openSUSE-SU-2021:1225-1: moderate: Security update for dovecot23
openSUSE Security Update: Security update for dovecot23
______________________________________________________________________________
Announcement ID: openSUSE-SU-2021:1225-1
Rating: moderate
References: #1187418 #1187419 #1187420 SLE-19970
Cross-References: CVE-2020-28200 CVE-2021-29157
CVSS scores:
CVE-2020-28200 (NVD) : 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVE-2020-28200 (SUSE): 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVE-2021-29157 (SUSE): 6.7 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected Products:
openSUSE Leap 15.2
______________________________________________________________________________
An update that solves two vulnerabilities, contains one
feature and has one errata is now available.
Description:
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-indexin
g-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): 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.
* 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.
* Remove XZ/LZMA write support. Read support will be removed in future
release.
* 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
/#environment-variables 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).
- fts-tika: When tika server returns error, some mails cause 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))
- 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 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 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 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.
Update pigeonhole to version 0.5.15
* CVE-2020-28200: Sieve interpreter is not protected against abusive
scripts that claim excessive resource usage. Fixed by limiting the user
CPU time per single script execution and cumulatively over several
script runs within a configurable timeout period. Sufficiently large CPU
time usage is summed in the Sieve script binary and execution is blocked
when the sum exceeds the limit within that time. The block is lifted
when the script is updated after the resource usage times out.
(bsc#1187420) Attacker can DoS the mail delivery system (jsc#PM-2746)
ECO: Dovecot 2.3.15 version upgrade
* Disconnection log messages are now more standardized across services.
They also always now start with "Disconnected" prefix.
* managesieve: Commands pipelined together with and just after the
authenticate command cause these commands to be executed twice.
* 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.
This update was imported from the SUSE:SLE-15-SP2:Update update project.
Patch Instructions:
To install this openSUSE Security Update use the SUSE recommended installation methods
like YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:
- openSUSE Leap 15.2:
zypper in -t patch openSUSE-2021-1225=1
Package List:
- openSUSE Leap 15.2 (x86_64):
dovecot23-2.3.15-lp152.2.12.1
dovecot23-backend-mysql-2.3.15-lp152.2.12.1
dovecot23-backend-mysql-debuginfo-2.3.15-lp152.2.12.1
dovecot23-backend-pgsql-2.3.15-lp152.2.12.1
dovecot23-backend-pgsql-debuginfo-2.3.15-lp152.2.12.1
dovecot23-backend-sqlite-2.3.15-lp152.2.12.1
dovecot23-backend-sqlite-debuginfo-2.3.15-lp152.2.12.1
dovecot23-debuginfo-2.3.15-lp152.2.12.1
dovecot23-debugsource-2.3.15-lp152.2.12.1
dovecot23-devel-2.3.15-lp152.2.12.1
dovecot23-fts-2.3.15-lp152.2.12.1
dovecot23-fts-debuginfo-2.3.15-lp152.2.12.1
dovecot23-fts-lucene-2.3.15-lp152.2.12.1
dovecot23-fts-lucene-debuginfo-2.3.15-lp152.2.12.1
dovecot23-fts-solr-2.3.15-lp152.2.12.1
dovecot23-fts-solr-debuginfo-2.3.15-lp152.2.12.1
dovecot23-fts-squat-2.3.15-lp152.2.12.1
dovecot23-fts-squat-debuginfo-2.3.15-lp152.2.12.1
References:
https://www.suse.com/security/cve/CVE-2020-28200.html
https://www.suse.com/security/cve/CVE-2021-29157.html
https://bugzilla.suse.com/1187418
https://bugzilla.suse.com/1187419
https://bugzilla.suse.com/1187420
A dovecot23 security update has been released for openSUSE Leap 15.2.
