Security update for dovecot23
This update for dovecot23 fixes the following issues:
Update dovecot to version 2.3.15 (jsc#SLE-19970):
Security issues fixed:
- CVE-2021-29157: Dovecot does not correctly escape kid and azp fields in
JWT tokens. This may be used to supply attacker controlled keys to
validate tokens, if attacker has local access. (bsc#1187418)
Local attacker can login as any user and access their emails
- CVE-2021-33515: On-path attacker could have injected plaintext commands
before STARTTLS negotiation that would be executed after STARTTLS
finished with the client. (bsc#1187419)
Attacker can potentially steal user credentials and mails
- Disconnection log messages are now more standardized across services.
They also always now start with 'Disconnected' prefix.
- Dovecot now depends on libsystemd for systemd integration.
- Removed support for Lua 5.2. Use version 5.1 or 5.3 instead.
- config: Some settings are now marked as 'hidden'. It's discouraged to
change these settings. They will no longer be visible in doveconf
output, except if they have been changed or if doveconf -s parameter
is used. See https://doc.dovecot.org/settings/advanced/ for details.
- imap-compress: Compression level is now algorithm specific.
See https://doc.dovecot.org/settings/plugin/compress-plugin/
- indexer-worker: Convert 'Indexed' info logs to an event named
'indexer_worker_indexing_finished'. See
https://doc.dovecot.org/admin_manual/list_of_events/#indexer-worker-indexing-finished
+ Add TSLv1.3 support to min_protocols.
+ Allow configuring ssl_cipher_suites. (for TLSv1.3+)
+ acl: Add acl_ignore_namespace setting which allows to entirely ignore
ACLs for the listed namespaces.
+ imap: Support official RFC8970 preview/snippet syntax. Old methods of
retrieving preview information via IMAP commands ('SNIPPET and PREVIEW
with explicit algorithm selection') have been deprecated.
+ imapc: Support INDEXPVT for imapc storage to enable private
message flags for cluster wide shared mailboxes.
+ lib-storage: Add new events: mail_opened, mail_expunge_requested,
mail_expunged, mail_cache_lookup_finished. See
https://doc.dovecot.org/admin_manual/list_of_events/#mail
+ zlib, imap-compression, fs-compress: Support compression levels that
the algorithm supports. Before, we would allow hardcoded value between
1 to 9 and would default to 6. Now we allow using per-algorithm value
range and default to whatever default the algorithm specifies.
- *-login: Commands pipelined together with and just after the authenticate
command cause these commands to be executed twice. This applies to all
protocols that involve user login, which currently comprises of imap,
pop3, submisision and managesieve.
- *-login: Processes are supposed to disconnect the oldest non-logged in
connection when process_limit was reached. This didn't actually happen
with the default 'high-security mode' (with service_count=1) where each
connection is handled by a separate process.
- *-login: When login process reaches client/process limits, oldest
client connections are disconnected. If one of these was still doing
anvil lookup, this caused a crash. This could happen only if the login
process limits were very low or if the server was overloaded.
- Fixed building with link time optimizations (-flto).
- auth: Userdb iteration with passwd driver does not always return all
users with some nss drivers.
- dsync: Shared INBOX not synced when 'mail_shared_explicit_inbox' was
disabled. If a user has a shared mailbox which is another user's INBOX,
dsync didn't include the mailbox in syncing unless explicit naming is
enabled with 'mail_shared_explicit_inbox' set to 'yes'.
- dsync: Shared namespaces were not synced with '-n' flag.
- dsync: Syncing shared INBOX failed if mail_attribute_dict was not set.
If a user has a shared mailbox that is another user's INBOX, dsync
failed to export the mailbox if mail attributes are disabled.
- fts-solr, fts-tika: Using both Solr FTS and Tika may have caused HTTP
requests to assert-crash: Panic: file http-client-request.c: line 1232
(http_client_request_send_more): assertion failed: (req->payload_input != NULL)
- fts-tika: 5xx errors returned by Tika server as indexing failures.
However, Tika can return 5xx for some attachments every time.
So the 5xx error should be retried once, but treated as success if it
happens on the retry as well. v2.3 regression.
- fts-tika: v2.3.11 regression: Indexing messages with fts-tika may have
resulted in Panic: file message-parser.c: line 802 (message_parser_deinit_from_parts):
assertion failed: (ctx->nested_parts_count == 0 || i_stream_have_bytes_left(ctx->input))
- imap: SETMETADATA could not be used to unset metadata values.
Instead NIL was handled as a 'NIL' string. v2.3.14 regression.
- imap: IMAP BINARY FETCH crashes at least on empty base64 body:
Panic: file index-mail-binary.c: line 358 (blocks_count_lines):
