X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/72934ba73e5ac5fbd64b56dc684e3371a9651909..8120bdf12e2008621c0a3c4f965075528a0b0005:/doc/doc-txt/ChangeLog?ds=sidebyside diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index 00377b9ff..326895f6e 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -5,6 +5,454 @@ affect Exim's operation, with an unchanged configuration file. For new options, and new features, see the NewStuff file next to this ChangeLog. +Exim version 4.92.1 +------------------- + +JH/31 Avoid re-expansion in ${sort } expansion. (CVE-2019-13917, OVE-20190718-0006) + + +Since version 4.92 +------------------ + +JH/06 Fix buggy handling of autoreply bounce_return_size_limit, and a possible + buffer overrun for (non-chunking) other transports. + +JH/07 GnuTLS: Our use of late (post-handshake) certificate verification, under + TLS1.3, means that a server rejecting a client certificate is not visible + to the client until the first read of encrypted data (typically the + response to EHLO). Add detection for that case and treat it as a failed + TLS connection attempt, so that the normal retry-in-clear can work (if + suitably configured). + +JB/01 Bug 2375: fix expansions of 822 addresses having comments in local-part + and/or domain. Found and fixed by Jason Betts. + +JH/08 Add hardening against SRV & TLSA lookups the hit CNAMEs (a nonvalid + configuration). If a CNAME target was not a wellformed name pattern, a + crash could result. + +JH/09 Logging: Fix initial listening-on line for multiple ports for an IP when + the OS reports them interleaved with other addresses. + +JH/10 OpenSSL: Fix aggregation of messages. Previously, when PIPELINING was + used both for input and for a verify callout, both encrypted, SMTP + responses being sent by the server could be lost. This resulted in + dropped connections and sometimes bounces generated by a peer sending + to this system. + +JH/11 Harden plaintext authenticator against a badly misconfigured client-send + string. Previously it was possible to cause undefined behaviour in a + library routine (usually a crash). Found by "zerons". + +JH/12 Bug 2384: fix "-bP smtp_receive_timeout". Previously it returned no + output. + +JH/13 Bug 2386: Fix builds with Dane under LibreSSL 2.9.0 onward. Some old + API was removed, so update to use the newer ones. + + + +Exim version 4.92 +----------------- + +JH/01 Remove code calling the customisable local_scan function, unless a new + definition "HAVE_LOCAL_SCAN=yes" is present in the Local/Makefile. + +JH/02 Bug 1007: Avoid doing logging from signal-handlers, as that can result in + non-signal-safe functions being used. + +JH/03 Bug 2269: When presented with a received message having a stupidly large + number of DKIM-Signature headers, disable DKIM verification to avoid + a resource-consumption attack. The limit is set at twenty. + +JH/04 Add variables $arc_domains, $arc_oldest_pass for ARC verify. Fix the + report of oldest_pass in ${authres } in consequence, and separate out + some descriptions of reasons for verification fail. + +JH/05 Bug 2273: Cutthrough delivery left a window where the received messsage + files in the spool were present and unlocked. A queue-runner could spot + them, resulting in a duplicate delivery. Fix that by doing the unlock + after the unlink. Investigation by Tim Stewart. Take the opportunity to + add more error-checking on spoolfile handling while that code is being + messed with. + +PP/01 Refuse to open a spool data file (*-D) if it's a symlink. + No known attacks, no CVE, this is defensive hardening. + +JH/06 Bug 2275: The MIME ACL unlocked the received message files early, and + a queue-runner could start a delivery while other operations were ongoing. + Cutthrough delivery was a common victim, resulting in duplicate delivery. + Found and investigated by Tim Stewart. Fix by using the open message data + file handle rather than opening another, and not locally closing it (which + releases a lock) for that case, while creating the temporary .eml format + file for the MIME ACL. Also applies to "regex" and "spam" ACL conditions. + +JH/07 Bug 177: Make a random-recipient callout success visible in ACL, by setting + $sender_verify_failure/$recipient_verify_failure to "random". + +JH/08 When generating a selfsigned cert, use serial number 1 since zero is not + legitimate. + +JH/09 Bug 2274: Fix logging of cmdline args when starting in an unlinked cwd. + Previously this would segfault. + +JH/10 Fix ARC signing for case when DKIM signing failed. Previously this would + segfault. + +JH/11 Bug 2264: Exim now only follows CNAME chains one step by default. We'd + like zero, since the resolver should be doing this for