Fedora 34: 2021-208340a217 Critical: Dovecot Token Injection Issue

Dovecot is an IMAP server for Linux/UNIX-like systems, written with security

primarily in mind. It also contains a small POP3 server. It supports mail

in either of maildir or mbox formats.

The SQL drivers and authentication plug-ins are in their subpackages.

* 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. * CVE-2021-33515: On-path

attacker could have injected plaintext commands before STARTTLS

negotiation that would be executed after STARTTLS finished with the

client. * 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/2.3/settings/advanced/ for

details. * imap-compress: Compression level is now algorithm specific.

See * indexer-worker:

Convert "Indexed" info logs to an event named

"indexer_worker_indexing_finished". See

https://doc.dovecot.org/2.3/admin_manual/list_of_events/ + 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/2.3/admin_manual/list_of_events/ + 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): assertion failed:

(block_count == 0 || block_idx+1 == block_count) - imap: If IMAP client using

the NOTIFY command was disconnected while sending FETCH notifications

to the client, imap could crash with Panic: Trying to close mailbox

INBOX with open transactions. - imap: Using IMAP COMPRESS extension can cause

IMAP connection to hang when IMAP commands are >8 kB long. - imapc: If

remote server sent BYE but didn't immediately disconnect, it could

cause infinite busy-loop. - lib-index: Corrupted cache record size in

dovecot.index.cache file could have caused a crash (segfault) when

accessing it. - lib-oauth2: JWT token time validation now works correctly with

32-bit systems. - lib-ssl-iostream: Checking hostnames against an SSL

certificate was case-sensitive. - lib-storage: Corrupted mime.parts in

dovecot.index.cache may have resulted in Panic: file imap-bodystructure.c: line 206 (part_write_body): assertion failed: (text

== ((part->flags & MESSAGE_PART_FLAG_TEXT) != 0)) - lib-storage: Index

rebuilding (e.g. via doveadm force-resync) didn't preserve the "hdr-pop3-uidl" header. Because of this, the next pop3 session could have

accessed all of the emails' metadata to read their POP3 UIDL (opening

dbox files). - listescape: When using the listescape plugin and a shared

namespace the plugin didn't work properly anymore resulting in errors

like: "Invalid mailbox name: Name must not have '/' character." -lmtp: Connection crashes if connection gets disconnected due to

multiple bad commands and the last bad command is BDAT. - lmtp: The Dovecot-specific LMTP parameter XRCPTFORWARD was blindly forwarded by LMTP

proxy without checking that the backend has support. This caused a

command parameter error from the backend if it was running an older

Dovecot release. This could only occur in more complex setups where

the message was proxied twice; when the proxy generated the

XRCPTFORWARD parameter itself the problem did not occur, so this only

happened when it was forwarded. - lmtp: The LMTP proxy crashes with a panic when

the remote server replies with an error while the mail is still being

forwarded through a DATA/BDAT command. - lmtp: Username may have been

missing from lmtp log line prefixes when it was performing

autoexpunging. - master: Dovecot would incorrectly fail with haproxy 2.0.14

service checks. - master: Systemd service: Dovecot announces readiness

for accepting connections earlier than it should. The following

environment variables are now imported automatically and can be

omitted from import_environment setting: NOTIFY_SOCKET LISTEN_FDS

LISTEN_PID. - master: service { process_min_avail } was launching processes too

slowly when master was forking a lot of processes. - util: Make the health-check.sh example script POSIX shell compatible.

* Mon Jun 21 2021 Michal Hlavinka - 1:2.3.15-1

- dovecot updated to 2.3.15, pigeonhole updated to 0.5.15

- 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.

- CVE-2021-33515: On-path attacker could have injected plaintext commands

before STARTTLS negotiation that would be executed after STARTTLS

finished with the client.

- Add TSLv1.3 support to min_protocols.

- Allow configuring ssl_cipher_suites. (for TLSv1.3+)

* Wed May 19 2021 Pete Walter - 1:2.3.14-4

- Rebuild for ICU 69

* Wed May 19 2021 Pete Walter - 1:2.3.14-3

- Rebuild for ICU 69

* Mon May 10 2021 Jeff Law - 1:2.3.14-2

- Re-enable LTO

[ 1 ] Bug #1974392 - CVE-2021-29157 dovecot: local attacker can login as any user and access their emails [fedora-all]

https://bugzilla.redhat.com/show_bug.cgi?id=1974392

[ 2 ] Bug #1974393 - CVE-2021-33515 dovecot: plaintext commands injection [fedora-all]

https://bugzilla.redhat.com/show_bug.cgi?id=1974393

[ 3 ] Bug #1974394 - CVE-2020-28200 dovecot: insufficient protection against excessive resource usage allows for a DoS [fedora-all]

https://bugzilla.redhat.com/show_bug.cgi?id=1974394

su -c 'dnf upgrade --advisory FEDORA-2021-208340a217' at the command

line. For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

All packages are signed with the Fedora Project GPG key. More details on the

GPG keys used by the Fedora Project can be found at

https://fedoraproject.org/security/

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