GLSA-202101-21 : Flatpak: Sandbox escape

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 202101-21.
#
# The advisory text is Copyright (C) 2001-2021 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(145369);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/29");

  script_cve_id("CVE-2021-21261");
  script_xref(name:"GLSA", value:"202101-21");

  script_name(english:"GLSA-202101-21 : Flatpak: Sandbox escape");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis",
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description",
    value:
"The remote host is affected by the vulnerability described in GLSA-202101-21
(Flatpak: Sandbox escape)

    A bug was discovered in the flatpak-portal service that can allow
      sandboxed applications to execute arbitrary code on the host system (a
      sandbox escape).
  
Impact :

    A remote attacker could entice a user to open a specially crafted
      Flatpak app possibly resulting in execution of arbitrary code with the
      privileges of the process or a Denial of Service condition.
  
Workaround :

    As a workaround, this vulnerability can be mitigated by preventing the
      flatpak-portal service from starting, but that mitigation will prevent
      many Flatpak apps from working correctly. It is highly recommended to
      upgrade."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/202101-21"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"All Flatpak users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=sys-apps/flatpak-1.10.0'"
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  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:C/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-2021-21261");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:flatpak");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/01/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/01/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/01/25");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"sys-apps/flatpak", unaffected:make_list("ge 1.10.0"), vulnerable:make_list("lt 1.10.0"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "Flatpak");
}