X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/059e42a76436f2639142a0fda905c14b1873d0e3..e94c0fe42ba93c2643d44046f2f3a269bae41290:/doc/doc-txt/ChangeLog?ds=sidebyside diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index 3995eb05d..37cc3b77d 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -2,6 +2,614 @@ This document describes *changes* to previous versions, that might 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 4.98 +----------------- + +JH/01 Use fewer forks & execs for sending many messages to a single host. + By passing back more info from the transport to the delivery process, + we can loop there. A two-phase queue run will benefit, particularly for + mailinglist and smarthost cases. + +JH/02 Add transaction support for hintsdbs. The providers supported are tdb and + sqlite. Transactions are used for the wait-transport and retry DBs. + They imply locking internal to the DB. We no longer need a separate + lockfile, can keep the DB handle open for extended periods, yet + potentially benefit from concurrency on non-conflicting record uses. + +JH/03 With dkim_verify_minimal, avoid calling the DKIM ACL after the first + good verify. + +JH/04 Remove the docs and support scripts dealing with conversion of Exim + version 3 installations. + +JH/05 Fix hintsdb support for dbmjz when compiled using sqlite3. Previously + the backend support assumed keys would be simple C strings, but dbmjz + uses keys with embedded NUL bytes. The builtin hintsdb use is unaffected, + but installations using dbmjz will need to rebuild those DBs. + +JH/06 Bug 1141: When operating a continued-connection transport, verify that + the interface option, if specified, evaluates to match the connection. + Previously, a queued message for the same host was sent without checking. + +JH/07 Bug 3106: Fix coding in SPA authenticator. A macro argument was not + properly parenthesized, resulting in a logic error. While the simple + fix was provided by Andrew Aitchison, the over-large code block resulting + from this macro made me want to replace it with a real function so more + extensive rework becamse needed. + +JH/08 The output of "exim -bV" now includes lookup types built as dynamic-load + modules. + +JH/09 Not a change, but worthy of note: There is no test coverage of the + heimdall-gssapi authenticator driver. It does build, though with (on at + least one platform) library version conflicts with the gsasl auth + driver). Confidence in its operation is lacking. + +JH/10 Bug 3108: On platforms not providing strchrnul() [OpenBSD] supply a proper + prototype (as well as implementaton). Previously, a return type "int" + was assumed, resulting in type-conversion bugs when int and pointer had + different size. This resulted in crashes while processing DKIM signatures + of received messages. Identification and fix from Qualys Security. + +JH/11 Lookups built as dynamic-load modules which support a single lookup + type are now only loaded if required by the config. Previously all lookup + modules present in the modules directory were loaded; this now applies + only to those supporting multiple types. + +JH/12 Bug 3112: Fix logging of config-file position for "obsolete lookup + syntax". Previously, the end of the top-level file was reported. + +JH/13 Bug 3120: Fix parsing of DKIM pubkey DNS record. Previously a crafted + record could crash the meesage recieve process. Investigation by + Maxim Galaganov. + +JH/14 Bug 3116: Fix crash in dkim signing. On kernels supporting immutable + memory segments, a write was done into one when a constant string was + configured for a transport's dkim private key. + +JH/15 Disallow tainted metadata in lists. + - Change-of-separator prefixes are handled specially when they are + explicit text; only the remainder of the list is expanded. A change-of- + separator resulting from expansion will not take effect if tainted. + - Elements starting with a plus-sign (named-list inclusion, + case-interpretation etc) and (hostlist) @[] (et al) are not handled + specially and are still operative at this time - but warnings are logged; + if any of these are needed in a list with a tainted element (which taints + the entire list at string-expansion time) then a named-list can be used + for that element. + - Exclamation-marks ("!" signifying negation) are not checked for taint + at this time. + +Exim version 4.98 +----------------- + +JH/01 Support list of dkim results in the dkim_status ACL condition, making + it more usable in the data ACL. + +JH/02 Bug 3040: Handle error on close of the spool data file during reception. + Previously This was only logged, on the assumption that errors would be + seen for a previous fflush(). However, a fuse filesystem has been + reported as showing this an error for the fclose(). The spool is now in + an uncertain state, and we have logged and responded acceptance. Change + this to respond with a temp-reject, wipe spoolfiles, and log the error + detail. + +JH/03 Bug 3030: Fix handling of DNS servfail respons for DANE TLSA. When hit + during a recipient verify callout, a QUIT command was attempted on the + now-closed callout channel, causing a paniclog entry. + +JH/04 Bug 3039: Fix handling of of an empty log_reject_target, with + a connection_reject log_selector, under tls_on_connect. Previously + with this combination, when the connect ACL rejected, a spurious + paniclog entry was made. + +JH/05 Fix TLS resumption for TLS-on-connect. This was broken by the advent + of loadbalancer-detection for resumption, in 4.96 - which tries to + use the EHLO response. SMTPS does not have one at the time it is starting + TLS. Change the default for the smtp transport host_name_extract option + to be a static string, for TLS-on-connect cases; meaning that resumption + will always be attempted (unless deliberately overriden). + +JH/06 Bug 3054: Fix dnsdb lookup for a TXT record with multiple chunks, with a + chunk-separator specification. This was broken by hardening introduced + for Bug 3031. + +JH/07 Bug 3050: Fix -bp for old message_id format spoolfiles. Previously it + included the -H with the id; this also messed up exiqgrep. + +JH/08 Bug 3056: Tighten up parsing of DKIM DNS records. Previously, whitespace + was not properly skipped and empty elements would cause mis-parsing. + Tighten parsing of DKIM header records. Previously, all but lowercase + alpha chars would be ignored in potential tag names. + +JH/09 Bug 3057: Add heuristic for spotting mistyped IPv6 addresses in lists + being searched. Previously we only had one for IPv4 addresses. Per the + documentation, the error results by default in a no-match result for the + list. It is logged if the unknown_in_list log_selector is used. + +JH/10 Bug 3058: Ensure that a failing expansion in a router "set" option defers + the routing operation. Previously it would silently stop routing the + message. + +JH/11 Bug 3046: Fix queue-runs. Previously, the arrivel of a notification or + info-request event close in time to a scheduled run timer could result in + the latter being missed, and no further queue scheduled runs being + initiated. This ouwld be more likely on high-load systems. + +JH/12 Refuse to accept a line "dot, LF" as end-of-DATA unless operating in + LF-only mode (as detected from the first header line). Previously we did + accept that in (normal) CRLF mode; this has been raised as a possible + attack scenario (under the name "smtp smuggling"). + +JH/13 Add an fdatasync call for the received message data file in spool, before + loggging reception and sending the SMTP ack. Previously we only flushed + the stdio buffer so there was still the possibility of a disk error. + +JH/14 Bug 3061: Avoid a split log line when trying to rewrite a malformed + address. Previously, for the last address in a header line (commonly + there is only one) the terminating newline was part of the logged + information. + +JH/15 Bug 3061: Ensure a log line is written for a malformed address in a + header, when parsing for address-qualification. Previously one was only + written if there were rewrite rules. + +JH/16 Two-phase queue runs are now reported in the daemon startup log line and + in exiwhat output. + +JH/17 Bug 3064: Fix combination of "-q -R ". Introduction of + the multiple-queue-runners facility for 4.97 broke this, giving only a + one-time run of the queue. + +JH/18 Bug 3068: Log a warning for use of deprecated syntax in query-style + lookups. + +JH/19 Fix TLS startup. When the last expansion done before the initiation of a + TLS session resulted in a forced-fail, a misleading error was logged for + the expansino of tls_certificates. This would affect the common case of + that option being set (main-section options) but not having any variable + parts. It could also potentially affect tls_privatekeys. The underlyding + coding errors go back to 4.90 but were only exposed in 4.97. + +JH/20 Bug 3047: A recent (somewhere between 10.34 and 10.42) version of the + pcre2 library starting allocating 20kB rather than 112 bytes per match + call, which broke the 2GB total limitation on Exim's memory management + when a user had over 104207 messages stored and the appendfile + maildir_quota_directory_regex option is in use. Release the allocated + memory every thosand files to avoid this. + The same issue arises with the ACL regex condition, which is applied + to every line of a received message. + +JH/21 Bug 3059: Fix crash in smtp transport. When running for a message for + which all recipients had been handled (itself an issue) a null-pointer + deref was done on trying to write a retry record. Fix that by counting + the outstanding recipients before trying to transmit the message. + The situation arose for a second MX try within a transport run, when the + first had perm-rejected a recipient (the only one for the connection, in + the case seen) during pipelining, and then closed the TCP