Linux Distros Unpatched Vulnerability : CVE-2017-6594

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(254382);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/08/24");

  script_cve_id("CVE-2017-6594");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2017-6594");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - The transit path validation code in Heimdal before 7.3 might allow attackers to bypass the capath policy
    protection mechanism by leveraging failure to add the previous hop realm to the transit path of issued
    tickets. (CVE-2017-6594)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2017-6594");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  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:N/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-6594");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/08/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/24");

  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:"p-cpe:/a:canonical:ubuntu_linux:heimdal");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "heimdal-clients"},
          {"reference": "heimdal-clients-x"},
          {"reference": "heimdal-dbg"},
          {"reference": "heimdal-dev"},
          {"reference": "heimdal-docs"},
          {"reference": "heimdal-kcm"},
          {"reference": "heimdal-kdc"},
          {"reference": "heimdal-multidev"},
          {"reference": "heimdal-servers"},
          {"reference": "heimdal-servers-x"},
          {"reference": "libasn1-8-heimdal"},
          {"reference": "libgssapi3-heimdal"},
          {"reference": "libhcrypto4-heimdal"},
          {"reference": "libhdb9-heimdal"},
          {"reference": "libheimbase1-heimdal"},
          {"reference": "libheimntlm0-heimdal"},
          {"reference": "libhx509-5-heimdal"},
          {"reference": "libkadm5clnt7-heimdal"},
          {"reference": "libkadm5srv8-heimdal"},
          {"reference": "libkafs0-heimdal"},
          {"reference": "libkdc2-heimdal"},
          {"reference": "libkrb5-26-heimdal"},
          {"reference": "libotp0-heimdal"},
          {"reference": "libroken18-heimdal"},
          {"reference": "libsl0-heimdal"},
          {"reference": "libwind0-heimdal"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "heimdal-clients"},
          {"reference": "heimdal-dbg"},
          {"reference": "heimdal-dev"},
          {"reference": "heimdal-docs"},
          {"reference": "heimdal-kcm"},
          {"reference": "heimdal-kdc"},
          {"reference": "heimdal-multidev"},
          {"reference": "heimdal-servers"},
          {"reference": "libasn1-8-heimdal"},
          {"reference": "libgssapi3-heimdal"},
          {"reference": "libhcrypto4-heimdal"},
          {"reference": "libhdb9-heimdal"},
          {"reference": "libheimbase1-heimdal"},
          {"reference": "libheimntlm0-heimdal"},
          {"reference": "libhx509-5-heimdal"},
          {"reference": "libkadm5clnt7-heimdal"},
          {"reference": "libkadm5srv8-heimdal"},
          {"reference": "libkafs0-heimdal"},
          {"reference": "libkdc2-heimdal"},
          {"reference": "libkrb5-26-heimdal"},
          {"reference": "libotp0-heimdal"},
          {"reference": "libroken18-heimdal"},
          {"reference": "libsl0-heimdal"},
          {"reference": "libwind0-heimdal"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}