Dovecot v2.3.11.3 released

[Aki Tuomi]

We are pleased to release v2.3.11.3. Please find it from locations below:

https://dovecot.org/releases/2.3/dovecot-2.3.11.3.tar.gz
https://dovecot.org/releases/2.3/dovecot-2.3.11.3.tar.gz.sig
Binary packages in https://repo.dovecot.org/
Docker images in https://hub.docker.com/r/dovecot/dovecot

Aki Tuomi
Open-Xchange oy

---

* CVE-2020-12100: Parsing mails with a large number of MIME parts could
  have resulted in excessive CPU usage or a crash due to running out of
  stack memory.
* CVE-2020-12673: Dovecot's NTLM implementation does not correctly check
  message buffer size, which leads to reading past allocation which can
  lead to crash.
* CVE-2020-10967: lmtp/submission: Issuing the RCPT command with an
  address that has the empty quoted string as local-part causes the lmtp
  service to crash.
* CVE-2020-12674: Dovecot's RPA mechanism implementation accepts
  zero-length message, which leads to assert-crash later on.
* Events: Fix inconsistency in events. See event documentation in
  https://doc.dovecot.org.
* imap_command_finished event's cmd_name field now contains "unknown"
  for unknown commands. A new "cmd_input_name" field contains the
  command name exactly as it was sent.
* lib-index: Renamed mail_cache_compress_* settings to mail_cache_purge_*.
  Note that these settings are mainly intended for testing and usually
  shouldn't be changed.
* events: Renamed "index" event category to "mail-index".
* events: service:<name> category is now using the name from
  configuration file.
* dns-client: service dns_client was renamed to dns-client.
* log: Prefixes generally use the service name from configuration file.
  For example dict-async service will now use
  "dict-async(pid): " log prefix instead of "dict(pid): "
* *-login: Changed logging done by proxying to use a consistent prefix
  containing the IP address and port.
* *-login: Changed disconnection log messages to be slightly clearer.
+ dict: Add events for dictionaries.
+ lib-index: Finish logging with events.
+ oauth2: Support local validation of JWT tokens.
+ stats: Add support for dynamic histograms and grouping. See
  https://doc.dovecot.org/configuration_manual/stats/.
+ imap: Implement RFC 8514: IMAP SAVEDATE
+ lib-index: If a long-running transaction (e.g. SORT/FETCH on a huge
  folder) adds a lot of data to dovecot.index.cache file, commit those
  changes periodically to make them visible to other concurrent sessions
  as well.
+ stats: Add OpenMetrics exporter for statistics. See
  https://doc.dovecot.org/configuration_manual/stats/openmetrics/.
+ stats: Support disabling stats-writer socket by setting
  stats_writer_socket_path="".
- auth-worker: Process keeps slowly increasing its memory usage and
  eventually dies with "out of memory" due to reaching vsz_limit.
- auth: Prevent potential timing attacks in authentication secret
  comparisons: OAUTH2 JWT-token HMAC, imap-urlauth token, crypt() result.
- auth: Several auth-mechanisms allowed input to be truncated by NUL
  which can potentially lead to unintentional issues or even successful
  logins which should have failed.
- auth: When auth policy returned a delay, auth_request_finished event
  had policy_result=ok field instead of policy_result=delayed.
- auth: auth process crash when auth_policy_server_url is set to an
  invalid URL.
- auth: Lua passdb/userdb leaks stack elements per call, eventually
  causing the stack to become too deep and crashing the auth or
  auth-worker process.
- dict-ldap: Crash occurs if var_expand template expansion fails.
- dict: If dict client disconnected while iteration was still running,
  dict process could have started using 100% CPU, although it was still
  handling clients.
- doveadm: Running doveadm commands via proxying may hang, especially
  when doveadm is printing a lot of output.
- imap: "MOVE * destfolder" goes to a loop copying the last mail to the
  destination until the imap process dies due to running out of memory.
- imap: Running "UID MOVE 1:* Trash" on an empty folder goes to infinite
  loop.
- imap: SEARCH doesn't support $.
- lib-compress: Buffer over-read in zlib stream read.
- lib-dns: If DNS lookup times out, lib-dns can cause crash in calling
  process.
- lib-index: Fixed several bugs in dovecot.index.cache handling that
  could have caused cached data to be lost.
- lib-index: Writing to >=1 GB dovecot.index.cache files may cause
  assert-crashes:
  Panic: file mail-index-util.c: line 37 (mail_index_uint32_to_offset):
  assertion failed: (offset < 0x40000000)
- lib-mail: v2.3.11 regression: MIME parts not returned correctly by
  Dovecot MIME parser.
- lib-ssl-iostream: Fix buggy OpenSSL error handling without
  assert-crashing. If there is no error available, log it as an error
  instead of crashing:
  Panic: file iostream-openssl.c: line 599 (openssl_iostream_handle_error):
  assertion failed: (errno != 0)
- lib-ssl-iostream: ssl_key_password setting did not work.
- pop3-login: Login didn't handle commands in multiple IP packets properly.
  This mainly affected large XCLIENT commands or a large SASL initial
  response parameter in the AUTH command.
- pop3: pop3_deleted_flag setting was broken, causing:
  Panic: file seq-range-array.c: line 472 (seq_range_array_invert):
  assertion failed: (range[count-1].seq2 <= max_seq)
- pop3-login: Login would fail with "Input buffer full" if the initial
  response for SASL was too long.
- submission: A segfault crash may occur when the client or server
  disconnects while a non-transaction command like NOOP or VRFY is still
  being processed.
- virtual: Copying/moving mails with IMAP into a virtual folder
assert-crashes:
  Panic: file cmd-copy.c: line 152 (fetch_and_copy): assertion failed:
  (copy_ctx->copy_count == seq_range_count(&copy_ctx->saved_uids))


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