Ubuntu 16.04 LTS / 18.04 LTS : GNU C Library vulnerabilities (USN-4416-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4416-1. 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(138166);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/21");

  script_cve_id(
    "CVE-2017-12133",
    "CVE-2017-18269",
    "CVE-2018-11236",
    "CVE-2018-11237",
    "CVE-2018-19591",
    "CVE-2018-6485",
    "CVE-2019-19126",
    "CVE-2019-9169",
    "CVE-2020-10029",
    "CVE-2020-1751",
    "CVE-2020-1752"
  );
  script_xref(name:"USN", value:"4416-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : GNU C Library vulnerabilities (USN-4416-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Florian Weimer discovered that the GNU C Library incorrectly handled
certain memory operations. A remote attacker could use this issue to
cause the GNU C Library to crash, resulting in a denial of service, or
possibly execute arbitrary code. This issue only affected Ubuntu 16.04
LTS. (CVE-2017-12133) It was discovered that the GNU C Library
incorrectly handled certain SSE2-optimized memmove operations. A
remote attacker could use this issue to cause the GNU C Library to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-18269) It
was discovered that the GNU C Library incorrectly handled certain
pathname operations. A remote attacker could use this issue to cause
the GNU C Library to crash, resulting in a denial of service, or
possibly execute arbitrary code. This issue only affected Ubuntu 18.04
LTS. (CVE-2018-11236) It was discovered that the GNU C Library
incorrectly handled certain AVX-512-optimized mempcpy operations. A
remote attacker could use this issue to cause the GNU C Library to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-11237) It
was discovered that the GNU C Library incorrectly handled certain
hostname loookups. A remote attacker could use this issue to cause the
GNU C Library to crash, resulting in a denial of service, or possibly
execute arbitrary code. This issue only affected Ubuntu 18.04 LTS.
(CVE-2018-19591) Jakub Wilk discovered that the GNU C Library
incorrectly handled certain memalign functions. A remote attacker
could use this issue to cause the GNU C Library to crash, resulting in
a denial of service, or possibly execute arbitrary code. This issue
only affected Ubuntu 16.04 LTS. (CVE-2018-6485) It was discovered that
the GNU C Library incorrectly ignored the LD_PREFER_MAP_32BIT_EXEC
environment variable after security transitions. A local attacker
could use this issue to bypass ASLR restrictions. (CVE-2019-19126) It
was discovered that the GNU C Library incorrectly handled certain
regular expressions. A remote attacker could possibly use this issue
to cause the GNU C Library to crash, resulting in a denial of service.
This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
(CVE-2019-9169) It was discovered that the GNU C Library incorrectly
handled certain bit patterns. A remote attacker could use this issue
to cause the GNU C Library to crash, resulting in a denial of service,
or possibly execute arbitrary code. This issue only affected Ubuntu
16.04 LTS and Ubuntu 18.04 LTS. (CVE-2020-10029) It was discovered
that the GNU C Library incorrectly handled certain signal trampolines
on PowerPC. A remote attacker could use this issue to cause the GNU C
Library to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2020-1751) It was discovered that the GNU
C Library incorrectly handled tilde expansion. A remote attacker could
use this issue to cause the GNU C Library to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2020-1752).

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://ubuntu.com/security/notices/USN-4416-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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-2019-9169");

  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:"2017/09/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-armel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-armel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-ppc64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-s390");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-x32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-pic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-ppc64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-s390");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-x32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:locales");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:locales-all");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:multiarch-support");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nscd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:glibc-source");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc-dev-bin");
  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) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', 'Ubuntu ' + os_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);

var pkgs = [
    {'osver': '16.04', 'pkgname': 'glibc-source', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc-bin', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc-dev-bin', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-amd64', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-armel', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-dev', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-armel', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-ppc64', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-s390', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-i386', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-pic', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-ppc64', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-s390', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-udeb', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'libc6-x32', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'locales', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'locales-all', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'multiarch-support', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '16.04', 'pkgname': 'nscd', 'pkgver': '2.23-0ubuntu11.2'},
    {'osver': '18.04', 'pkgname': 'glibc-source', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc-bin', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc-dev-bin', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-amd64', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-armel', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-armel', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-s390', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-i386', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-pic', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-s390', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-udeb', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'libc6-x32', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'locales', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'locales-all', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'multiarch-support', 'pkgver': '2.27-3ubuntu1.2'},
    {'osver': '18.04', 'pkgname': 'nscd', 'pkgver': '2.27-3ubuntu1.2'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) 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, 'glibc-source / libc-bin / libc-dev-bin / libc6 / libc6-amd64 / etc');
}