Ubuntu 17.10 : linux vulnerabilities (USN-3581-1) (Spectre)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3581-1. 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(106969);
  script_version("3.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/05/11");

  script_cve_id("CVE-2017-15115", "CVE-2017-17712", "CVE-2017-5715", "CVE-2017-8824");
  script_xref(name:"USN", value:"3581-1");
  script_xref(name:"IAVA", value:"2018-A-0020");

  script_name(english:"Ubuntu 17.10 : linux vulnerabilities (USN-3581-1) (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:
"Mohamed Ghannam discovered that the IPv4 raw socket implementation in
the Linux kernel contained a race condition leading to uninitialized
pointer usage. A local attacker could use this to cause a denial of
service or possibly execute arbitrary code. (CVE-2017-17712)

ChunYu Wang discovered that a use-after-free vulnerability existed in
the SCTP protocol implementation in the Linux kernel. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code, (CVE-2017-15115)

Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP
protocol implementation in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2017-8824)

USN-3541-1 mitigated CVE-2017-5715 (Spectre Variant 2) for the amd64
architecture in Ubuntu 17.10. This update provides the compiler-based
retpoline kernel mitigation for the amd64 and i386 architectures. 

Jann Horn discovered that microprocessors utilizing speculative
execution and branch prediction may allow unauthorized memory reads
via sidechannel attacks. This flaw is known as Spectre. A local
attacker could use this to expose sensitive information, including
kernel memory. (CVE-2017-5715).

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/3581-1/"
  );
  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:H/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:H/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:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.13-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.13-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.13-lowlatency");
  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-lowlatency");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:17.10");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/02/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/02/23");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2018-2023 Canonical, Inc. / NASL script (C) 2018-2023 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);
var release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(17\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 17.10", "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-2017-15115", "CVE-2017-17712", "CVE-2017-5715", "CVE-2017-8824");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for USN-3581-1");
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

var flag = 0;

if (ubuntu_check(osver:"17.10", pkgname:"linux-image-4.13.0-36-generic", pkgver:"4.13.0-36.40")) flag++;
if (ubuntu_check(osver:"17.10", pkgname:"linux-image-4.13.0-36-generic-lpae", pkgver:"4.13.0-36.40")) flag++;
if (ubuntu_check(osver:"17.10", pkgname:"linux-image-4.13.0-36-lowlatency", pkgver:"4.13.0-36.40")) flag++;
if (ubuntu_check(osver:"17.10", pkgname:"linux-image-generic", pkgver:"4.13.0.36.38")) flag++;
if (ubuntu_check(osver:"17.10", pkgname:"linux-image-generic-lpae", pkgver:"4.13.0.36.38")) flag++;
if (ubuntu_check(osver:"17.10", pkgname:"linux-image-lowlatency", pkgver:"4.13.0.36.38")) 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-4.13-generic / linux-image-4.13-generic-lpae / etc");
}