Debian DLA-3377-1 : systemd - LTS 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-3377. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(173763);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/19");

  script_cve_id("CVE-2023-26604");

  script_name(english:"Debian DLA-3377-1 : systemd - LTS 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-3377
advisory.

  - systemd before 247 does not adequately block local privilege escalation for some Sudo configurations,
    e.g., plausible sudoers files in which the systemctl status command may be executed. Specifically,
    systemd does not set LESSSECURE to 1, and thus other programs may be launched from the less program. This
    presents a substantial security risk when running systemctl from Sudo, because less executes as root when
    the terminal size is too small to show the complete systemctl output. (CVE-2023-26604)

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/source-package/systemd");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/lts/security/2023/dla-3377");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-26604");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/systemd");
  script_set_attribute(attribute:"solution", value:
"Upgrade the systemd packages.

For Debian 10 buster, this problem has been fixed in version 241-7~deb10u9.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/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-2023-26604");

  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:"2023/03/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/03/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/04/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-myhostname");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-mymachines");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-resolve");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-systemd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpam-systemd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsystemd-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsystemd0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libudev-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libudev1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:systemd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:systemd-container");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:systemd-coredump");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:systemd-journal-remote");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:systemd-sysv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:systemd-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:udev");
  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 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': 'libnss-myhostname', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libnss-mymachines', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libnss-resolve', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libnss-systemd', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libpam-systemd', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libsystemd-dev', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libsystemd0', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libudev-dev', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'libudev1', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'systemd', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'systemd-container', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'systemd-coredump', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'systemd-journal-remote', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'systemd-sysv', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'systemd-tests', 'reference': '241-7~deb10u9'},
    {'release': '10.0', 'prefix': 'udev', 'reference': '241-7~deb10u9'}
];

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, 'libnss-myhostname / libnss-mymachines / libnss-resolve / etc');
}