Zyxel Router Command Injection Vulnerability (CVE-2017-6884)

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

include('compat.inc');

if (description)
{
  script_id(185418);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/09");

  script_cve_id("CVE-2017-6884");
  script_xref(name:"EDB-ID", value:"41782");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2023/10/09");

  script_name(english:"Zyxel Router Command Injection Vulnerability (CVE-2017-6884)");

  script_set_attribute(attribute:"synopsis", value:
"The remote router is affected by a command injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its model number and firmware revision, the remote Zyxel Router is affected by a command injection
vulnerability within nslookup funciton of the diagnostic tools. An authenticated, remote attacker can exploit this, via
various crafted HTTP commands, to execute arbitrary commands.");
  # https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-vulnerability-in-emg2926-q10a-ethernet-cpe
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2b6a48e7");
  script_set_attribute(attribute:"solution", value:
"Contact vendor for remediation instructions.");
  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:F/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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-6884");

  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:"2017/04/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/04/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/11/09");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/h:zyxel");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("zyxel_router_detect_getbasicinfo.nbin");
  script_require_keys("www/zyxel_router");
  script_require_ports("Services/www", 80, 443);

  exit(0);
}

include('http.inc');
include('vcf_extras.inc');

var app_info = vcf::zyxel_router::get_app_info();

var constraints = [{
  'models'        : make_list('EMG2926-Q10A'),
  'equal'         : vcf::zyxel_router::transform_ver(firmware:'V1.00(AAQT.4)b8'),
  'fixed_display' : 'See Vendor Advisory'
}];

vcf::zyxel_router::check_version_and_report(
    app_info    : app_info,
    constraints : constraints,
    severity    : SECURITY_HOLE
);