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Mozilla Firefox ESR version 115.39 or later.");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-74943");

  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:"2026/08/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:mozilla:firefox_esr");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

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

  script_dependencies("mozilla_org_installed.nasl");
  script_require_keys("installed_sw/Mozilla Firefox ESR");

  exit(0);
}

include('vdf.inc');

# @tvdl-content-verify-only
var vuln_data = {
  "metadata": {
    "spec_version": "1.0"
  },
  "requires": [
    {
      "scope": "target",
      "match": {
        "os": "windows"
      }
    }
  ],
  "checks": [
    {
      "product": {
        "name": "Mozilla Firefox ESR",
        "type": "app"
      },
      "check_algorithm": "default",
      "constraints": [
        {
          "min_version": "115.0.0",
          "fixed_version": "115.39"
        }
      ]
    }
  ]
};

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