Ubuntu 18.10 : Linux kernel vulnerability (USN-3846-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3846-1. 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(119826);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/07/15");

  script_cve_id("CVE-2018-18710");
  script_xref(name:"USN", value:"3846-1");

  script_name(english:"Ubuntu 18.10 : Linux kernel vulnerability (USN-3846-1)");

  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 an integer overflow vulnerability existed in
the CDROM driver of the Linux kernel. A local attacker could use this
to expose sensitive information (kernel memory).

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/3846-1/");
  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:N/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:N/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-2018-18710");

  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:"2018/10/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/12/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.18-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-snapdragon");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.10");
  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) 2018-2024 Canonical, Inc. / NASL script (C) 2018-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


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

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(18\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 18.10", "Ubuntu " + 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);

if (get_one_kb_item("Host/ksplice/kernel-cves"))
{
  rm_kb_item(name:"Host/uptrack-uname-r");
  cve_list = make_list("CVE-2018-18710");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for USN-3846-1");
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

var flag = 0;

if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1005-gcp", pkgver:"4.18.0-1005.6")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1006-kvm", pkgver:"4.18.0-1006.6")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1007-aws", pkgver:"4.18.0-1007.9")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1007-azure", pkgver:"4.18.0-1007.7")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1008-raspi2", pkgver:"4.18.0-1008.10")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-13-generic", pkgver:"4.18.0-13.14")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-13-generic-lpae", pkgver:"4.18.0-13.14")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-13-lowlatency", pkgver:"4.18.0-13.14")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-13-snapdragon", pkgver:"4.18.0-13.14")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-aws", pkgver:"4.18.0.1007.7")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-azure", pkgver:"4.18.0.1007.8")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-gcp", pkgver:"4.18.0.1005.5")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-generic", pkgver:"4.18.0.13.14")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-generic-lpae", pkgver:"4.18.0.13.14")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-gke", pkgver:"4.18.0.1005.5")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-kvm", pkgver:"4.18.0.1006.6")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-lowlatency", pkgver:"4.18.0.13.14")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-raspi2", pkgver:"4.18.0.1008.5")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-snapdragon", pkgver:"4.18.0.13.14")) 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, "linux-image-4.18-aws / linux-image-4.18-azure / etc");
}