GLSA-202305-19 : Firejail: Local Privilege Escalation

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# @NOAGENT@
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 202305-19.
#
# 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(175060);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/05/03");

  script_cve_id("CVE-2022-31214");

  script_name(english:"GLSA-202305-19 : Firejail: Local Privilege Escalation");

  script_set_attribute(attribute:"synopsis", value:
"");
  script_set_attribute(attribute:"description", value:
"The remote host is affected by the vulnerability described in GLSA-202305-19 (Firejail: Local Privilege Escalation)

  - A Privilege Context Switching issue was discovered in join.c in Firejail 0.9.68. By crafting a bogus
    Firejail container that is accepted by the Firejail setuid-root program as a join target, a local attacker
    can enter an environment in which the Linux user namespace is still the initial user namespace, the
    NO_NEW_PRIVS prctl is not activated, and the entered mount namespace is under the attacker's control. In
    this way, the filesystem layout can be adjusted to gain root privileges through execution of available
    setuid-root binaries such as su or sudo. (CVE-2022-31214)

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.gentoo.org/glsa/202305-19");
  script_set_attribute(attribute:"see_also", value:"https://bugs.gentoo.org/show_bug.cgi?id=850748");
  script_set_attribute(attribute:"solution", value:
"Gentoo has discontinued support for sys-apps/firejail-lts. Users should unmerge it in favor of sys-apps/firejail:

          # emerge --ask --depclean --verbose sys-apps/firejail-lts
          # emerge --ask --verbose sys-apps/firejail
        
All Firejail users should upgrade to the latest version:

          # emerge --ask --oneshot --verbose >=sys-apps/firejail-0.9.70");
  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: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-2022-31214");

  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:"2022/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/05/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/05/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:firejail");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Gentoo 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/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}
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);

var flag = 0;

var packages = [
  {
    'name' : 'sys-apps/firejail',
    'unaffected' : make_list("ge 0.9.70"),
    'vulnerable' : make_list("lt 0.9.70")
  }
];

foreach var package( packages ) {
  if (isnull(package['unaffected'])) package['unaffected'] = make_list();
  if (isnull(package['vulnerable'])) package['vulnerable'] = make_list();
  if (qpkg_check(package: package['name'] , unaffected: package['unaffected'], vulnerable: package['vulnerable'])) flag++;
}


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : qpkg_report_get()
  );
  exit(0);
}
else
{
  qpkg_tests = list_uniq(qpkg_tests);
  var tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Firejail');
}