us, But we need one + as a CNAME but no MX presence gets the CNAME returned; we need to check + that doesn't point to an MX to declare it "no MX returned" rather than + "error, loop". A new main option is added so the older capability of + following some limited number of chain links is maintained. + +JH/12 Add client-ip info to non-pass iprev ${authres } lines. + +JH/13 For receent Openssl versions (1.1 onward) use modern generic protocol + methods. These should support TLS 1.3; they arrived with TLS 1.3 and the + now-deprecated earlier definitions used only specified the range up to TLS + 1.2 (in the older-version library docs). + +JH/14 Bug 2284: Fix DKIM signing for body lines starting with a pair of dots. + +JH/15 Rework TLS client-side context management. Stop using a global, and + explicitly pass a context around. This enables future use of TLS for + connections to service-daemons (eg. malware scanning) while a client smtp + connection is using TLS; with cutthrough connections this is quite likely. + +JH/16 Fix ARC verification to do AS checks in reverse order. + +JH/17 Support a "tls" option on the ${readsocket } expansion item. + +JH/18 Bug 2287: Fix the protocol name (eg utf8esmtp) for multiple messages + using the SMTPUTF8 option on their MAIL FROM commands, in one connection. + Previously the "utf8" would be re-prepended for every additional message. + +JH/19 Reject MAIL FROM commands with SMTPUTF8 when the facility was not advertised. + Previously thery were accepted, resulting in issues when attempting to + forward messages to a non-supporting MTA. + +PP/02 Let -n work with printing macros too, not just options. + +JH/20 Bug 2296: Fix cutthrough for >1 address redirection. Previously only + one parent address was copied, and bogus data was used at delivery-logging + time. Either a crash (after delivery) or bogus log data could result. + Discovery and analysis by Tim Stewart. + +PP/03 Make ${utf8clean:} expansion operator detect incomplete final character. + Previously if the string ended mid-character, we did not insert the + promised '?' replacement. + +PP/04 Documentation: current string operators work on bytes, not codepoints. + +JH/21 Change as many as possible of the global flags into one-bit bitfields; these + should pack well giving a smaller memory footprint so better caching and + therefore performance. Group the declarations where this can't be done so + that the byte-sized flag variables are not interspersed among pointer + variables, giving a better chance of good packing by the compiler. + +JH/22 Bug 1896: Fix the envelope from for DMARC forensic reports to be possibly + non-null, to avoid issues with sites running BATV. Previously reports were + sent with an empty envelope sender so looked like bounces. + +JH/23 Bug 2318: Fix the noerror command within filters. It wasn't working. + The ignore_error flag wasn't being returned from the filter subprocess so + was not set for later routers. Investigation and fix by Matthias Kurz. + +JH/24 Bug 2310: Raise a msg:fail:internal event for each undelivered recipient, + and a msg:complete for the whole, when a message is manually removed using + -Mrm. Developement by Matthias Kurz, hacked on by JH. + +JH/25 Avoid fixed-size buffers for pathnames in DB access. This required using + a "Gnu special" function, asprintf() in the DB utility binary builds; I + hope that is portable enough. + +JH/26 Bug 2311: Fix DANE-TA verification under GnuTLS. Previously it was also + requiring a known-CA anchor certificate; make it now rely entirely on the + TLSA as an anchor. Checking the name on the leaf cert against the name + on the A-record for the host is still done for TA (but not for EE mode). + +JH/27 Fix logging of proxy address. Previously, a pointless "PRX=[]:0" would be + included in delivery lines for non-proxied connections, when compiled with + SUPPORT_SOCKS and running with proxy logging enabled. + +JH/28 Bug 2314: Fire msg:fail:delivery event even when error is being ignored. + Developement by Matthias Kurz, tweaked by JH. While in that bit of code, + move the existing event to fire before the normal logging of message + failure so that custom logging is bracketed by normal logging. + +JH/29 Bug 2322: A "fail" command in a non-system filter (file) now fires the + msg:fail:internal event. Developement by Matthias Kurz. + +JH/30 Bug 2329: Increase buffer size used for dns lookup from 2k, which was + far too small for todays use of crypto signatures stored there. Go all + the way to the max DNS message size of 64kB, even though this might be + overmuch for IOT constrained device use. + +JH/31 Fix a bad use of a copy function, which could be used to pointlessly + copy a