Dovecot v2.3.11.3 released

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(©_ctx->saved_uids))