Docs: add note on DKIM vs. tpt modifying headers

[exim.git] / doc / doc-txt / ChangeLog

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index c36718d7efeab21ea28d542ab21f47790442208e..20dcd13488f69b0ad139d57b4274ed53ee7c954f 100644 (file)
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -2,33 +2,123 @@ 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.
 
 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 4.96.1
--------------------
-
-This is a security release.
-
-JH/01 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
+Exim version 4.98
+-----------------

 
 

-JH/02 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/01 Support list of dkim results in the dkim_status ACL condition, making
+      it more usable in the data ACL.

 
 

-JH/03 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/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/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/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.

 
 

-Exim version 4.next
--------------------
+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.

 
 

-HS/01 Fix string_is_ip_address() CVE-2023-42117 (Bug 3031)
+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<period> -R <recipients>". 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.

 
 
 Exim version 4.97
 
 
 Exim version 4.97


@@ -117,7 +207,7 @@ JH/18 Fix a fencepost error in logging.  Previously (since 4.92) when a log line
 
 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
 
 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

-      iteslf returned DNS_AGAIN, unbounded recursion occurred.  Possible results
+      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
       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


@@ -222,14 +312,32 @@ JH/38 Taint-track intermediate values from the peer in multi-stage authentation
 JH/39 Bug 3023: Fix crash induced by some combinations of zero-length strings
       and ${tr...}.  Found and diagnosed by Heiko Schlichting.
 
 JH/39 Bug 3023: Fix crash induced by some combinations of zero-length strings
       and ${tr...}.  Found and diagnosed by Heiko Schlichting.
 

-JH/40 Support list of dkim results in the dkim_status ACL condition, making
-      it more usable in the data ACL.
+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
 -----------------
 
 
 
 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.
       after reception to before a subsequent reception.  This should
       mean slightly faster delivery, and also confirmation of reception
       to senders.