X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/c9771b0f607127d89018dd79bab6febb14db3d6d..d0e4bb183c038fe38ee249c1bd096f49120e908a:/doc/doc-txt/ChangeLog diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index ac5354c73..4287e41e5 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -2,10 +2,336 @@ 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 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 trtying 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 broking 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 vriable + 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. + +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 messmage IDs) from +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. @@ -136,6 +462,21 @@ JH/30 Fix string_copyn() for limit greater than actual string length. 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 -----------------