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Dovecot v2.3.14.rc1 released
by Aki Tuomi 17 Feb '21

17 Feb '21

We are pleased to release first release candidate for v2.3.14. We have done changes to packaging so please give us any feedback on how it works. https://dovecot.org/releases/2.3/rc/dovecot-2.3.14.rc1.tar.gz https://dovecot.org/releases/2.3/rc/dovecot-2.3.14.rc1.tar.gz.sig Binary packages in https://repo.dovecot.org/ Docker images are not available for this release candidate. Kind regards, Aki Tuomi Open-Xchange oy --- * Added new aliases for some variables. Usage of the old ones is possible, but discouraged. (These were partially added already to v2.3.13.) See https://doc.dovecot.org/configuration_manual/config_file/config_variables/ for more information. * Optimize imap/pop3/submission/managesieve proxies to use less CPU at the cost of extra memory usage. * Remove autocreate, expire, snarf and mail-filter plugins. * Remove cydir storage driver. * doveadm -D: Add timestamps to debug output even when LOG_STDERR_TIMESTAMP environment variable is not set. Timestamp format is taken from log_timestamp setting. * If BROKENCHAR or listescape plugin is used, the escaped folder names may be slightly different from before in some situations. This is unlikely to cause issues, although caching clients may redownload the folders. * imapc: It now enables BROKENCHAR=~ by default to escape remote folder names if necessary. This also means that if there are any '~' characters in the remote folder names, they will be visible as "~7e". * imapc: When using local index files folder names were escaped on filesystem a bit differently. This affects only if there are folder names that actually require escaping, which isn't so common. The old style folders will be automatically deleted from filesystem. * stats: Update exported metrics to be compliant with OpenMetrics standard. + doveadm: Add an optional '-p' parameter to metadata list command. If enabled, "/private", and "/shared" metadata prefixes will be prepended to the keys in the list output. + doveconf: Support environment variables in config files. See https://doc.dovecot.org/configuration_manual/config_file/config_file_syntax… for more details. + indexer-worker: Change indexer to disconnect from indexer-worker after each request. This allows service indexer-worker's service_count & idle_kill settings to work. These can be used to restart indexer-worker processes once in a while to reduce their memory usage. - auth: "nodelay" with various authentication mechanisms such as apop and digest-md5 crashed AUTH process if authentication failed. - auth: Auth lua script generating an error triggered an assertion failure: Panic: file db-lua.c: line 630 (auth_lua_call_password_verify): assertion failed: (lua_gettop(script->L) == 0). - configure: Fix libunwind detection to work on other than x86_64 systems. - doveadm-server: Process could crash if logging was done outside command handling. For example http-client could have done debug logging afterwards, resulting in either segfault or Panic: file http-client.c: line 642 (http_client_context_close): assertion failed: (cctx->clients_list == NULL). - dsync: Folder name escaping with BROKENCHAR didn't work completely correctly. This especially caused problems with dsync-migrations using imapc where some of the remote folder names may not have been accessible. - dsync: doveadm sync + imapc doesn't always sync all mails when doing an incremental sync (-1), which could lead to mail loss when it's used for migration. This happens only when GUIDs aren't used (i.e. imapc without imapc_features=guid-forced). - lib-imap: imapc parsing illegal BODYSTRUCTUREs with NILs could have resulted in crashes. This exposed that Dovecot was wrongly accepting atoms in "nstring" handling. Changed the IMAP parsing to be more strict about this now. - lib-index: If dovecot.index.cache has corrupted message size, fetching BODY/BODYSTRUCTURE may cause assert-crash: Panic: file index-mail.c: line 1140 (index_mail_parse_body_finish): assertion failed: (mail->data.parts != NULL). - lib-index: Minor error handling and race condition fixes related to rotating dovecot.index.log. These didn't usually cause problems, unless the log files were rotated rapidly. - lib-lua: Lua scripts using coroutines or lua libraries using coroutines (e.g., cqueues) panicked. - Message PREVIEW handled whitespace wrong so first space would get eaten from between words. - FTS and message PREVIEW (snippet) parsed HTML &entities case-sensitively. - lib-mail: When max nested MIME parts were reached, IMAP BODYSTRUCTURE was written in a way that may have caused confusion for IMAP clients and also Dovecot itself when parsing it. The truncated part is now written out using application/octet-stream MIME type. - lib-oauth2: HS512 and HS384 JWT token algorithms crash when you try to use them: Panic: file hmac.c: line 26 (hmac_init): assertion failed: (meth->context_size <= MAC_MAX_CONTEXT_SIZE). - event filters: NOT keyword did not have the correct associativity. NOT a AND b were getting parsed as NOT (a AND b) instead of (NOT a) AND b. - Ignore ECONNRESET when closing socket. This avoids logging useless errors on systems like FreeBSD. - event filters: event filter syntax error may lead to Panic: file event-filter.c: line 137 (event_filter_parse): assertion failed: (state.output == NULL) - lib: timeval_cmp_margin() was broken on 32-bit systems. This could potentially have caused HTTP timeouts to be handled incorrectly. - log: instance_name wasn't used as syslog ident by the log process. - master: After a service reached process_limit and client_limit, it could have taken up to 1 second to realize that more client connections became available. During this time client connections could have been unnecessarily rejected and a warning logged: Warning: service(...): process_limit (...) reached, client connections are being dropped - stats: Crash would occur when generating openmetrics data for metrics using aggregating functions. - stats: Event filters comparing against empty strings crash the stats process.

