Ubuntu 18.04 LTS : Linux kernel vulnerability (USN-3652-1) (Spectre)

2018-05-23T00:00:00
ID UBUNTU_USN-3652-1.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2018-2020 Canonical, Inc. / NASL script (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2018-05-23T00:00:00

Description

Jann Horn and Ken Johnson discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via a sidechannel attack. This flaw is known as Spectre Variant 4. A local attacker could use this to expose sensitive information, including 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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3652-1. 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(110045);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/09/17");

  script_cve_id("CVE-2018-3639");
  script_xref(name:"USN", value:"3652-1");

  script_name(english:"Ubuntu 18.04 LTS : Linux kernel vulnerability (USN-3652-1) (Spectre)");
  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:
"Jann Horn and Ken Johnson discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory
reads via a sidechannel attack. This flaw is known as Spectre Variant
4. A local attacker could use this to expose sensitive information,
including 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/3652-1/"
  );
  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: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:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15-lowlatency");
  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-azure-edge");
  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-oem");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/05/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/05/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/05/23");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2018-2020 Canonical, Inc. / NASL script (C) 2018-2020 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)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 18.04", "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);

if (get_one_kb_item("Host/ksplice/kernel-cves"))
{
  rm_kb_item(name:"Host/uptrack-uname-r");
  cve_list = make_list("CVE-2018-3639");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for USN-3652-1");
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

flag = 0;

if (ubuntu_check(osver:"18.04", pkgname:"linux-image-4.15.0-1008-gcp", pkgver:"4.15.0-1008.8")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-4.15.0-1009-aws", pkgver:"4.15.0-1009.9")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-4.15.0-1010-kvm", pkgver:"4.15.0-1010.10")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-4.15.0-22-generic", pkgver:"4.15.0-22.24")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-4.15.0-22-generic-lpae", pkgver:"4.15.0-22.24")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-4.15.0-22-lowlatency", pkgver:"4.15.0-22.24")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-aws", pkgver:"4.15.0.1009.9")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-azure", pkgver:"4.15.0.1012.12")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-azure-edge", pkgver:"4.15.0.1012.12")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-gcp", pkgver:"4.15.0.1008.10")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-generic", pkgver:"4.15.0.22.23")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-generic-lpae", pkgver:"4.15.0.22.23")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-gke", pkgver:"4.15.0.1008.10")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-kvm", pkgver:"4.15.0.1010.10")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-lowlatency", pkgver:"4.15.0.22.23")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"linux-image-oem", pkgver:"4.15.0.1006.8")) 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-4.15-aws / linux-image-4.15-gcp / etc");
}