Debian dla-3263 : libtasn1-6 - 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-3263. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(169736);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/01/22");

  script_cve_id("CVE-2021-46848");

  script_name(english:"Debian dla-3263 : libtasn1-6 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 10 host has packages installed that are affected by a vulnerability as referenced in the dla-3263
advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-3263-1                [email protected]
    https://www.debian.org/lts/security/                           Chris Lamb
    January 09, 2023                              https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libtasn1-6
    Version        : 4.13-3+deb10u1
    CVE ID         : CVE-2021-46848

    It was discovered that there was an off-by-one array size issue in
    libtasn1-6, a library to manage the generic ASN.1 data structure.

    For Debian 10 buster, this problem has been fixed in version
    4.13-3+deb10u1.

    We recommend that you upgrade your libtasn1-6 packages.

    For the detailed security status of libtasn1-6 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/libtasn1-6

    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 this issue 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/CVE-2021-46848");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/libtasn1-6");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/libtasn1-6");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libtasn1-6 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C");
  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:N/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-2021-46848");

  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:"2022/10/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/01/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/01/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libtasn1-6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libtasn1-6-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libtasn1-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libtasn1-doc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  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) 2023-2025 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:"^(10)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 10.0', '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': '10.0', 'prefix': 'libtasn1-6', 'reference': '4.13-3+deb10u1'},
    {'release': '10.0', 'prefix': 'libtasn1-6-dev', 'reference': '4.13-3+deb10u1'},
    {'release': '10.0', 'prefix': 'libtasn1-bin', 'reference': '4.13-3+deb10u1'},
    {'release': '10.0', 'prefix': 'libtasn1-doc', 'reference': '4.13-3+deb10u1'}
];

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, 'libtasn1-6 / libtasn1-6-dev / libtasn1-bin / libtasn1-doc');
}