Ubuntu 18.10 : linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2 vulnerability (USN-4006-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4006-1. 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(125722);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/16");

  script_cve_id("CVE-2019-11191");
  script_xref(name:"USN", value:"4006-1");

  script_name(english:"Ubuntu 18.10 : linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2 vulnerability (USN-4006-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security-related
patches.");
  script_set_attribute(attribute:"description", value:
"Federico Manuel Bento discovered that the Linux kernel did not
properly apply Address Space Layout Randomization (ASLR) in some
situations for setuid a.out binaries. A local attacker could use this
to improve the chances of exploiting an existing vulnerability in a
setuid a.out binary.

As a hardening measure, this update disables a.out support.

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/4006-1/");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-11191");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/04/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/06/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/06/05");

  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-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-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) 2019-2024 Canonical, Inc. / NASL script (C) 2019-2024 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-2019-11191");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for USN-4006-1");
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

var flag = 0;

if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1012-gcp", pkgver:"4.18.0-1012.13")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1013-kvm", pkgver:"4.18.0-1013.13")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1015-raspi2", pkgver:"4.18.0-1015.17")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-1017-aws", pkgver:"4.18.0-1017.19")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-21-generic", pkgver:"4.18.0-21.22")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-21-generic-lpae", pkgver:"4.18.0-21.22")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-21-lowlatency", pkgver:"4.18.0-21.22")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-4.18.0-21-snapdragon", pkgver:"4.18.0-21.22")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-aws", pkgver:"4.18.0.1017.17")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-gcp", pkgver:"4.18.0.1012.12")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-generic", pkgver:"4.18.0.21.22")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-generic-lpae", pkgver:"4.18.0.21.22")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-gke", pkgver:"4.18.0.1012.12")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-kvm", pkgver:"4.18.0.1013.13")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-lowlatency", pkgver:"4.18.0.21.22")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-raspi2", pkgver:"4.18.0.1015.12")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"linux-image-snapdragon", pkgver:"4.18.0.21.22")) 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-gcp / etc");
}