string over itself. The library routine is documented as not + supporting overlapping copies, and on MacOS it actually raised a SIGABRT. + +JH/32 For main options check_spool_space and check_inode_space, where the + platform supports 64b integers, support more than the previous 2^31 kB + (i.e. more than 2 TB). Accept E, P and T multipliers in addition to + the previous G, M, k. + +JH/33 Bug 2338: Fix the cyrus-sasl authenticator to fill in the + $authenticated_fail_id variable on authentication failure. Previously + it was unset. + +JH/34 Increase RSA keysize of autogen selfsign cert from 1024 to 2048. RHEL 8.0 + OpenSSL didn't want to use such a weak key. Do for GnuTLS also, and for + more-modern GnuTLS move from GNUTLS_SEC_PARAM_LOW to + GNUTLS_SEC_PARAM_MEDIUM. + +JH/35 OpenSSL: fail the handshake when SNI processing hits a problem, server + side. Previously we would continue as if no SNI had been received. + +JH/36 Harden the handling of string-lists. When a list consisted of a sole + "<" character, which should be a list-separator specification, we walked + off past the nul-terimation. + +JH/37 Bug 2341: Send "message delayed" warning MDNs (restricted to external + causes) even when the retry time is not yet met. Previously they were + not, meaning that when (say) an account was over-quota and temp-rejecting, + and multiple senders' messages were queued, only one sender would get + notified on each configured delay_warning cycle. + +JH/38 Bug 2351: Log failures to extract envelope addresses from message headers. + +JH/39 OpenSSL: clear the error stack after an SSL_accept(). With anon-auth + cipher-suites, an error can be left on the stack even for a succeeding + accept; this results in impossible error messages when a later operation + actually does fail. + +AM/01 Bug 2359: GnuTLS: repeat lowlevel read and write operations while they + return error codes indicating retry. Under TLS1.3 this becomes required. + +JH/40 Fix the feature-cache refresh for EXPERIMENTAL_PIPE_CONNECT. Previously + it only wrote the new authenticators, resulting in a lack of tracking of + peer changes of ESMTP extensions until the next cache flush. + +JH/41 Fix the loop reading a message header line to check for integer overflow, + and more-often against header_maxsize. Previously a crafted message could + induce a crash of the recive process; now the message is cleanly rejected. + +JH/42 Bug 2366: Fix the behaviour of the dkim_verify_signers option. It had + been totally disabled for all of 4.91. Discovery and fix by "Mad Alex". + + +Exim version 4.91 +----------------- + +GF/01 DEFER rather than ERROR on redis cluster MOVED response. + When redis_servers is set to a list of > 1 element, and the Redis servers + in that list are in cluster configuration, convert the REDIS_REPLY_ERROR + case of MOVED into a DEFER case instead, thus moving the query onto the + next server in the list. For a cluster of N elements, all N servers must + be defined in redis_servers. + +GF/02 Catch and remove uninitialized value warning in exiqsumm + Check for existence of @ARGV before looking at $ARGV[0] + +JH/01 Replace the store_release() internal interface with store_newblock(), + which internalises the check required to safely use the old one, plus + the allocate and data copy operations duplicated in both (!) of the + extant use locations. + +JH/02 Disallow '/' characters in queue names specified for the "queue=" ACL + modifier. This matches the restriction on the commandline. + +JH/03 Fix pgsql lookup for multiple result-tuples with a single column. + Previously only the last row was returned. + +JH/04 Bug 2217: Tighten up the parsing of DKIM signature headers. Previously + we assumed that tags in the header were well-formed, and parsed the + element content after inspecting only the first char of the tag. + Assumptions at that stage could crash the receive process on malformed + input. + +JH/05 Bug 2215: Fix crash associated with dnsdb lookup done from DKIM ACL. + While running the DKIM ACL we operate on the Permanent memory pool so that + variables created with "set" persist to the DATA ACL. Also (at any time) + DNS lookups that fail create cache records using the Permanent pool. But + expansions release any allocations made on the current pool - so a dnsdb + lookup expansion done in the DKIM ACL releases the memory used for the + DNS negative-cache, and bad things result. Solution is to switch to the + Main pool for expansions. + While we're in that code, add checks on the DNS cache during store_reset, + active in the testsuite. + Problem spotted, and debugging aided, by Wolfgang Breyha. + +JH/06 Fix issue with continued-connections when the DNS shifts unreliably. + When