Debian dla-4236 : libmbedcrypto3 - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4236. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(240979);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/06/30");

  script_cve_id(
    "CVE-2021-24119",
    "CVE-2021-36647",
    "CVE-2021-43666",
    "CVE-2021-44732",
    "CVE-2022-46392"
  );

  script_name(english:"Debian dla-4236 : libmbedcrypto3 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4236 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4236-1                [email protected]
    https://www.debian.org/lts/security/                       Andrej Shadura
    June 30, 2025                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : mbedtls
    Version        : 2.16.9-0.1+deb11u1
    CVE ID         : CVE-2021-24119 CVE-2021-36647 CVE-2021-43666 CVE-2021-44732
                     CVE-2022-46392

    Multiple vulnerabilities have been fixed in mbedtls, a lightweight crypto and
    SSL/TLS library.

    CVE-2021-24119

        A side-channel vulnerability in base64 PEM file decoding allows
        system-level (administrator) attackers to obtain information about
        secret RSA keys via a controlled-channel and side-channel attack on
        software running in isolated environments that can be single stepped,
        especially Intel SGX.

    CVE-2021-36647

        Function mbedtls_mpi_exp_mod() in lignum.c in Mbed TLS Mbed TLS all
        versions before 3.0.0, 2.27.0 or 2.16.11 allowed attackers with access
        to precise enough timing and memory access information (typically an
        untrusted operating system attacking a secure enclave such as SGX or
        the TrustZone secure world) to recover the private keys used in RSA.

    CVE-2021-43666

        In the mbedtls_pkcs12_derivation function an input password's length
        is 0 caused a denial of service.

    CVE-2021-44732

        Function mbedtls_ssl_set_session() performed a double free in certain
        out-of-memory conditions.

    CVE-2022-46392

        An adversary with access to precise enough information about memory
        accesses (typically, an untrusted operating system attacking a
        secure enclave) could recover an RSA private key after observing the
        victim performing a single private-key operation, if the window size
        (MBEDTLS_MPI_WINDOW_SIZE) used for the exponentiation is 3 or smaller.

    For Debian 11 bullseye, these problems have been fixed in version
    2.16.9-0.1+deb11u1.

    We recommend that you upgrade your mbedtls packages.

    For the detailed security status of mbedtls please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/mbedtls

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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://security-tracker.debian.org/tracker/source-package/mbedtls");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-24119");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-36647");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-43666");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-44732");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2022-46392");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/mbedtls");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libmbedcrypto3 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:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libmbedcrypto3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libmbedtls-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libmbedtls-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libmbedtls12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libmbedx509-0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'libmbedcrypto3', 'reference': '2.16.9-0.1+deb11u1'},
    {'release': '11.0', 'prefix': 'libmbedtls-dev', 'reference': '2.16.9-0.1+deb11u1'},
    {'release': '11.0', 'prefix': 'libmbedtls-doc', 'reference': '2.16.9-0.1+deb11u1'},
    {'release': '11.0', 'prefix': 'libmbedtls12', 'reference': '2.16.9-0.1+deb11u1'},
    {'release': '11.0', 'prefix': 'libmbedx509-0', 'reference': '2.16.9-0.1+deb11u1'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libmbedcrypto3 / libmbedtls-dev / libmbedtls-doc / libmbedtls12 / etc');
}