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Ubuntu packages
by Aki Tuomi 06 Jan '21

06 Jan '21

Hi! Since Ubuntu 20.04 LTS is nowadays available, we have dropped 16.04 support from 2.3.13 as per policy of supporting two latest releases of operating system. Dovecot 2.3.11.3 is latest version we provide packages for 16.04. Please find Ubuntu 20.04 packages at https://repo.dovecot.org/ Kind regards, Aki Tuomi Open-Xchange oy

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CVE-2020-25275: MIME parsing crashes with particular messages
by Aki Tuomi 04 Jan '21

04 Jan '21

Open-Xchange Security Advisory 2021-01-04 Product: Dovecot Vendor: OX Software GmbH Internal reference: DOV-4113 (Bug ID) Vulnerability type: CWE-20: Improper Input Validation Vulnerable version: 2.3.11-2.3.11.3 Vulnerable component: lda, lmtp, imap Report confidence: Confirmed Solution status: Fixed by Vendor Fixed version: 2.3.13 Vendor notification: 2020-09-10 Solution date: 2020-09-14 Public disclosure: 2021-01-04 CVE reference: CVE-2020-25275 CVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) Researcher credit: Innokentii Sennovskiy (Rumata888) from BI.ZONE Vulnerability Details: Mail delivery / parsing crashed when the 10 000th MIME part was message/rfc822 (or if parent was multipart/digest). This happened due to earlier MIME parsing changes for CVE-2020-12100. Risk: Malicious sender can crash dovecot repeatedly by sending / uploading message with more than 10 000 MIME parts. Workaround: These are usually dropped by MTA, where the mitigation can also be applied. Solution: Operators should update to 2.3.13 or later version.

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CVE-2020-24386: IMAP hibernation allows accessing other peoples mail
by Aki Tuomi 04 Jan '21

04 Jan '21

Open-Xchange Security Advisory 2021-01-04 Product: Dovecot Vendor: OX Software GmbH Internal reference: DOP-2009 (Bug ID) Vulnerability type: CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences Vulnerable version: 2.2.26-2.3.11.3 Vulnerable component: imap Report confidence: Confirmed Solution status: Fixed by Vendor Fixed version: 2.3.13 Vendor notification: 2020-08-17 Solution date: 2020-08-27 Public disclosure: 2021-01-04 CVE reference: CVE-2020-24386 CVSS: 8.2 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N) Vulnerability Details: When imap hibernation is active, an attacker can cause Dovecot to discover file system directory structure and access other users' emails using specially crafted command. The attacker must have valid credentials to access the mail server. Risk: Attacker can access other users' emails and filesystem information. Workaround: Operators can choose to disable IMAP hibernation. IMAP hibernation is not on by default. To ensure imap hibernation is disabled, make sure imap_hibernate_timeout is set to 0 or unset. Solution: Operators should update to 2.3.13 or later version.

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Pigeonhole v0.5.13 released
by Aki Tuomi 04 Jan '21

04 Jan '21

We are pleased to release pigeonhole 0.5.13. You can download it from locations below: https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.13.t… https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.13.t… Binary packages in https://repo.dovecot.org/ Docker images in https://hub.docker.com/r/dovecot/dovecot Aki Tuomi Open-Xchange oy --- - duplicate: The test was handled badly in a multiscript (sieve_before, sieve_after) scenario in which an earlier script in the sequence with a duplicate test succeeded, while a later script caused a runtime failure. In that case, the message is recorded for duplicate tracking, while the message may not actually have been delivered in the end. - editheader: Sieve interpreter entered infinite loop at startup when the "editheader" configuration listed an invalid header name. This problem can only be triggered by the administrator. - relational: The Sieve relational extension can cause a segfault at compile time. This is triggered by invalid script syntax. The segfault happens when this match type is the last argument of the test command. This situation is not possible in a valid script; positional arguments are normally present after that, which would prevent the segfault. - sieve: For some Sieve commands the provided mailbox name is not properly checked for UTF-8 validity, which can cause assert crashes at runtime when an invalid mailbox name is encountered. This can be caused by the user by writing a bad Sieve script involving the affected commands ("mailboxexists", "specialuse_exists"). This can be triggered by the remote sender only when the user has written a Sieve script that passes message content to one of the affected commands. - sieve: Large sequences of 8-bit octets passed to certain Sieve commands that create or modify message headers that allow UTF-8 text (vacation, notify and addheader) can cause the delivery or IMAP process (when IMAPSieve is used) to enter a memory-consuming semi-infinite loop that ends when the process exceeds its memory limits. Logged in users can cause these hangs only for their own processes.