none of the hosts presented to a transport match an already-open + connection, close it and proceed with the list. Previously we would + queue the message. Spotted by Lena with Yahoo, probably involving + round-robin DNS. + +JH/07 Bug 2214: Fix SMTP responses resulting from non-accept result of MIME ACL. + Previously a spurious "250 OK id=" response was appended to the proper + failure response. + +JH/08 The "support for" informational output now, which built with Content + Scanning support, has a line for the malware scanner interfaces compiled + in. Interface can be individually included or not at build time. + +JH/09 The "aveserver", "kavdaemon" and "mksd" interfaces are now not included + by the template makefile "src/EDITME". The "STREAM" support for an older + ClamAV interface method is removed. + +JH/10 Bug 2223: Fix mysql lookup returns for the no-data case (when the number of + rows affected is given instead). + +JH/11 The runtime Berkeley DB library version is now additionally output by + "exim -d -bV". Previously only the compile-time version was shown. + +JH/12 Bug 2230: Fix cutthrough routing for nonfirst messages in an initiating + SMTP connection. Previously, when one had more receipients than the + first, an abortive onward connection was made. Move to full support for + multiple onward connections in sequence, handling cutthrough connection + for all multi-message initiating connections. + +JH/13 Bug 2229: Fix cutthrough routing for nonstandard port numbers defined by + routers. Previously, a multi-recipient message would fail to match the + onward-connection opened for the first recipient, and cause its closure. + +JH/14 Bug 2174: A timeout on connect for a callout was also erroneously seen as + a timeout on read on a GnuTLS initiating connection, resulting in the + initiating connection being dropped. This mattered most when the callout + was marked defer_ok. Fix to keep the two timeout-detection methods + separate. + +JH/15 Relax results from ACL control request to enable cutthrough, in + unsupported situations, from error to silently (except under debug) + ignoring. This covers use with PRDR, frozen messages, queue-only and + fake-reject. + +HS/01 Fix Buffer overflow in base64d() (CVE-2018-6789) + +JH/16 Fix bug in DKIM verify: a buffer overflow could corrupt the malloc + metadata, resulting in a crash in free(). + +PP/01 Fix broken Heimdal GSSAPI authenticator integration. + Broken in f2ed27cf5, missing an equals sign for specified-initialisers. + Broken also in d185889f4, with init system revamp. + +JH/17 Bug 2113: Fix conversation closedown with the Avast malware scanner. + Previously we abruptly closed the connection after reading a malware- + found indication; now we go on to read the "scan ok" response line, + and send a quit. + +JH/18 Bug 2239: Enforce non-usability of control=utf8_downconvert in the mail + ACL. Previously, a crash would result. + +JH/19 Speed up macro lookups during configuration file read, by skipping non- + macro text after a replacement (previously it was only once per line) and + by skipping builtin macros when searching for an uppercase lead character. + +JH/20 DANE support moved from Experimental to mainline. The Makefile control + for the build is renamed. + +JH/21 Fix memory leak during multi-message connections using STARTTLS. A buffer + was allocated for every new TLS startup, meaning one per message. Fix + by only allocating once (OpenSSL) or freeing on TLS-close (GnuTLS). + +JH/22 Bug 2236: When a DKIM verification result is overridden by ACL, DMARC + reported the original. Fix to report (as far as possible) the ACL + result replacing the original. + +JH/23 Fix memory leak during multi-message connections using STARTTLS under + OpenSSL. Certificate information is loaded for every new TLS startup, + and the resources needed to be freed. + +JH/24 Bug 2242: Fix exim_dbmbuild to permit directoryless filenames. + +JH/25 Fix utf8_downconvert propagation through a redirect router. Previously it + was not propagated. + +JH/26 Bug 2253: For logging delivery lines under PRDR, append the overall + DATA response info to the (existing) per-recipient response info for + the "C=" log element. It can have useful tracking info from the + destination system. Patch from Simon Arlott. + +JH/27 Bug 2251: Fix ldap lookups that return a single attribute having zero- + length value. Previously this would segfault. + +HS/02 Support Avast multiline protoocol, this allows passing flags to + newer versions of the scanner. + +JH/28 Ensure that variables possibly set during message acceptance are marked + dead before release of memory in the daemon loop. This stops complaints + about them when the debug_store