Tenable Nessus < 10.10.2 / 10.11.0 < 10.11.2 Multiple Vulnerabilities (TNS-2026-04)

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

include('compat.inc');

if (description)
{
  script_id(298226);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/12");

  script_cve_id("CVE-2026-24515", "CVE-2026-25210");

  script_name(english:"Tenable Nessus < 10.10.2 / 10.11.0 < 10.11.2 Multiple Vulnerabilities (TNS-2026-04)");

  script_set_attribute(attribute:"synopsis", value:
"An instance of Nessus installed on the remote system is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the Tenable Nessus application running on the remote host prior to 10.10.2, 
10.11.0 prior to 10.11.2. It is, therefore, affected by multiple vulnerabilities as referenced in the 
TNS-2026-04 advisory.

  - In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.
    (CVE-2026-24515)

  - In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize
    because there is no integer overflow check for tag buffer reallocation. (CVE-2026-25210)

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://docs.tenable.com/release-notes/Content/nessus/nessus.htm");
  script_set_attribute(attribute:"see_also", value:"https://www.tenable.com/security/TNS-2026-04");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Tenable Nessus 10.10.2, 10.11.2 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:S/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:H/PR:L/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:"manual");
  script_set_attribute(attribute:"cvss3_score_source", value:"manual");
  script_set_attribute(attribute:"cvss_score_rationale", value:"Tenable vendor advisory score.");
  script_set_attribute(attribute:"cvss3_score_rationale", value:"Tenable vendor advisory score.");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_severity", value:"High");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/06");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:tenable:nessus");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  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("nessus_detect.nasl", "nessus_installed_win.nbin", "nessus_installed_linux.nbin", "macos_nessus_installed.nbin");
  script_require_keys("installed_sw/Tenable Nessus");

  exit(0);
}

include('vcf.inc');
include('vcf_extras.inc');

var app_info = vcf::combined_get_app_info(app:'Tenable Nessus');

vcf::check_granularity(app_info:app_info, sig_segments:3);

var constraints = [
  { 'min_version' : '0.0.0', 'fixed_version' : '10.10.2' },
  { 'min_version' : '10.11.0', 'fixed_version' : '10.11.2' }
];

vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_HOLE
);