Linux Distros Unpatched Vulnerability : CVE-2026-92288

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

include('compat.inc');

if (description)
{
  script_id(350010);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/24");

  script_cve_id("CVE-2026-92288");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-92288");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow
    unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify
    the client secret of a public Relying Party. checkEndPointAuthenticationCredentials() skips the secret
    comparison for a Relying Party marked public and still returns the authentication method deduced from the
    request, client_secret_basic or client_secret_post. introspection() rejects a caller only when that method
    is missing or none, so a request carrying a public client_id and an arbitrary or empty secret passes the
    endpoint's authentication check. An attacker who holds an access token and knows the client_id of any
    public Relying Party can confirm the token is active and read its metadata, including scope, audience,
    expiry and the sub claim. The sub claim is computed with the calling Relying Party's user identifier
    attribute, so an attacker can translate a user identifier from one Relying Party to another, defeating
    per-client and pseudonymous identifiers. (CVE-2026-92288)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-92288");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/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:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-92288");

  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_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lemonldap-ng");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "lemonldap-ng"},
          {"reference": "lemonldap-ng-doc"},
          {"reference": "lemonldap-ng-fastcgi-server"},
          {"reference": "lemonldap-ng-handler"},
          {"reference": "lemonldap-ng-uwsgi-app"},
          {"reference": "liblemonldap-ng-common-perl"},
          {"reference": "liblemonldap-ng-handler-perl"},
          {"reference": "liblemonldap-ng-manager-perl"},
          {"reference": "liblemonldap-ng-portal-perl"},
          {"reference": "liblemonldap-ng-ssoaas-apache-client-perl"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "lemonldap-ng"},
          {"reference": "lemonldap-ng-doc"},
          {"reference": "lemonldap-ng-fastcgi-server"},
          {"reference": "lemonldap-ng-handler"},
          {"reference": "lemonldap-ng-uwsgi-app"},
          {"reference": "liblemonldap-ng-common-perl"},
          {"reference": "liblemonldap-ng-handler-perl"},
          {"reference": "liblemonldap-ng-manager-perl"},
          {"reference": "liblemonldap-ng-portal-perl"},
          {"reference": "liblemonldap-ng-ssoaas-apache-client-perl"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}