Ubuntu 19.04 : Linux kernel vulnerabilities (USN-4069-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4069-1. 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(126950);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/08");

  script_cve_id(
    "CVE-2019-11487",
    "CVE-2019-11599",
    "CVE-2019-11833",
    "CVE-2019-11884"
  );
  script_xref(name:"USN", value:"4069-1");

  script_name(english:"Ubuntu 19.04 : Linux kernel vulnerabilities (USN-4069-1)");

  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 existed in the Linux kernel
when reference counting pages, leading to potential use-after-free
issues. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-11487)

Jann Horn discovered that a race condition existed in the Linux kernel
when performing core dumps. A local attacker could use this to cause a
denial of service (system crash) or expose sensitive information.
(CVE-2019-11599)

It was discovered that the ext4 file system implementation in the
Linux kernel did not properly zero out memory in some situations. A
local attacker could use this to expose sensitive information (kernel
memory). (CVE-2019-11833)

It was discovered that the Bluetooth Human Interface Device Protocol
(HIDP) implementation in the Linux kernel did not properly verify
strings were NULL terminated in certain situations. A local attacker
could use this to expose sensitive information (kernel memory).
(CVE-2019-11884).

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/4069-1/");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-11487");

  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:"2019/04/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/07/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0-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:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:19.04");
  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:"^(19\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 19.04", "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-2019-11487", "CVE-2019-11599", "CVE-2019-11833", "CVE-2019-11884");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for USN-4069-1");
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

var flag = 0;

if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-1011-aws", pkgver:"5.0.0-1011.12")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-1011-gcp", pkgver:"5.0.0-1011.11")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-1011-kvm", pkgver:"5.0.0-1011.12")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-1012-azure", pkgver:"5.0.0-1012.12")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-1013-raspi2", pkgver:"5.0.0-1013.13")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-1017-snapdragon", pkgver:"5.0.0-1017.18")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-21-generic", pkgver:"5.0.0-21.22")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-21-generic-lpae", pkgver:"5.0.0-21.22")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-5.0.0-21-lowlatency", pkgver:"5.0.0-21.22")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-aws", pkgver:"5.0.0.1011.11")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-azure", pkgver:"5.0.0.1012.11")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-gcp", pkgver:"5.0.0.1011.11")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-generic", pkgver:"5.0.0.21.22")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-generic-lpae", pkgver:"5.0.0.21.22")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-gke", pkgver:"5.0.0.1011.11")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-kvm", pkgver:"5.0.0.1011.11")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-lowlatency", pkgver:"5.0.0.21.22")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-raspi2", pkgver:"5.0.0.1013.10")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-snapdragon", pkgver:"5.0.0.1017.10")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"linux-image-virtual", pkgver:"5.0.0.21.22")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    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-5.0-aws / linux-image-5.0-azure / linux-image-5.0-gcp / etc");
}