Linux Distros Unpatched Vulnerability : CVE-2026-76878

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

include('compat.inc');

if (description)
{
  script_id(338265);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/20");

  script_cve_id("CVE-2026-76878");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-76878");

  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.

  - In OpenStack Aodh before 22.0.1, the alarm list API bypasses project scoping when the all_projects query
    parameter is set to false. The API checks for the presence of the all_projects key rather than its value;
    a true value enforces the administrator-only policy, but a false value removes the key and skips the
    branch that normally restricts results to the caller's project. A non-admin user with the reader role can
    list alarms from all projects, exposing alarm actions containing trust webhook URLs, Heat signal
    endpoints, project IDs, and user IDs. The parameter can also be combined with a foreign project_id to
    target a specific project's alarms. A related concern is that OpenStack Watcher does not apply
    authorization to its webhook trigger endpoint. Any authenticated user who learns an audit's webhook URL,
    for example from this leaked Aodh alarm metadata, can start an EVENT audit and its associated action plan
    regardless of their own project or role. The webhook endpoint has lacked policy enforcement since its
    introduction in the Ussuri release (Watcher 4.0.0). (CVE-2026-76878)

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-2026-76878");
  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:S/C:P/I:N/A:N");
  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:L/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:H/SA:L");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-76878");

  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:"2026/08/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  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:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:aodh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:watcher");
  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-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14");

  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-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "aodh-api"},
          {"reference": "aodh-common"},
          {"reference": "aodh-doc"},
          {"reference": "aodh-evaluator"},
          {"reference": "aodh-expirer"},
          {"reference": "aodh-listener"},
          {"reference": "aodh-notifier"},
          {"reference": "python3-aodh"},
          {"reference": "python3-watcher"},
          {"reference": "watcher-api"},
          {"reference": "watcher-applier"},
          {"reference": "watcher-common"},
          {"reference": "watcher-decision-engine"},
          {"reference": "watcher-doc"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "aodh-api"},
          {"reference": "aodh-common"},
          {"reference": "aodh-doc"},
          {"reference": "aodh-evaluator"},
          {"reference": "aodh-expirer"},
          {"reference": "aodh-listener"},
          {"reference": "aodh-notifier"},
          {"reference": "python3-aodh"},
          {"reference": "python3-watcher"},
          {"reference": "watcher-api"},
          {"reference": "watcher-applier"},
          {"reference": "watcher-common"},
          {"reference": "watcher-decision-engine"},
          {"reference": "watcher-doc"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "aodh-api"},
          {"reference": "aodh-common"},
          {"reference": "aodh-doc"},
          {"reference": "aodh-evaluator"},
          {"reference": "aodh-expirer"},
          {"reference": "aodh-listener"},
          {"reference": "aodh-notifier"},
          {"reference": "python3-aodh"},
          {"reference": "python3-watcher"},
          {"reference": "watcher-api"},
          {"reference": "watcher-applier"},
          {"reference": "watcher-common"},
          {"reference": "watcher-decision-engine"},
          {"reference": "watcher-doc"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "aodh-api"},
          {"reference": "aodh-common"},
          {"reference": "aodh-doc"},
          {"reference": "aodh-evaluator"},
          {"reference": "aodh-expirer"},
          {"reference": "aodh-listener"},
          {"reference": "aodh-notifier"},
          {"reference": "python3-aodh"},
          {"reference": "python3-watcher"},
          {"reference": "watcher-api"},
          {"reference": "watcher-applier"},
          {"reference": "watcher-common"},
          {"reference": "watcher-decision-engine"},
          {"reference": "watcher-doc"}
        ]
      }
    ]
  }
};

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');
}