Debian DLA-3533-1 : lxc - 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-3533. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(179935);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/17");

  script_cve_id("CVE-2022-47952");

  script_name(english:"Debian DLA-3533-1 : lxc - 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-3533
advisory.

  - lxc-user-nic in lxc through 5.0.1 is installed setuid root, and may allow local users to infer whether any
    file exists, even within a protected directory tree, because Failed to open often indicates that a file
    does not exist, whereas does not refer to a network namespace path often indicates that a file exists.
    NOTE: this is different from CVE-2018-6556 because the CVE-2018-6556 fix design was based on the premise
    that we will report back to the user that the open() failed but the user has no way of knowing why it
    failed; however, in many realistic cases, there are no plausible reasons for failing except that the file
    does not exist. (CVE-2022-47952)

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/lxc");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/lts/security/2023/dla-3533");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2022-47952");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/lxc");
  script_set_attribute(attribute:"solution", value:
"Upgrade the lxc packages.

For Debian 10 buster, this problem has been fixed in version 1");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:P/I:N/A:N");
  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:L/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-47952");

  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:"2023/01/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblxc1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpam-cgfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lxc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lxc-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lxc-tests");
  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': 'liblxc1', 'reference': '1:3.1.0+really3.0.3-8+deb10u1'},
    {'release': '10.0', 'prefix': 'libpam-cgfs', 'reference': '1:3.1.0+really3.0.3-8+deb10u1'},
    {'release': '10.0', 'prefix': 'lxc', 'reference': '1:3.1.0+really3.0.3-8+deb10u1'},
    {'release': '10.0', 'prefix': 'lxc-dev', 'reference': '1:3.1.0+really3.0.3-8+deb10u1'},
    {'release': '10.0', 'prefix': 'lxc-tests', 'reference': '1:3.1.0+really3.0.3-8+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_NOTE,
    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, 'liblxc1 / libpam-cgfs / lxc / lxc-dev / lxc-tests');
}