Tenable Nessus <= 10.8.4 Multiple Vulnerabilities (TNS-2025-13)

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

include('compat.inc');

if (description)
{
  script_id(241370);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/24");

  script_cve_id("CVE-2025-6021", "CVE-2025-24855");
  script_xref(name:"IAVA", value:"2025-A-0436-S");

  script_name(english:"Tenable Nessus <= 10.8.4 Multiple Vulnerabilities (TNS-2025-13)");

  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 is prior or equal to 10.8.4. It
is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2025-13 advisory.

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations
    can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of
    service when processing crafted input. (CVE-2025-6021)

  - numbers.c in libxslt before 1.1.43 has a use-after-free because, in nested XPath evaluations, an XPath
    context node can be modified but never restored. This is related to xsltNumberFormatGetValue,
    xsltEvalXPathPredicate, xsltEvalXPathStringNs, and xsltComputeSortResultInternal. (CVE-2025-24855)

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/2025.htm#10.8.5");
  script_set_attribute(attribute:"see_also", value:"https://www.tenable.com/security/TNS-2025-13");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Tenable Nessus 10.9.0 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-6021");

  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:"2025/03/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/04");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:tenable:nessus");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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) 2025-2026 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('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Tenable Nessus', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints' : [
        { 'fixed_version' : '10.8.5', 'fixed_display' : '10.8.5 / 10.9.0' }
      ]
    }
  ]
};

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