connection. + The transport classified that as an I/O error, leaving the message + outstanding but having marked up the recipient as dealt-with. It then + tried another MX because of the I/O error. Fix this by converting the + message-level status to ok if there was a close but all recipients were + dealt with. Thanks to Wolfgand Breyha for debug runs. + +JH/22 The ESMTP_LIMITS facility (RFC 9422) is promoted from experimental status + and is now controlled by the build-time option DISABLE_ESMTP_LIMITS. + +JH/23 Bug 3066: Avoid leaking lookup database credentials to log. + +JH/24 Bug 3081: Fix a delivery process crash. When the router "errors_to" + option specified a fixed address, later rewriting on that address would + trip on the configuration data being readonly. Instead of modifying + in-place, copy data. Found and fixed by Peter Benie. + +JH/25 Bug 3079: Fix crash in dbmnz. When a key was present for zero-length + data a null pointer was followed. Find and testcase by Sebastian Bugge. + +JH/26 Fix encoding for an AUTH parameter on a MAIL FROM command. Previously + decimal 127 chars were not encoded, and lowercase hex was used for + encoded values. Outstanding since at least 1999. + +JH/27 Fix crash in logging. When a message with a large number of recipients + had been received, and logging of recipients is enabled, the buffer used + for logging could reach limit. A read using a null pointer would then + be done, resulting in a crash of the receiving process before an SMTP + ACK for the message was returned to the sending system. Duplicate + messages were created as a result. + Find and debug help by Mateusz Krawczyk + +JH/28 Bug 3086: Fix exinext for ipv6. Change the format of keys in the retry + DB, wrapping transport record bare-ip "host names" and ipv6 + "host addresses" in square-brackets. This makes the parsing that + exinext does more reliable. + +JH/29 Bug 3087: Fix SRS encode. A zero-length quoted element in the local-part + would cause a crash. + +JH/30 Bug 3029: Avoid feeding Resent-From: to DMARC. + +JH/31 Bug 3027: For -bh / -bhc tests change to using the compressed form of + ipv6 addresses for the sender. Previously the uncompressed form was used, + and if used in textual form this would result in behavior difference + versus non-bh. + +JH/32 Bug 3096: MAIL before HELO/EHLO, where required by hosts_require_helo, is + now classed as a protocol error and subject to smtp_max_synprot_errors. + +JH/33 Bug 2994: A subdir dsearch lookup should permit a directory name that starts + ".." and has following characters. + +JH/34 Fix delivery ordering for 2-phase queue run combined with + queue_run_in_order. + +JH/35 Bug 3099: fix parsing of MIME filename= split over multiple paramemters. + Previously the $mime_filename variable would have an incorrect value. + While in the code, extend coverage to name= which previously was only + supported for single parameters, despite also filling in $mime_filename. + + +Exim version 4.97 +----------------- + +JH/01 The hosts_connection_nolog main option now also controls "no MAIL in + SMTP connection" log lines. + +JH/02 Option default value updates: + - queue_fast_ramp (main) true (was false) + - remote_max_parallel (main) 4 (was 2) + +JH/03 Cache static regex pattern compilations, for use by ACLs. + +JH/04 Bug 2903: avoid exit on an attempt to rewrite a malformed address. + Make the rewrite never match and keep the logging. Trust the + admin to be using verify=header-syntax (to actually reject the message). + +JH/05 Follow symlinks for placing a watch on TLS creds files. This means + (under Linux) we watch the dir containing the final file; previously + it would be the dir with the first symlink. We still do not monitor + the entire path. + +JH/06 Check for bad chars in rDNS for sender_host_name. The OpenBSD (at least) + dn_expand() is happy to pass them through. + +JH/07 OpenSSL Fix auto-reload of changed server OCSP proof. Previously, if + the file with the proof had an unchanged name, the new proof(s) were + loaded on top of the old ones (and nover used; the old ones were stapled). + +JH/08 Bug 2915: Fix use-after-free for $regex variables. Previously when + more than one message arrived in a single connection a reference from + the earlier message could be re-used. Often a sigsegv resulted. + These variables were introduced in Exim 4.87. + Debug help from Graeme Fowler. + +JH/09 Fix ${filter } for conditions that modify $value. Previously the + modified version would be used in construction the result, and a memory + error would occur. + +JH/10 GnuTLS: fix for (IOT?) clients offering no TLS extensions at all. + Find and fix by Jasen Betts. + +JH/11 OpenSSL: fix for ancient clients needing TLS support for versions earlier + than TLSv1,2, Previously, more-recent versions of OpenSSL were permitting + the systemwide configuration to override the Exim config. + +HS/01 Bug 2728: Introduce EDITME option "DMARC_API" to work around incompatible + API changes in libopendmarc. + +JH/12 Bug 2930: Fix daemon startup. When started from any process apart from + pid 1, in the normal "background daemon" mode, having to drop process- + group leadership also lost track of needing to create listener sockets. + +JH/13 Bug 2929: Fix using $recipients after ${run...