Ubuntu 16.04 ESM / 18.04 ESM : BusyBox vulnerabilities (USN-6335-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6335-1. 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(180472);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id("CVE-2021-28831", "CVE-2022-48174");
  script_xref(name:"USN", value:"6335-1");

  script_name(english:"Ubuntu 16.04 ESM / 18.04 ESM : BusyBox vulnerabilities (USN-6335-1)");

  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 16.04 ESM / 18.04 ESM host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-6335-1 advisory.

    It was discovered that BusyBox incorrectly handled certain malformed gzip archives. If a user or automated
    system were tricked into processing a specially crafted gzip archive, a remote attacker could use this
    issue to cause BusyBox to crash, resulting in a denial of service, or execute arbitrary code. This issue
    only affected Ubuntu 14.04 LTS. (CVE-2021-28831)

    It was discovered that BusyBox did not properly validate user input when performing certain arithmetic
    operations. If a user or automated system were tricked into processing a specially crafted file, an
    attacker could possibly use this issue to cause BusyBox to crash, resulting in a denial of service, or
    execute arbitrary code. (CVE-2022-48174)

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-6335-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-28831");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-48174");

  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:"2021/03/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/09/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:esm");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:esm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox-initramfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox-syslogd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:udhcpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:udhcpd");
  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) 2023-2024 Canonical, Inc. / NASL script (C) 2023-2024 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 (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', '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': '16.04', 'pkgname': 'busybox', 'pkgver': '1:1.22.0-15ubuntu1.4+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'busybox-initramfs', 'pkgver': '1:1.22.0-15ubuntu1.4+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'busybox-static', 'pkgver': '1:1.22.0-15ubuntu1.4+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'busybox-syslogd', 'pkgver': '1:1.22.0-15ubuntu1.4+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'udhcpc', 'pkgver': '1:1.22.0-15ubuntu1.4+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'udhcpd', 'pkgver': '1:1.22.0-15ubuntu1.4+esm2', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'busybox', 'pkgver': '1:1.27.2-2ubuntu3.4+esm1', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'busybox-initramfs', 'pkgver': '1:1.27.2-2ubuntu3.4+esm1', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'busybox-static', 'pkgver': '1:1.27.2-2ubuntu3.4+esm1', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'busybox-syslogd', 'pkgver': '1:1.27.2-2ubuntu3.4+esm1', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'udhcpc', 'pkgver': '1:1.27.2-2ubuntu3.4+esm1', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'udhcpd', 'pkgver': '1:1.27.2-2ubuntu3.4+esm1', 'ubuntu_pro': TRUE}
];

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'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) {
        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_WARNING,
    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, 'busybox / busybox-initramfs / busybox-static / busybox-syslogd / etc');
}