Debian dla-4320 : u-boot - 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-4320. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(266339);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/01");

  script_cve_id("CVE-2021-27097", "CVE-2021-27138");

  script_name(english:"Debian dla-4320 : u-boot - 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-4320 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4320-1                [email protected]
    https://www.debian.org/lts/security/                       Daniel Leidert
    October 01, 2025                              https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : u-boot
    Version        : 2021.01+dfsg-5+deb11u2
    CVE ID         : CVE-2021-27097 CVE-2021-27138
    Debian Bug     : 983269 983270

    Multiple vulnerabilties were discovered in u-boot, a boot loader for
    embedded systems.

    CVE-2021-27097

       Strange modifications of the FIT can introduce security risks.

    CVE-2021-27138

       Using unit addresses in a FIT can pose security risks.

    For Debian 11 bullseye, these problems have been fixed in version
    2021.01+dfsg-5+deb11u2.

    We recommend that you upgrade your u-boot packages.

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

    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
    Attachment:
    signature.asc
    Description: This is a digitally signed message part

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/u-boot");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-27097");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-27138");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/u-boot");
  script_set_attribute(attribute:"solution", value:
"Upgrade the u-boot packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-27138");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/10/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-amlogic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-exynos");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-imx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-mvebu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-omap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-qcom");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-qemu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-rockchip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-rpi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-sunxi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-tegra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:u-boot-tools");
  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': 'u-boot', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-amlogic', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-exynos', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-imx', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-mvebu', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-omap', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-qcom', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-qemu', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-rockchip', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-rpi', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-sunxi', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-tegra', 'reference': '2021.01+dfsg-5+deb11u2'},
    {'release': '11.0', 'prefix': 'u-boot-tools', 'reference': '2021.01+dfsg-5+deb11u2'}
];

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_WARNING,
    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, 'u-boot / u-boot-amlogic / u-boot-exynos / u-boot-imx / u-boot-mvebu / etc');
}