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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-4015-1.NASL
HistoryJun 12, 2019 - 12:00 a.m.

Ubuntu 16.04 LTS / 18.04 LTS : DBus vulnerability (USN-4015-1)

2019-06-1200:00:00
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

Joe Vennix discovered that DBus incorrectly handled DBUS_COOKIE_SHA1 authentication. A local attacker could possibly use this issue to bypass authentication and connect to DBus servers with elevated privileges.

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-4015-1. 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(125852);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id("CVE-2019-12749");
  script_xref(name:"USN", value:"4015-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : DBus vulnerability (USN-4015-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"Joe Vennix discovered that DBus incorrectly handled DBUS_COOKIE_SHA1
authentication. A local attacker could possibly use this issue to
bypass authentication and connect to DBus servers with elevated
privileges.

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-4015-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/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:H/I:H/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-2019-12749");

  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:"2019/06/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/06/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/06/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dbus");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dbus-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dbus-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dbus-user-session");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dbus-x11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libdbus-1-3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libdbus-1-3-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libdbus-1-dev");
  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': 'dbus', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '16.04', 'pkgname': 'dbus-tests', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '16.04', 'pkgname': 'dbus-udeb', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '16.04', 'pkgname': 'dbus-user-session', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '16.04', 'pkgname': 'dbus-x11', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '16.04', 'pkgname': 'libdbus-1-3', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '16.04', 'pkgname': 'libdbus-1-3-udeb', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '16.04', 'pkgname': 'libdbus-1-dev', 'pkgver': '1.10.6-1ubuntu3.4'},
    {'osver': '18.04', 'pkgname': 'dbus', 'pkgver': '1.12.2-1ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'dbus-tests', 'pkgver': '1.12.2-1ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'dbus-udeb', 'pkgver': '1.12.2-1ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'dbus-user-session', 'pkgver': '1.12.2-1ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'dbus-x11', 'pkgver': '1.12.2-1ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libdbus-1-3', 'pkgver': '1.12.2-1ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libdbus-1-3-udeb', 'pkgver': '1.12.2-1ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libdbus-1-dev', 'pkgver': '1.12.2-1ubuntu1.1'}
];

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_NOTE,
    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, 'dbus / dbus-tests / dbus-udeb / dbus-user-session / dbus-x11 / etc');
}
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