diff options
author | Shugo Maeda <shugo@ruby-lang.org> | 2021-05-11 10:31:27 +0900 |
---|---|---|
committer | nagachika <nagachika@ruby-lang.org> | 2021-07-07 19:08:18 +0900 |
commit | e2ac25d0eb66de99f098d6669cf4f06796aa6256 (patch) | |
tree | f302700f02791d309bbbf695573e6b0705ceb91c | |
parent | fc71da2673b4cef08749a6756c3fe2ca214820b7 (diff) |
Fix StartTLS stripping vulnerability
This fixes CVE-2021-32066.
Reported by Alexandr Savca in <https://hackerone.com/reports/1178562>.
-rw-r--r-- | lib/net/imap.rb | 8 | ||||
-rw-r--r-- | test/net/imap/test_imap.rb | 31 |
2 files changed, 38 insertions, 1 deletions
diff --git a/lib/net/imap.rb b/lib/net/imap.rb index 505b4c8950..d45304f289 100644 --- a/lib/net/imap.rb +++ b/lib/net/imap.rb @@ -1218,12 +1218,14 @@ module Net end resp = @tagged_responses.delete(tag) case resp.name + when /\A(?:OK)\z/ni + return resp when /\A(?:NO)\z/ni raise NoResponseError, resp when /\A(?:BAD)\z/ni raise BadResponseError, resp else - return resp + raise UnknownResponseError, resp end end @@ -3719,6 +3721,10 @@ module Net class ByeResponseError < ResponseError end + # Error raised upon an unknown response from the server. + class UnknownResponseError < ResponseError + end + RESPONSE_ERRORS = Hash.new(ResponseError) RESPONSE_ERRORS["NO"] = NoResponseError RESPONSE_ERRORS["BAD"] = BadResponseError diff --git a/test/net/imap/test_imap.rb b/test/net/imap/test_imap.rb index 8b924b524e..85fb71d440 100644 --- a/test/net/imap/test_imap.rb +++ b/test/net/imap/test_imap.rb @@ -127,6 +127,16 @@ class IMAPTest < Test::Unit::TestCase imap.disconnect end end + + def test_starttls_stripping + starttls_stripping_test do |port| + imap = Net::IMAP.new("localhost", :port => port) + assert_raise(Net::IMAP::UnknownResponseError) do + imap.starttls(:ca_file => CA_FILE) + end + imap + end + end end def start_server @@ -834,6 +844,27 @@ EOF end end + def starttls_stripping_test + server = create_tcp_server + port = server.addr[1] + start_server do + sock = server.accept + begin + sock.print("* OK test server\r\n") + sock.gets + sock.print("RUBY0001 BUG unhandled command\r\n") + ensure + sock.close + server.close + end + end + begin + imap = yield(port) + ensure + imap.disconnect if imap && !imap.disconnected? + end + end + def create_tcp_server return TCPServer.new(server_addr, 0) end |