}. A change made for 4.96 + resulted in the variable appearing empty. Find and fix by Ruben Jenster. + +JH/14 Bug 2933: Fix regex substring match variables for null matches. Since 4.96 + a capture group which obtained no text (eg. "(abc)*" matching zero + occurrences) could cause a segfault if the corresponding $ was + expanded. + +JH/15 Fix argument parsing for ${run } expansion. Previously, when an argument + included a close-brace character (eg. it itself used an expansion) an + error occurred. + +JH/16 Move running the smtp connect ACL to before, for TLS-on-connect ports, + starting TLS. Previously it was after, meaning that attackers on such + ports had to be screened using the host_reject_connection main config + option. The new sequence aligns better with the STARTTLS behaviour, and + permits defences against crypto-processing load attacks, even though it + is strictly an incompatible change. + Also, avoid sending any SMTP fail response for either the connect ACL + or host_reject_connection, for TLS-on-connect ports. + +JH/17 Permit the ACL "encrypted" condition to be used in a HELO/EHLO ACL, + Previously this was not permitted, but it makes reasonable sense. + While there, restore a restriction on using it from a connect ACL; given + the change JH/16 it could only return false (and before 4.91 was not + permitted). + +JH/18 Fix a fencepost error in logging. Previously (since 4.92) when a log line + was exactly sized compared to the log buffer, a crash occurred with the + misleading message "bad memory reference; pool not found". + Found and traced by Jasen Betts. + +JH/19 Bug 2911: Fix a recursion in DNS lookups. Previously, if the main option + dns_again_means_nonexist included an element causing a DNS lookup which + itself returned DNS_AGAIN, unbounded recursion occurred. Possible results + included (though probably not limited to) a process crash from stack + memory limit, or from excessive open files. Replace this with a paniclog + whine (as this is likely a configuration error), and returning + DNS_NOMATCH. + +JH/20 Bug 2954: (OpenSSL) Fix setting of explicit EC curve/group. Previously + this always failed, probably leading to the usual downgrade to in-clear + connections. + +JH/21 Fix TLSA lookups. Previously dns_again_means_nonexist would affect + SERVFAIL results, which breaks the downgrade resistance of DANE. Change + to not checking that list for these lookups. + +JH/22 Bug 2434: Add connection-elapsed "D=" element to more connection + closure log lines. + +JH/23 Fix crash in string expansions. Previously, if an empty variable was + immediately followed by an expansion operator, a null-indirection read + was done, killing the process. + +JH/24 Bug 2997: When built with EXPERIMENTAL_DSN_INFO, bounce messages can + include an SMTP response string which is longer than that supported + by the delivering transport. Alleviate by wrapping such lines before + column 80. + +JH/25 Bug 2827: Restrict size of References: header in bounce messages to 998 + chars (RFC limit). Previously a limit of 12 items was made, which with + a not-impossible References: in the message being bounced could still + be over-large and get stopped in the transport. + +JH/26 For a ${readsocket } in TLS mode, send a TLS Close Alert before the TCP + close. Previously a bare socket close was done. + +JH/27 Fix ${srs_encode ..}. Previously it would give a bad result for one day + every 1024 days. + +JH/28 Bug 2996: Fix a crash in the smtp transport. When finding that the + message being considered for delivery was already being handled by + another process, and having an SMTP connection already open, the function + to close it tried to use an uninitialized variable. This would afftect + high-volume sites more, especially when running mailing-list-style loads. + Pollution of logs was the major effect, as the other process delivered + the message. Found and partly investigated by Graeme Fowler. + +JH/29 Change format of the internal ID used for message identification. The old + version only supported 31 bits for a PID element; the new 64 (on systems + which can use Base-62 encoding, which is all currently supported ones + but not Darwin (MacOS) or Cygwin, which have case-insensitive filesystems + and must use Base-36). The new ID is 23 characters rather than 16, and is + visible in various places - notably logs, message headers, and spool file + names. Various of the ancillary utilities also have to know the format. + As well as the expanded PID portion, the sub-second part of the time + recorded in the ID is expanded to support finer precision. Theoretically + this permits a receive rate from a single