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Dovecot v2.3.13 released
by Aki Tuomi 04 Jan '21

04 Jan '21

We are pleased to release v2.3.13. Please find it from locations below: https://dovecot.org/releases/2.3/dovecot-2.3.13.tar.gz https://dovecot.org/releases/2.3/dovecot-2.3.13.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-2020-24386: Specially crafted command can cause IMAP hibernate to allow logged in user to access other people's emails and filesystem information. * Metric filter and global event filter variable syntax changed to a SQL-like format. See https://doc.dovecot.org/configuration_manual/event_filter/ * auth: Added new aliases for %{variables}. Usage of the old ones is possible, but discouraged. * auth: Removed RPA auth mechanism, SKEY auth mechanism, NTLM auth mechanism and related password schemes. * auth: Removed passdb-sia, passdb-vpopmail and userdb-vpopmail. * auth: Removed postfix postmap socket + auth: Added new fields for auth server events. These fields are now also available for all auth events. See https://doc.dovecot.org/admin_manual/list_of_events/#authentication-server for details. + imap-hibernate: Added imap_client_hibernated, imap_client_unhibernated and imap_client_unhibernate_retried events. See https://doc.dovecot.org/admin_manual/list_of_events/ for details. + lib-index: Added new mail_index_recreated event. See https://doc.dovecot.org/admin_manual/list_of_events/#mail-index-recreated + lib-sql: Support TLS options for cassandra driver. This requires cpp-driver v2.15 (or later) to work reliably. + lib-storage: Missing $HasAttachment / $HasNoAttachment flags are now added to existing mails if mail_attachment_detection_option=add-flags and it can be done inexpensively. + login proxy: Added login_proxy_max_reconnects setting (default 3) to control how many reconnections are attempted. + login proxy: imap/pop3/submission/managesieve proxying now supports reconnection retrying on more than just connect() failure. Any error except a non-temporary authentication failure will result in reconnect attempts. - 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. - auth: SASL authentication PLAIN mechanism could be used to trigger read buffer overflow. However, this doesn't seem to be exploitable in any way. - auth: v2.3.11 regression: GSSAPI authentication fails because dovecot disallows NUL bytes for it. - dict: Process used too much CPU when iterating keys, because each key used a separate write() syscall. - doveadm-server: Crash could occur if logging was done outside command handling. For example http-client could have done debug logging afterwards, resulting in either segfault or Panic: file http-client.c: line 642 (http_client_context_close): assertion failed: (cctx->clients_list == NULL). - doveadm-server: v2.3.11 regression: Trying to connect to doveadm server process via starttls assert-crashed if there were no ssl=yes listeners: Panic: file master-service-ssl.c: line 22 (master_service_ssl_init): assertion failed: (service->ssl_ctx_initialized). - fts-solr: HTTP requests may have assert-crashed: Panic: file http-client-request.c: line 1232 (http_client_request_send_more): assertion failed: (req->payload_input != NULL) - imap: IMAP NOTIFY could crash with a segmentation fault due to a bad configuration that causes errors. Sending the error responses to the client can cause the segmentation fault. This can for example happen when several namespaces use the same mail storage location. - imap: IMAP NOTIFY used on a shared namespace that doesn't actually exist (e.g. public namespace for a nonexistent user) can crash with a panic: Panic: Leaked view for index /tmp/home/asdf/mdbox/dovecot.list.index: Opened in (null):0 - imap: IMAP session can crash with QRESYNC extension if many changes are done before asking for expunged mails since last sync. - imap: Process might hang indefinitely if client disconnects after sending some long-running commands pipelined, for example FETCH+LOGOUT. - lib-compress: Mitigate crashes when configuring a not compiled in compression. Errors with compression configuration now distinguish between not supported and unknown. - lib-compression: Using xz/lzma compression in v2.3.11 could have written truncated output in some situations. This would result in "Broken pipe" read errors when trying to read it back. - lib-compression: zstd compression could have crashed in some situations: Panic: file ostream.c: line 287 (o_stream_sendv_int): assertion failed: (!stream->blocking) - lib-dict: dict client could have crashed in some rare situations when iterating keys. - lib-http: Fix several assert-crashes in HTTP client. - lib-index: v2.3.11 regression: When mails were expunged at the same time as lots of new content was being saved to the cache (e.g. cache file was lost and is being re-filled) a deadlock could occur with dovecot.index.cache / dovecot.index.log. - lib-index: v2.3.11 regression: dovecot.index.cache file was being purged (rewritten) too often when it had a field that hadn't been accessed for over 1 month, but less than 2 months. Every cache file change caused a purging in this situation. - lib-mail: MIME parts were not returned correctly by Dovecot MIME parser. Regression caused by fixing CVE-2020-12100. - lib-mail: When max nested MIME parts were reached, IMAP BODYSTRUCTURE was written in a way that may have caused confusion for both IMAP clients and Dovecot itself when parsing it. The truncated part is now written out using application/octet-stream MIME type. - lib-mail: v2.3.11 regression: Mail delivery / parsing crashed when the 10000th MIME part was message/rfc822 (or if parent was multipart/digest): Panic: file message-parser.c: line 167 (message_part_append): assertion failed: (ctx->total_parts_count <= ctx->max_total_mime_parts). - lib-oauth2: Dovecot incorrectly required oauth2 server introspection reply to contain username with invalid token. - lib-ssl-iostream, lib-dcrypt: Fix building with OpenSSL that has deprecated APIs disabled. - lib-storage: When mail's size is different from the cached one (in dovecot.index.cache or Maildir S=size in the filename), this is handled by logging "Cached message size smaller/larger than expected" error. However, in some situations this also ended up crashing with: Panic: file istream.c: line 315 (i_stream_read_memarea): assertion failed: (old_size <= _stream->pos - _stream->skip). - lib-storage: v2.3 regression: Copying/moving mails was taking much more memory than before. This was mainly visible when copying/moving thousands of mails in a single transaction. - lib-storage: v2.3.11 regression: Searching messages assert-crashed (without FTS): Panic: file message-parser.c: line 174 (message_part_finish): assertion failed: (ctx->nested_parts_count > 0). - lib: Dovecot v2.3 moved signal handlers around in ioloops, causing more CPU usage than in v2.2. - lib: Fixed JSON parsing: '\' escape sequence may have wrongly resulted in error if it happened to be at read boundary. Any NUL characters and '\u0000' will now result in parsing error instead of silently truncating the data. - lmtp, submission: Server may hang if SSL client connection disconnects during the delivery. If this happened repeated, it could have ended up reaching process_limit and preventing any further lmtp/submission deliveries. - lmtp: Proxy does not always properly log TLS connection problems as errors; in some cases, only a debug message is logged if enabled. - lmtp: The LMTP service can hang when commands are pipelined. This can particularly occur when one command in the middle of the pipeline fails. One example of this occurs for proxied LMTP transactions in which the final DATA or BDAT command is pipelined after a failing RCPT command. - login-proxy: The login_source_ips setting has no effect, and therefore the proxy source IPs are not cycled through as they should be. - master: Process was using 100% CPU in some situations when a broken service was being throttled. - pop3-login: POP3 login would fail with "Input buffer full" if the initial response for SASL was too long. - stats: Crash would occur when generating openmetrics data for metrics using aggregating functions.

