Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Mbed TLS vulnerabilities (USN-8123-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8123-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(304014);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/27");

  script_cve_id(
    "CVE-2021-44732",
    "CVE-2024-23775",
    "CVE-2025-27810",
    "CVE-2025-47917",
    "CVE-2025-48965",
    "CVE-2025-52496",
    "CVE-2025-52497"
  );
  script_xref(name:"USN", value:"8123-1");

  script_name(english:"Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Mbed TLS vulnerabilities (USN-8123-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS host has packages installed that are affected by
multiple vulnerabilities as referenced in the USN-8123-1 advisory.

    It was discovered that Mbed TLS incorrectly handled memory allocation failures. A remote attacker could
    possibly use this issue to crash the program. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04
    LTS. (CVE-2021-44732)

    Jonathan Winzig discovered that Mbed TLS incorrectly handled crafted inputs. A remote attacker could
    possibly use this issue to crash the program, resulting in a denial of service. This issue only affected
    Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS. (CVE-2024-23775)

    It was discovered that Mbed TLS incorrectly handled the TLS handshake. A remote attacker could possibly
    use this issue to break the security guarantees of the TLS handshake. (CVE-2025-27810)

    Linh Le and Ngan Nguyen discovered that Mbed TLS incorrectly documented the behavior of a function.
    Application code relying on the documented behavior might be affected. A remote attacker could possibly
    use this issue to execute arbitrary code. (CVE-2025-47917)

    Linh Le and Ngan Nguyen discovered that Mbed TLS incorrectly handled crafted input. A remote attacker
    could possibly use this issue to crash the program, resulting in a denial of service. (CVE-2025-48965)

    It was discovered that Mbed TLS incorrectly handled a race condition. An attacker could possibly use this
    issue to extract AES keys. (CVE-2025-52496)

    Linh Le and Ngan Nguyen discovered that Mbed TLS incorrectly handled certain invalid input. A remote
    attacker could possibly use this issue to crash the program, resulting in a denial of service.
    (CVE-2025-52497)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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://ubuntu.com/security/notices/USN-8123-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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:POC/RL:OF/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-44732");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2025-47917");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/12/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:"p-cpe:/a:canonical:ubuntu_linux:libmbedcrypto1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedcrypto3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedcrypto7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedcrypto7t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedtls-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedtls10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedtls12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedtls14");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedtls14t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedx509-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedx509-1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmbedx509-1t64");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04 / 20.04 / 22.04 / 24.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);
var ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '18.04', 'pkgname': 'libmbedcrypto1', 'pkgver': '2.8.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '18.04', 'pkgname': 'libmbedtls-dev', 'pkgver': '2.8.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '18.04', 'pkgname': 'libmbedtls10', 'pkgver': '2.8.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '18.04', 'pkgname': 'libmbedx509-0', 'pkgver': '2.8.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '20.04', 'pkgname': 'libmbedcrypto3', 'pkgver': '2.16.4-1ubuntu2+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '20.04', 'pkgname': 'libmbedtls-dev', 'pkgver': '2.16.4-1ubuntu2+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '20.04', 'pkgname': 'libmbedtls12', 'pkgver': '2.16.4-1ubuntu2+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '20.04', 'pkgname': 'libmbedx509-0', 'pkgver': '2.16.4-1ubuntu2+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-44732', 'CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '22.04', 'pkgname': 'libmbedcrypto7', 'pkgver': '2.28.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '22.04', 'pkgname': 'libmbedtls-dev', 'pkgver': '2.28.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '22.04', 'pkgname': 'libmbedtls14', 'pkgver': '2.28.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '22.04', 'pkgname': 'libmbedx509-1', 'pkgver': '2.28.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-23775', 'CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '24.04', 'pkgname': 'libmbedcrypto7t64', 'pkgver': '2.28.8-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '24.04', 'pkgname': 'libmbedtls-dev', 'pkgver': '2.28.8-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '24.04', 'pkgname': 'libmbedtls14t64', 'pkgver': '2.28.8-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']},
    {'osver': '24.04', 'pkgname': 'libmbedx509-1t64', 'pkgver': '2.28.8-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2025-27810', 'CVE-2025-47917', 'CVE-2025-48965', 'CVE-2025-52496', 'CVE-2025-52497']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libmbedcrypto1 / libmbedcrypto3 / libmbedcrypto7 / etc');
}