comms channel of better than the + previous 2000/sec. + The major timestamp part of the ID is not changed; at 6 characters it is + usable until about year 3700. + Updating from previously releases is fully supported: old-format spool + files are still usable, and the utilities support both formats. New + message will use the new format. The one hints-DB file type which uses + message-IDs (the transport wait- DB) will be discarded if an old-format ID + is seen; new ones will be built with only new-format IDs. + Optionally, a utility can be used to convert spool files from old to new, + but this is only an efficiency measure not a requirement for operation + Downgrading from new to old requires running a provided utility, having + first stopped all operations. This will convert any spool files from new + back to old (losing time-precision and PID information) and remove any + wait- hints databases. + +JH/30 Bug 3006: Fix handling of JSON strings having embedded commas. Previously + we treated them as item separators when parsing for a list item, but they + need to be protected by the doublequotes. While there, add handling for + backslashes. + +JH/31 Bug 2998: Fix ${utf8clean:...} to disallow UTF-16 surrogate codepoints. + Found and fixed by Jasen Betts. No testcase for this as my usual text + editor insists on emitting only valid UTF-8. + +JH/32 Fix "tls_dhparam = none" under GnuTLS. At least with 3.7.9 this gave + a null-indirection SIGSEGV for the receive process. + +JH/33 Fix free for live variable $value created by a ${run ...} expansion during + -bh use. Internal checking would spot this and take a panic. + +JH/34 Bug 3013: Fix use of $recipients within arguments for ${run...}. + In 4.96 this would expand to empty. + +JH/35 Bug 3014: GnuTLS: fix expiry date for an auto-generated server + certificate. Find and fix by Andreas Metzler. + +JH/36 Add ARC info to DMARC hostory records. + +JH/37 Bug 3016: Avoid sending DSN when message was accepted under fakereject + or fakedefer. Previously the sender could discover that the message + had in fact been accepted. + +JH/38 Taint-track intermediate values from the peer in multi-stage authentation + sequences. Previously the input was not noted as being tainted; notably + this resulted in behaviour of LOGIN vs. PLAIN being inconsistent under + bad coding of authenticators. + +JH/39 Bug 3023: Fix crash induced by some combinations of zero-length strings + and ${tr...}. Found and diagnosed by Heiko Schlichting. + +JH/40 Bug 2999: Fix a possible OOB write in the external authenticator, which + could be triggered by externally-supplied input. Found by Trend Micro. + CVE-2023-42115 + +JH/41 Bug 3000: Fix a possible OOB write in the SPA authenticator, which could + be triggered by externally-controlled input. Found by Trend Micro. + CVE-2023-42116 + +JH/42 Bug 3001: Fix a possible OOB read in the SPA authenticator, which could + be triggered by externally-controlled input. Found by Trend Micro. + CVE-2023-42114 + +JH/43 Bug 2903: avoid exit on an attempt to rewrite a malformed address. + Make the rewrite never match and keep the logging. Trust the + admin to be using verify=header-syntax (to actually reject the message). + +JH/44 Bug 3033: Harden dnsdb lookups against crafted DNS responses. + CVE-2023-42219 + +HS/02 Fix string_is_ip_address() CVE-2023-42117 (Bug 3031) + + +Exim version 4.96 +----------------- + +JH/01 Move the wait-for-next-tick (needed for unique message IDs) from + after reception to before a subsequent reception. This should + mean slightly faster delivery, and also confirmation of reception + to senders. + +JH/02 Move from using the pcre library to pcre2. The former is no longer + being developed or supported (by the original developer). + +JH/03 Constification work in the filters module required a major version + bump for the local-scan API. Specifically, the "headers_charset" + global which is visible via the API is now const and may therefore + not be modified by local-scan code. + +JH/04 Fix ClamAV TCP use under FreeBSD. Previously the OS-specific shim for + sendfile() didi not account for the way the ClamAV driver code called it. + +JH/05 Bug 2819: speed up command-line messages being read in. Previously a + time check was being done for every character; replace that with one + per buffer. + +JH/06 Bug 2815: Fix ALPN sent by server under OpenSSL. Previously the string + sent was prefixed with a length byte. + +JH/07 Change the SMTP feature name for pipelining connect to be compliant with + RFC 5321. Previously Dovecot (at least) would log errors during + submission. + +JH/08 Remove stripping of the binaries from the FreeBSD build. This was added + in 4.61 without a reason logged. Binaries will be bigger, which might + matter on diskspace-constrained systems, but debug is easier. + +JH/09 Fix macro-definition during "-be" expansion testing. The move to + write-protected store for macros had not accounted for these runtime + additions; fix by removing this protection for "-be" mode. + +JH/10 Convert all uses of select() to poll(). FreeBSD 12.2 was found to be + handing out large-numbered file descriptors, violating the usual Unix + assumption (and required by Posix) that the lowest possible number will be + allocated by the kernel when a new one is needed. In the daemon, and any + child procesees, values higher than 1024 (being bigger than FD_SETSIZE) + are not useable for FD_SET() [and hence select()] and overwrite the stack. + Assorted crashes happen. + +JH/11 Fix use of $sender_host_name in daemon process. When used in certain + main-section options or in a connect ACL, the value from the first ever + connection was never replaced for subsequent connections. Found by + Wakko Warner. + +JH/12 Bug 2838: Fix for i32lp64 hard-align platforms. Found for SPARC Linux, + though only once PCRE2 was introduced: the memory accounting used under + debug offset allocations by an int, giving a hard trap in early startup. + Change to using a size_t. Debug and fix by John Paul Adrian Glaubitz. + +JH/13 Bug 2845: Fix handling of tls_require_ciphers for OpenSSL when a value + with underbars is given. The write-protection of configuration introduced + in 4.95 trapped when normalisation was applied to an option not needing + expansion action. + +JH/14 Bug 1895: TLS: Deprecate RFC 5114 Diffie-Hellman parameters. + +JH/15 Fix a resource leak in *BSD. An off-by-one error resulted in the daemon + failing to close the certificates directory, every hour or any time it + was touched. + +JH/16 Debugging initiated by an ACL control now continues through into routing + and transport processes. Previously debugging stopped any time Exim + re-execs, or for processing a queued message. + +JH/17 The "expand" debug selector now gives more detail, specifically on the + result of expansion operators and items. + +JH/18 Bug 2751: Fix include_directory in redirect routers. Previously a + bad comparison between the option value and the name of the file to + be included was done, and a mismatch was wrongly identified. + 4.88 to 4.95 are affected. + +JH/19 Support for Berkeley DB versions 1 and 2 is withdrawn. + +JH/20 When built with NDBM for hints DB's check for nonexistence of a name + supplied as the db file-pair basename. Previously, if a directory + path was given, for example via the autoreply "once" option, the DB + file.pag and file.dir files would be created in that directory's + parent. + +JH/21 Remove the "allow_insecure_tainted_data" main config option and the + "taint" log_selector. These were previously deprecated. + +JH/22 Fix static address-list lookups to properly return the matched item. + Previously only the domain part was returned. + +JH/23 Bug 2864: FreeBSD: fix transport hang after 4xx/5xx response. Previously + the call into OpenSSL to send a TLS Close was being repeated; this + resulted in the library waiting for the peer's Close. If that was never + sent we waited forever. Fix by tracking send calls. + +JH/24 The ${run} expansion item now expands its command string elements after + splitting. Previously it was before; the new ordering makes handling + zero-length arguments simpler. The old ordering can be obtained by + appending a new option "preexpand", after a comma, to the "run". + +JH/25 Taint-check exec arguments for transport-initiated external processes. + Previously, tainted values could be used. This affects "pipe", "lmtp" and + "queryprogram" transport, transport-filter, and ETRN commands. + The ${run} expansion is also affected: in "preexpand" mode no part of + the command line may be tainted, in default mode the executable name + may not be tainted. + +JH/26 Fix CHUNKING on a continued-transport. Previously the usabliility of + the the facility was not passed across execs, and only the first message + passed over a connection could use BDAT; any further ones using DATA. + +JH/27 Support the PIPECONNECT facility in the smtp transport when the helo_data + uses $sending_ip_address and an interface is specified. + Previously any use of the local address in the EHLO name disabled + PIPECONNECT, the common case being to use the rDNS of it. + +JH/28 OpenSSL: fix transport-required OCSP stapling verification under session + resumption. Previously verify failed because no certificate status is + passed on the wire for the restarted session. Fix by using the recorded + ocsp status of the stored session for the new connection. + +JH/29 TLS resumption: the key for session lookup in the client now includes + more info that a server could potentially use in configuring a TLS + session, avoiding oferring mismatching sessions to such a server. + Previously only the server IP was used. + +JH/30 Fix string_copyn() for limit greater than actual string length. + Previously the copied amount was the limit, which could result in a + overlapping memcpy for newly allocated destination soon after a + source string shorter than the limit. Found/investigated by KM. + +JH/31 Bug 2886: GnuTLS: Do not free the cached creds on transport connection + close; it may be needed for a subsequent connection. This caused a + SEGV on primary-MX defer. Found/investigated by Gedalya & Andreas. + +JH/32 Fix CHUNKING for a second message on a connection when the first was + rejected. Previously we did not reset the chunking-offered state, and + erroneously rejected the BDAT command. Investigation help from + Jesse Hathaway. + +JH/33 Fis ${srs_encode ...