option is enabled. Discovered specifically + for sender_rate_period, but applies to a whole set of variables. + Do the same for the queue-runner and queue-list loops, for variables set + from spool message files. Do the same for the SMTP per-message loop, for + certain variables indirectly set in ACL operations. + +JH/29 Bug 2250: Fix a longstanding bug in heavily-pipelined SMTP input (such + as a multi-recipient message from a mailinglist manager). The coding had + an arbitrary cutoff number of characters while checking for more input; + enforced by writing a NUL into the buffer. This corrupted long / fast + input. The problem was exposed more widely when more pipelineing of SMTP + responses was introduced, and one Exim system was feeding another. + The symptom is log complaints of SMTP syntax error (NUL chars) on the + receiving system, and refused recipients seen by the sending system + (propating to people being dropped from mailing lists). + Discovered and pinpointed by David Carter. + +JH/30 The (EXPERIMENTAL_DMARC) variable $dmarc_ar_header is withdrawn, being + replaced by the ${authresults } expansion. + +JH/31 Bug 2257: Fix pipe transport to not use a socket-only syscall. + +HS/03 Set a handler for SIGTERM and call exit(3) if running as PID 1. This + allows proper process termination in container environments. + +JH/32 Bug 2258: Fix spool_wireformat in combination with LMTP transport. + Previously the "final dot" had a newline after it; ensure it is CR,LF. + +JH/33 SPF: remove support for the "spf" ACL condition outcome values "err_temp" + and "err_perm", deprecated since 4.83 when the RFC-defined words + "temperror" and "permerror" were introduced. + +JH/34 Re-introduce enforcement of no cutthrough delivery on transports having + transport-filters or DKIM-signing. The restriction was lost in the + consolidation of verify-callout and delivery SMTP handling. + Extend the restriction to also cover ARC-signing. + +JH/35 Cutthrough: for a final-dot response timeout (and nonunderstood responses) + in defer=pass mode supply a 450 to the initiator. Previously the message + would be spooled. + +PP/02 DANE: add dane_require_tls_ciphers SMTP Transport option; if unset, + tls_require_ciphers is used as before. + +HS/03 Malware Avast: Better match the Avast multiline protocol. Add + "pass_unscanned". Only tmpfails from the scanner are written to + the paniclog, as they may require admin intervention (permission + denied, license issues). Other scanner errors (like decompression + bombs) do not cause a paniclog entry. + +JH/36 Fix reinitialisation of DKIM logging variable between messages. + Previously it was possible to log spurious information in receive log + lines. + +JH/37 Bug 2255: Revert the disable of the OpenSSL session caching. This + triggered odd behaviour from Outlook Express clients. + +PP/03 Add util/renew-opendmarc-tlds.sh script for safe renewal of public + suffix list. + +JH/38 DKIM: accept Ed25519 pubkeys in SubjectPublicKeyInfo-wrapped form, + since the IETF WG has not yet settled on that versus the original + "bare" representation. + +JH/39 Fix syslog logging for syslog_timestamp=no and log_selector +millisec. + Previously the millisecond value corrupted the output. + Fix also for syslog_pid=no and log_selector +pid, for which the pid + corrupted the output. + + Exim version 4.90 ----------------- @@ -160,7 +608,7 @@ JH/26 Fix DKIM bug: when the pseudoheader generated for signing was exactly line, the header hash was calculated to an incorrect value thanks to the (relaxed) space the fold became. -HS/02 Fix Bug 2130: large writes from the transport subprocess where chunked +HS/02 Fix Bug 2130: large writes from the transport subprocess were chunked and confused the parent. JH/27 Fix SOCKS bug: an unitialized pointer was deref'd by the transport process @@ -193,6 +641,19 @@ JH/33 Downgrade an unfound-list name (usually a typo in the config file) from something like "domains check lookup or other defer". The SMTP 451 message is still "Temporary local problem". +JH/34 Bug 2199: Fix a use-after-free while reading smtp input for header lines. + A crafted sequence of BDAT commands could result in in-use memory beeing + freed. CVE-2017-16943. + +HS/03 Bug 2201: Fix checking for leading-dot on a line during headers reading + from SMTP input. Previously it was always done; now only done for DATA + and not BDAT commands. CVE-2017-16944. + +JH/35 Bug 2201: Flush received data in BDAT mode after detecting an error fatal + to the message (such as an overlong header line). Previously this was + not done and we did not exit BDAT mode. Followon from the previous item + though a different problem. + Exim version 4.89 -----------------