Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : GNU C Library vulnerabilities (USN-6762-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6762-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(194950);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/02");

  script_cve_id(
    "CVE-2014-9984",
    "CVE-2015-20109",
    "CVE-2018-11236",
    "CVE-2021-3999",
    "CVE-2024-2961"
  );
  script_xref(name:"USN", value:"6762-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : GNU C Library vulnerabilities (USN-6762-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6762-1 advisory.

  - nscd in the GNU C Library (aka glibc or libc6) before version 2.20 does not correctly compute the size of
    an internal buffer when processing netgroup requests, possibly leading to an nscd daemon crash or code
    execution as the user running nscd. (CVE-2014-9984)

  - end_pattern (called from internal_fnmatch) in the GNU C Library (aka glibc or libc6) before 2.22 might
    allow context-dependent attackers to cause a denial of service (application crash), as demonstrated by use
    of the fnmatch library function with the **(!() pattern. NOTE: this is not the same as CVE-2015-8984;
    also, some Linux distributions have fixed CVE-2015-8984 but have not fixed this additional fnmatch issue.
    (CVE-2015-20109)

  - stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very
    long pathname arguments to the realpath function, could encounter an integer overflow on 32-bit
    architectures, leading to a stack-based buffer overflow and, potentially, arbitrary code execution.
    (CVE-2018-11236)

  - A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory
    corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and
    size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and
    escalate their privileges on the system. (CVE-2021-3999)

  - The iconv() function in the GNU C Library versions 2.39 and older may overflow the output buffer passed to
    it by up to 4 bytes when converting strings to the ISO-2022-CN-EXT character set, which may be used to
    crash an application or overwrite a neighbouring variable. (CVE-2024-2961)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-6762-1");
  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-2018-11236");

  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:"2017/06/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/05/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/05/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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:eglibc-source");
  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:"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-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-lse");
  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-prof");
  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-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:"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) 2024 Canonical, Inc. / NASL script (C) 2024 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 (! ('14.04' >< os_release || '16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 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': '14.04', 'pkgname': 'eglibc-source', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc-bin', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc-dev-bin', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-amd64', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-armel', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-dev', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-dev-armel', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-i386', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-pic', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-prof', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'libc6-x32', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'multiarch-support', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '14.04', 'pkgname': 'nscd', 'pkgver': '2.19-0ubuntu6.15+esm3'},
    {'osver': '16.04', 'pkgname': 'glibc-source', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc-bin', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc-dev-bin', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-amd64', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-armel', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-dev', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-armel', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-s390', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-i386', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-pic', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-s390', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'libc6-x32', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'locales', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'locales-all', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'multiarch-support', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '16.04', 'pkgname': 'nscd', 'pkgver': '2.23-0ubuntu11.3+esm6'},
    {'osver': '18.04', 'pkgname': 'glibc-source', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc-bin', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc-dev-bin', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-amd64', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-armel', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-armel', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-s390', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-i386', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-lse', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-pic', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-s390', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'libc6-x32', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'locales', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'locales-all', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'multiarch-support', 'pkgver': '2.27-3ubuntu1.6+esm2'},
    {'osver': '18.04', 'pkgname': 'nscd', 'pkgver': '2.27-3ubuntu1.6+esm2'}
];

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, 'eglibc-source / glibc-source / libc-bin / libc-dev-bin / libc6 / etc');
}