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("1.18");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  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:
"The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in
the USN-2498-1 advisory.

    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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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-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:N/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 var 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)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  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');
}