Ubuntu 14.04 LTS : Kerberos vulnerabilities (USN-2498-1)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-2498-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(81297);
  script_version("1.17");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id(
    "CVE-2014-5351",
    "CVE-2014-5352",
    "CVE-2014-5353",
    "CVE-2014-5354",
    "CVE-2014-9421",
    "CVE-2014-9422",
    "CVE-2014-9423"
  );
  script_bugtraq_id(
    70380,
    71679,
    71680,
    72494,
    72495,
    72496,
    72503
  );
  script_xref(name:"USN", value:"2498-1");

  script_name(english:"Ubuntu 14.04 LTS : Kerberos vulnerabilities (USN-2498-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"It was discovered that Kerberos incorrectly sent old keys in response
to a -randkey -keepold request. An authenticated remote attacker could
use this issue to forge tickets by leveraging administrative access.
This issue only affected Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu
14.04 LTS. (CVE-2014-5351)

It was discovered that the libgssapi_krb5 library incorrectly
processed security context handles. A remote attacker could use this
issue to cause a denial of service, or possibly execute arbitrary
code. (CVE-2014-5352)

Patrik Kis discovered that Kerberos incorrectly handled LDAP queries
with no results. An authenticated remote attacker could use this issue
to cause the KDC to crash, resulting in a denial of service.
(CVE-2014-5353)

It was discovered that Kerberos incorrectly handled creating database
entries for a keyless principal when using LDAP. An authenticated
remote attacker could use this issue to cause the KDC to crash,
resulting in a denial of service. (CVE-2014-5354)

It was discovered that Kerberos incorrectly handled memory when
processing XDR data. A remote attacker could use this issue to cause
kadmind to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2014-9421)

It was discovered that Kerberos incorrectly handled two-component
server principals. A remote attacker could use this issue to perform
impersonation attacks. (CVE-2014-9422)

It was discovered that the libgssrpc library leaked uninitialized
bytes. A remote attacker could use this issue to possibly obtain
sensitive information. (CVE-2014-9423).

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-2498-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-9421");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2014-9423");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2014/10/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/02/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/02/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-admin-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-gss-samples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-kdc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-kdc-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-locales");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-multidev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-otp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-pkinit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-user");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgssapi-krb5-2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgssrpc4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libk5crypto3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkdb5-7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrad-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrad0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrb5-3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrb5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrb5support0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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) 2015-2020 Canonical, Inc. / NASL script (C) 2015-2019 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)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04', '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': 'krb5-admin-server', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-gss-samples', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-kdc', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-kdc-ldap', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-locales', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-multidev', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-otp', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-pkinit', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'krb5-user', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libgssapi-krb5-2', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libgssrpc4', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libk5crypto3', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkadm5clnt-mit9', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkadm5srv-mit8', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkadm5srv-mit9', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkdb5-7', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkrad-dev', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkrad0', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkrb5-3', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkrb5-dev', 'pkgver': '1.12+dfsg-2ubuntu5.1'},
    {'osver': '14.04', 'pkgname': 'libkrb5support0', 'pkgver': '1.12+dfsg-2ubuntu5.1'}
];

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, 'krb5-admin-server / krb5-gss-samples / krb5-kdc / krb5-kdc-ldap / etc');
}