Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities (USN-3362-1)

2017-07-25T00:00:00
ID UBUNTU_USN-3362-1.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2019-12-02T00:00:00

Description

It was discovered that the X.Org X server incorrectly handled endianness conversion of certain X events. An attacker able to connect to an X server, either locally or remotely, could use this issue to crash the server, or possibly execute arbitrary code as an administrator. (CVE-2017-10971)

It was discovered that the X.Org X server incorrectly handled endianness conversion of certain X events. An attacker able to connect to an X server, either locally or remotely, could use this issue to possibly obtain sensitive information. (CVE-2017-10972)

Eric Sesterhenn discovered that the X.Org X server incorrectly compared MIT cookies. An attacker could possibly use this issue to perform a timing attack and recover the MIT cookie. (CVE-2017-2624).

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-3362-1. 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(101949);
  script_version("3.9");
  script_cvs_date("Date: 2019/09/18 12:31:47");

  script_cve_id("CVE-2017-10971", "CVE-2017-10972", "CVE-2017-2624");
  script_xref(name:"USN", value:"3362-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities (USN-3362-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"It was discovered that the X.Org X server incorrectly handled
endianness conversion of certain X events. An attacker able to connect
to an X server, either locally or remotely, could use this issue to
crash the server, or possibly execute arbitrary code as an
administrator. (CVE-2017-10971)

It was discovered that the X.Org X server incorrectly handled
endianness conversion of certain X events. An attacker able to connect
to an X server, either locally or remotely, could use this issue to
possibly obtain sensitive information. (CVE-2017-10972)

Eric Sesterhenn discovered that the X.Org X server incorrectly
compared MIT cookies. An attacker could possibly use this issue to
perform a timing attack and recover the MIT cookie. (CVE-2017-2624).

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://usn.ubuntu.com/3362-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Update the affected xserver-xorg-core, xserver-xorg-core-hwe-16.04 and
/ or xserver-xorg-core-lts-xenial packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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: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:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core-lts-xenial");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:17.04");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/07/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/07/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/25");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(14\.04|16\.04|17\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 14.04 / 16.04 / 17.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"14.04", pkgname:"xserver-xorg-core", pkgver:"2:1.15.1-0ubuntu2.9")) flag++;
if (ubuntu_check(osver:"14.04", pkgname:"xserver-xorg-core-lts-xenial", pkgver:"2:1.18.3-1ubuntu2.3~trusty2")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"xserver-xorg-core", pkgver:"2:1.18.4-0ubuntu0.3")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"xserver-xorg-core-hwe-16.04", pkgver:"2:1.18.4-1ubuntu6.1~16.04.2")) flag++;
if (ubuntu_check(osver:"17.04", pkgname:"xserver-xorg-core", pkgver:"2:1.19.3-1ubuntu1.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xserver-xorg-core / xserver-xorg-core-hwe-16.04 / etc");
}