} to handle an empty sender address, now returning + an empty address. Previously the expansion returned an error. + +HS/01 Bug 2855: Handle a v4mapped sender address given us by a frontending + proxy. Previously these were misparsed, leading to paniclog entries. + Exim version 4.95 ----------------- @@ -38,7 +646,7 @@ JH/06 Bug 2594: Change the name used for certificate name checks in the smtp JH/07 Bug 2597: Fix a resource leak. Using a lookup in obtaining a value for smtp_accept_max_per_host allocated resources which were not released when the limit was exceeded. This eventually crashed the daemon. Fix - by adding a relase action in that path. + by adding a release action in that path. JH/08 Bug 2598: Fix verify ACL condition. The options for the condition are expanded; previously using tainted values was rejected. Fix by using @@ -75,7 +683,7 @@ JH/15 Bug 2620: Fix "spam" ACL condition. Previously, tainted values for the JH/16 Bug 2615: Fix pause during message reception, on systems that have been suspended/resumed. The Linux CLOCK_MONOTONIC does not account for time - spent suspended, ignoring the Posix definition. Previously we assumed + spent suspended, ignoring the POSIX definition. Previously we assumed it did and a constant offset from real time could be used as a correction. Change to using the same clock source for the start-of-message and the post-message next-tick-wait. Also change to using CLOCK_BOOTTIME if it @@ -83,12 +691,12 @@ JH/16 Bug 2615: Fix pause during message reception, on systems that have been JH/17 Bug 2295: Fix DKIM signing to always semicolon-terminate. Although the RFC says it is optional some validators care. The missing char was not - intended but triggered by a line-wrap alignement. Discovery and fix by + intended but triggered by a line-wrap alignment. Discovery and fix by Guillaume Outters, hacked on by JH. JH/18 Bug 2617: Fix a taint trap in parse_fix_phrase(). Previously when the name being quoted was tainted a trap would be taken. Fix by using - dynamicaly created buffers. The routine could have been called by a + dynamically created buffers. The routine could have been called by a rewrite with the "h" flag, by using the "-F" command-line option, or by using a "name=" option on a control=submission ACL modifier. @@ -146,15 +754,15 @@ JH/29 Bug 2675: add outgoing-interface I= element to deferred "==" log lines, JH/30 Bug 2677: fix matching of long addresses. Since 4.93 a limit of 256 was applied. This resulted, if any header-line rewrite rules were configured, - in a panic-log trigerrable by sending a message with a long address in - a header. Fix by increaing the arbitrary limit to larger than a single + in a panic-log triggerable by sending a message with a long address in + a header. Fix by increasing the arbitrary limit to larger than a single (dewrapped) 5322 header line maximum size. JH/31 The ESMTP option name advertised for the SUPPORT_EARLY_PIPE build option is changed from X_PIPE_CONNECT to PIPE_CONNECT. This is in line with RFC 6648 which deprecates X- options in protocols as a general practice. Changeover between the implementations is handled by the mechanisms - alrready coded. + already coded. JH/32 Bug 2599: fix delay of delivery to a local address where there is also a remote which uses callout/hold. Previously the local was queued. @@ -182,7 +790,7 @@ JH/37 Enforce the expected size, for fixed-size records read from hints-DB JH/38 When logging an AUTH failure, as server, do not include sensitive information. Previously, the credentials would be included if given - as part of the AUTH command line and an ACL denied authentidcation. + as part of the AUTH command line and an ACL denied authentication. JH/39 Bug 2691: fix $local_part_data. When the matching list element referred to a file, bad data was returned. This likely also affected @@ -214,7 +822,7 @@ JH/44 Bug 2701: Fix list-expansion of dns_ipv4_lookup. Previously, it did mx_fail_domains. JH/45 Use a (new) separate store pool-pair for DKIM verify working data. - Previously the permanent pool was used, so the sore could not be freed. + Previously the permanent pool was used, so the store could not be freed. This meant a connection with many messages would use continually-growing memory. @@ -230,7 +838,111 @@ JH/48 Use a less bogus-looking filename for a temporary used for DH-parameters for GnuTLS. Previously the name started "%s" which, while not a bug, looked