Linux Distros Unpatched Vulnerability : CVE-2021-37577

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

include('compat.inc');

if (description)
{
  script_id(260190);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/30");

  script_cve_id("CVE-2021-37577");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2021-37577");

  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.

  - Bluetooth LE and BR/EDR Secure Connections pairing and Secure Simple Pairing using the Passkey entry
    protocol in Bluetooth Core Specifications 2.1 through 5.3 may permit an unauthenticated man-in-the-middle
    attacker to identify the Passkey used during pairing by reflection of a crafted public key with the same X
    coordinate as the offered public key and by reflection of the authentication evidence of the initiating
    device, potentially permitting this attacker to complete authenticated pairing with the responding device
    using the correct Passkey for the pairing session. This is a related issue to CVE-2020-26558.
    (CVE-2021-37577)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2021-37577");
  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:A/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-37577");

  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:"2024/10/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bluez");
  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) 2025-2026 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/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.04", "Host/OS/Ubuntu Linux-25.10");

  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 = {
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "bluetooth"},
          {"reference": "bluez"},
          {"reference": "bluez-cups"},
          {"reference": "bluez-dbg"},
          {"reference": "bluez-hcidump"},
          {"reference": "bluez-obexd"},
          {"reference": "bluez-tests"},
          {"reference": "libbluetooth-dev"},
          {"reference": "libbluetooth3"},
          {"reference": "libbluetooth3-dbg"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "bluetooth"},
          {"reference": "bluez"},
          {"reference": "bluez-cups"},
          {"reference": "bluez-dbg"},
          {"reference": "bluez-hcidump"},
          {"reference": "bluez-obexd"},
          {"reference": "bluez-tests"},
          {"reference": "libbluetooth-dev"},
          {"reference": "libbluetooth3"},
          {"reference": "libbluetooth3-dbg"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "bluetooth"},
          {"reference": "bluez"},
          {"reference": "bluez-cups"},
          {"reference": "bluez-dbg"},
          {"reference": "bluez-hcidump"},
          {"reference": "bluez-obexd"},
          {"reference": "bluez-tests"},
          {"reference": "libbluetooth-dev"},
          {"reference": "libbluetooth3"},
          {"reference": "libbluetooth3-dbg"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "bluetooth"},
          {"reference": "bluez"},
          {"reference": "bluez-cups"},
          {"reference": "bluez-hcidump"},
          {"reference": "bluez-meshd"},
          {"reference": "bluez-obexd"},
          {"reference": "bluez-tests"},
          {"reference": "libbluetooth-dev"},
          {"reference": "libbluetooth3"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "bluetooth"},
          {"reference": "bluez"},
          {"reference": "bluez-cups"},
          {"reference": "bluez-hcidump"},
          {"reference": "bluez-meshd"},
          {"reference": "bluez-obexd"},
          {"reference": "bluez-source"},
          {"reference": "bluez-test-scripts"},
          {"reference": "bluez-test-tools"},
          {"reference": "libbluetooth-dev"},
          {"reference": "libbluetooth3"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"reference": "bluetooth"},
          {"reference": "bluez"},
          {"reference": "bluez-cups"},
          {"reference": "bluez-hcidump"},
          {"reference": "bluez-meshd"},
          {"reference": "bluez-obexd"},
          {"reference": "bluez-source"},
          {"reference": "bluez-test-scripts"},
          {"reference": "bluez-test-tools"},
          {"reference": "libbluetooth-dev"},
          {"reference": "libbluetooth3"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "bluetooth"},
          {"reference": "bluez"},
          {"reference": "bluez-cups"},
          {"reference": "bluez-hcidump"},
          {"reference": "bluez-meshd"},
          {"reference": "bluez-obexd"},
          {"reference": "bluez-source"},
          {"reference": "bluez-test-scripts"},
          {"reference": "bluez-test-tools"},
          {"reference": "libbluetooth-dev"},
          {"reference": "libbluetooth3"}
        ]
      }
    ]
  }
};

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 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');
}