EulerOS 2.0 SP8 : flatpak (EulerOS-SA-2021-2799)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(156294);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/12/25");

  script_cve_id("CVE-2021-41133");

  script_name(english:"EulerOS 2.0 SP8 : flatpak (EulerOS-SA-2021-2799)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the flatpak packages installed, the EulerOS installation on the remote host is affected by
the following vulnerabilities :

  - Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In
    versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used
    by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the
    Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating
    the VFS using recent mount-related syscalls that are not blocked by Flatpak's denylist seccomp filter, in
    order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act
    as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the
    privileges that the corresponding services will believe the Flatpak app has. Note that protocols that
    operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected
    by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by
    the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as
    of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from
    upgrading to a patched version. (CVE-2021-41133)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security
advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional
issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2021-2799
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ece358b1");
  script_set_attribute(attribute:"solution", value:
"Update the affected flatpak packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/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:"cvss_score_source", value:"CVE-2021-41133");

  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:"2021/10/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/12/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/12/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:flatpak");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:flatpak-libs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(8)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) 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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

var flag = 0;

var pkgs = [
  "flatpak-1.0.3-1.h6.eulerosv2r8",
  "flatpak-libs-1.0.3-1.h6.eulerosv2r8"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"8", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "flatpak");
}