as if if might be one. +JH/49 Bug 2710: when using SOCKS for additional messages after the first (a + "continued connection") make the $proxy_* variables available. Previously + the information was not passed across the exec() call for subsequent + transport executions. This also mean that the log lines for the + messages can show the proxy information. + +JH/50 Bug 2672: QT elements in log lines, unless disabled, now exclude the + receive time. With modern systems the difference is significant. + The historical behaviour can be restored by disabling (a new) log_selector + "queue_time_exclusive". + +JH/51 Taint-check ACL line. Previously, only filenames (for out-of-line ACL + content) were specifically tested for. Now, also cover expansions + resulting in ACL names and inline ACL content. + +JH/52 Fix ${ip6norm:} operator. Previously, any trailing line text was dropped, + making it unusable in complex expressions. + +JH/53 Bug 2743: fix immediate-delivery via named queue. Previously this would + fail with a taint-check on the spoolfile name, and leave the message + queued. + +HS/01 Enforce absolute PID file path name. + +HS/02 Handle SIGINT as we handle SIGTERM: terminate the Exim process. + +PP/01 Add a too-many-bad-recipients guard to the default config's RCPT ACL. + +PP/02 Bug 2643: Correct TLS DH constants. + A missing NUL termination in our code-generation tool had led to some + incorrect Diffie-Hellman constants in the Exim source. + Reported by kylon94, code-gen tool fix by Simon Arlott. + +PP/03 Impose security length checks on various command-line options. + Fixes CVE-2020-SPRSS reported by Qualys. + +PP/04 Fix Linux security issue CVE-2020-SLCWD and guard against PATH_MAX + better. Reported by Qualys. + +PP/05 Fix security issue CVE-2020-PFPSN and guard against cmdline invoker + providing a particularly obnoxious sender full name. + Reported by Qualys. + +PP/06 Fix CVE-2020-28016 (PFPZA): Heap out-of-bounds write in parse_fix_phrase() + +PP/07 Refuse to allocate too little memory, block negative/zero allocations. + Security guard. +PP/08 Change default for recipients_max from unlimited to 50,000. + +PP/09 Fix security issue with too many recipients on a message (to remove a + known security problem if someone does set recipients_max to unlimited, + or if local additions add to the recipient list). + Fixes CVE-2020-RCPTL reported by Qualys. + +PP/10 Fix security issue in SMTP verb option parsing + Fixes CVE-2020-EXOPT reported by Qualys. + +PP/11 Fix security issue in BDAT state confusion. + Ensure we reset known-good where we know we need to not be reading BDAT + data, as a general case fix, and move the places where we switch to BDAT + mode until after various protocol state checks. + Fixes CVE-2020-BDATA reported by Qualys. + +HS/03 Die on "/../" in msglog file names + +QS/01 Creation of (database) files in $spool_dir: only uid=0 or the uid of + the Exim runtime user are allowed to create files. + +QS/02 PID file creation/deletion: only possible if uid=0 or uid is the Exim + runtime user. + +QS/03 When reading the output from interpreted forward files we do not + pass the pipe between the parent and the interpreting process to + executed child processes (if any). + +QS/04 Always die if requested from internal logging, even is logging is + disabled. + +JH/54 DMARC: recent versions of the OpenDMARC library appear to have broken + the API; compilation noo longer completes with DMARC support included. + This affects 1.4.1-1 on Fedora 33 (1.3.2-3 is functional); and has + been reported on other platforms. + +JH/55 TLS: as server, reject connections with ALPN indicating non-smtp use. + +JH/56 Make the majority of info read from config files readonly, for defence-in- + depth against exploits. Suggestion by Qualys. + Not supported on Solaris 10. + +JH/57 Fix control=fakreject for a custom message containing tainted data. + Previously this resulted in a log complaint, due to a re-expansion present + since fakereject was originally introduced. + +JH/58 GnuTLS: Fix certextract expansion. If a second modifier after a tag + modifier was given, a loop resulted. + +JH/59 DKIM: Fix small-message verification under TLS with chunking. If a + pipelined SMTP command followed the BDAT LAST then it would be + incorrectly treated as part of the message body, causing a verification + fail. + +JH/60 Bug 2805: Fix logging of domain-literals in Message_ID: headers. They + require looser validation rules than those for 821-level addresses, + which only permit IP addresses. Exim version 4.94 @@ -656,6 +1368,10 @@ JH/47 ARC: fix crash in signing, triggered when a configuration error failed to do ARC verification. The Authentication-Results: header line added by the configuration then had no ARC item. +JH/48 Bug 2784: fix shutdown=no in the ${readsocket) expansion item. Previously + an incorrect mode was used for reading the result, resulting in it being + ignored. + Exim version 4.92 -----------------