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nessusUbuntu Security Notice (C) 2019-2023 Canonical, Inc. / NASL script (C) 2019-2023 and is owned by Tenable, Inc. or an Affiliate thereof.UBUNTU_USN-4053-1.NASL
HistoryJul 10, 2019 - 12:00 a.m.

Ubuntu 16.04 LTS / 18.04 LTS : GVfs vulnerabilities (USN-4053-1)

2019-07-1000:00:00
Ubuntu Security Notice (C) 2019-2023 Canonical, Inc. / NASL script (C) 2019-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
8

It was discovered that GVfs incorrectly handled the admin backend.
Files created or moved by the admin backend could end up with the wrong ownership information, contrary to expectations. This issue only affected Ubuntu 18.04 LTS, Ubuntu 18.10, and Ubuntu 19.04.
(CVE-2019-12447, CVE-2019-12448, CVE-2019-12449)

It was discovered that GVfs incorrectly handled authentication on its private D-Bus socket. A local attacker could possibly connect to this socket and issue D-Bus calls. (CVE-2019-12795).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4053-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(126598);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/21");

  script_cve_id(
    "CVE-2019-12447",
    "CVE-2019-12448",
    "CVE-2019-12449",
    "CVE-2019-12795"
  );
  script_xref(name:"USN", value:"4053-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : GVfs vulnerabilities (USN-4053-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"It was discovered that GVfs incorrectly handled the admin backend.
Files created or moved by the admin backend could end up with the
wrong ownership information, contrary to expectations. This issue only
affected Ubuntu 18.04 LTS, Ubuntu 18.10, and Ubuntu 19.04.
(CVE-2019-12447, CVE-2019-12448, CVE-2019-12449)

It was discovered that GVfs incorrectly handled authentication on its
private D-Bus socket. A local attacker could possibly connect to this
socket and issue D-Bus calls. (CVE-2019-12795).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-4053-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:N/AC:H/PR:N/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-2019-12448");

  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:"2019/05/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/07/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-backends");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-daemons");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-fuse");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-libs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2019-2023 Canonical, Inc. / NASL script (C) 2019-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/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);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '16.04', 'pkgname': 'gvfs', 'pkgver': '1.28.2-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.28.2-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'gvfs-bin', 'pkgver': '1.28.2-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'gvfs-common', 'pkgver': '1.28.2-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.28.2-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.28.2-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.28.2-1ubuntu1~16.04.3'},
    {'osver': '18.04', 'pkgname': 'gvfs', 'pkgver': '1.36.1-0ubuntu1.3.3'},
    {'osver': '18.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.36.1-0ubuntu1.3.3'},
    {'osver': '18.04', 'pkgname': 'gvfs-bin', 'pkgver': '1.36.1-0ubuntu1.3.3'},
    {'osver': '18.04', 'pkgname': 'gvfs-common', 'pkgver': '1.36.1-0ubuntu1.3.3'},
    {'osver': '18.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.36.1-0ubuntu1.3.3'},
    {'osver': '18.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.36.1-0ubuntu1.3.3'},
    {'osver': '18.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.36.1-0ubuntu1.3.3'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'gvfs / gvfs-backends / gvfs-bin / gvfs-common / gvfs-daemons / etc');
}