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Dovecot 2.3.11.4 - Centos 6&7 packages
by Aki Tuomi 26 Aug '20

26 Aug '20

Hi! We have pushed new versions for these packages that now support tcpwrappers. They were inadvertendly left out from last time, but now they have been restored. Sorry for the inconvenience. Regards, Aki Tuomi Open-Xchange oy

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Fix for pigeonhole 0.5.11
by Aki Tuomi 13 Aug '20

13 Aug '20

Hi! We have made a small fix to the Pigeonhole 0.5.11 tarball, please find the new tarball at https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.11.t… https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.11.t… The original released tarball is still available. The only change here is that the configure.ac file has correctly formatted version number. Regards, Aki Tuomi Open-Xchange oy

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CentOS 6 packages dropped
by Aki Tuomi 13 Aug '20

13 Aug '20

Hi! We are dropping CentOS 6 packages now that we have CentOS 8 packages available. 2.3.11.3 will be last version for which CentOS 6 packages are built for https://repo.dovecot.org. Regards, Aki Tuomi Open-Xchange oy

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CentOS 8 packages available
by Aki Tuomi 12 Aug '20

12 Aug '20

We are happy to announce that we have CentOS 8 packages available starting from v2.3.11.3. You can find these packages at https://repo.dovecot.org/ Regards, Aki Tuomi Open-Xchange oy

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