Ubuntu 18.04 LTS / 19.10 : Linux kernel vulnerabilities (USN-4412-1)

2020-07-06T00:00:00
ID UBUNTU_USN-4412-1.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-07-06T00:00:00

Description

Matthew Sheets discovered that the SELinux network label handling implementation in the Linux kernel could be coerced into de-referencing a NULL pointer. A remote attacker could use this to cause a denial of service (system crash). (CVE-2020-10711) It was discovered that the SCSI generic (sg) driver in the Linux kernel did not properly handle certain error conditions correctly. A local privileged attacker could use this to cause a denial of service (system crash). (CVE-2020-12770) It was discovered that the USB Gadget device driver in the Linux kernel did not validate arguments passed from configfs in some situations. A local attacker could possibly use this to cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2020-13143) Dmitry Vyukov discovered that the SELinux netlink security hook in the Linux kernel did not validate messages in some situations. A privileged attacker could use this to bypass SELinux netlink restrictions. (CVE-2020-10751) It was discovered that the KVM implementation in the Linux kernel did not properly deallocate memory on initialization for some processors. A local attacker could possibly use this to cause a denial of service. (CVE-2020-12768).

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-4412-1. 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(138137);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/09/17");

  script_cve_id("CVE-2020-10711", "CVE-2020-10751", "CVE-2020-12768", "CVE-2020-12770", "CVE-2020-13143");
  script_xref(name:"USN", value:"4412-1");

  script_name(english:"Ubuntu 18.04 LTS / 19.10 : Linux kernel vulnerabilities (USN-4412-1)");
  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:
"Matthew Sheets discovered that the SELinux network label handling
implementation in the Linux kernel could be coerced into
de-referencing a NULL pointer. A remote attacker could use this to
cause a denial of service (system crash). (CVE-2020-10711) It was
discovered that the SCSI generic (sg) driver in the Linux kernel did
not properly handle certain error conditions correctly. A local
privileged attacker could use this to cause a denial of service
(system crash). (CVE-2020-12770) It was discovered that the USB Gadget
device driver in the Linux kernel did not validate arguments passed
from configfs in some situations. A local attacker could possibly use
this to cause a denial of service (system crash) or possibly expose
sensitive information. (CVE-2020-13143) Dmitry Vyukov discovered that
the SELinux netlink security hook in the Linux kernel did not validate
messages in some situations. A privileged attacker could use this to
bypass SELinux netlink restrictions. (CVE-2020-10751) It was
discovered that the KVM implementation in the Linux kernel did not
properly deallocate memory on initialization for some processors. A
local attacker could possibly use this to cause a denial of service.
(CVE-2020-12768).

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/4412-1/"
  );
  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:P");
  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:H/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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3-snapdragon");
  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-hwe-18.04");
  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-generic-lpae-hwe-18.04");
  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-gkeop-5.3");
  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-lowlatency-hwe-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle");
  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-snapdragon-hwe-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-18.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:19.10");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/06");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

  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);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(18\.04|19\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 18.04 / 19.10", "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);

if (get_one_kb_item("Host/ksplice/kernel-cves"))
{
  rm_kb_item(name:"Host/uptrack-uname-r");
  cve_list = make_list("CVE-2020-10711", "CVE-2020-10751", "CVE-2020-12768", "CVE-2020-12770", "CVE-2020-13143");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for USN-4412-1");
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

flag = 0;

if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-1028-oracle", pkgver:"5.3.0-1028.30~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-1028-raspi2", pkgver:"5.3.0-1028.30~18.04.2")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-1030-aws", pkgver:"5.3.0-1030.32~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-1030-gcp", pkgver:"5.3.0-1030.32~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-1030-gke", pkgver:"5.3.0-1030.32~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-1032-azure", pkgver:"5.3.0-1032.33~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-62-generic", pkgver:"5.3.0-62.56~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-62-generic-lpae", pkgver:"5.3.0-62.56~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-5.3.0-62-lowlatency", pkgver:"5.3.0-62.56~18.04.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-gcp", pkgver:"5.3.0.1030.24")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-generic-hwe-18.04", pkgver:"5.3.0.62.115")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-generic-lpae-hwe-18.04", pkgver:"5.3.0.62.115")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-gkeop-5.3", pkgver:"5.3.0.62.115")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-lowlatency-hwe-18.04", pkgver:"5.3.0.62.115")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-oracle", pkgver:"5.3.0.1028.25")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-snapdragon-hwe-18.04", pkgver:"5.3.0.62.115")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-virtual-hwe-18.04", pkgver:"5.3.0.62.115")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-1024-kvm", pkgver:"5.3.0-1024.26")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-1028-oracle", pkgver:"5.3.0-1028.30")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-1030-aws", pkgver:"5.3.0-1030.32")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-1030-gcp", pkgver:"5.3.0-1030.32")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-1031-azure", pkgver:"5.3.0-1031.32")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-1032-azure", pkgver:"5.3.0-1032.33")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-62-generic", pkgver:"5.3.0-62.56")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-62-generic-lpae", pkgver:"5.3.0-62.56")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-62-lowlatency", pkgver:"5.3.0-62.56")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-5.3.0-62-snapdragon", pkgver:"5.3.0-62.56")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-azure", pkgver:"5.3.0.1031.49")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-gcp", pkgver:"5.3.0.1030.40")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-generic", pkgver:"5.3.0.62.52")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-generic-lpae", pkgver:"5.3.0.62.52")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-gke", pkgver:"5.3.0.1030.40")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-kvm", pkgver:"5.3.0.1024.22")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-lowlatency", pkgver:"5.3.0.62.52")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-oracle", pkgver:"5.3.0.1028.43")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-snapdragon", pkgver:"5.3.0.62.52")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"linux-image-virtual", pkgver:"5.3.0.62.52")) 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, "linux-image-5.3-aws / linux-image-5.3-azure / linux-image-5.3-gcp / etc");
}