X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/25fa08681506fa01e9e15406f9d35a853da19476..f3ebb786e451da973560f1c9d8cdb151d25108b5:/doc/doc-txt/ChangeLog diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index 785d59bed..78cb12720 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -5,6 +5,155 @@ 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 4.93 +----------------- + +JH/01 OpenSSL: With debug enabled output keying information sufficient, server + side, to decode a TLS 1.3 packet capture. + +JH/02 OpenSSL: Suppress the sending of (stateful) TLS1.3 session tickets. + Previously the default library behaviour applied, sending two, each in + its own TCP segment. + +JH/03 Debug output for ACL now gives the config file name and line number for + each verb. + +JH/04 The default received_header_text now uses the RFC 8314 tls cipher clause. + +JH/05 DKIM: ensure that dkim_domain elements are lowercased before use. + +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. + +JH/14 Bug 1891: Close the log file if receiving a non-smtp message, without + any timeout set, is taking a long time. Previously we would hang on to a + rotated logfile "forever" if the input was arriving with long gaps + (a previous attempt to fix addressed lack, for a long time, of initial + input). + +HS/01 Bug 2390: Use message_id for tempfile creation to avoid races in a + shared (NFS) environment. The length of the tempfile name is now + 4 + 16 ("hdr.$message_exim_id") which might break on file + systems which restrict the file name length to lower values. + (It was "hdr.$pid".) + +HS/01 Bug 2390: Use message_id for tempfile creation to avoid races in a + shared (NFS) environment. + +HS/02 Bug 2392: exigrep does case sensitive *option* processing (as it + did for all versions <4.90). Notably -M, -m, --invert, -I may be + affected. + +JH/15 Use unsigned when creating bitmasks in macros, to avoid build errors + on some platforms for bit 31. + +JH/16 GnuTLS: rework ciphersuite strings under recent library versions. Thanks + to changes apparently associated with TLS1.3 handling some of the APIs + previously used were either nonfunctional or inappropriate. Strings + like TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM__AEAD:256 + and TLS1.2:ECDHE_SECP256R1__RSA_SHA256__AES_128_CBC__SHA256:128 replace + the previous TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256 . + This affects log line X= elements, the $tls_{in,out}_cipher variables, + and the use of specific cipher names in the encrypted= ACL condition. + +JH/17 OpenSSL: the default openssl_options now disables ssl_v3. + +JH/18 GnuTLS: fix $tls_out_ocsp under hosts_request_ocsp. Previously the + verification result was not updated unless hosts_require_ocsp applied. + +JH/19 Bug 2398: fix listing of a named-queue. Previously, even with the option + queue_list_requires_admin set to false, non-admin users were denied the + facility. + +JH/20 Bug 2389: fix server advertising of usable certificates, under GnuTLS in + directory-of-certs mode. Previously they were advertised despite the + documentation. + +JH/21 The smtp transport option "hosts_noproxy_tls" is now unset by default. + A single TCP connection by a client will now hold a TLS connection open + for multiple message deliveries, by default. Previoud the default was to + not do so. + +JH/22 The smtp transport option "hosts_try_dane" now enables all hosts by + default. If built with the facility, DANE will be used. The facility + SUPPORT_DANE is now enabled in the prototype build Makefile "EDITME". + +JH/23 The build default is now for TLS to be included; the SUPPORT_TLS define + is replaced with DISABLE_TLS. Either USE_GNUTLS or (the new) USE_OPENSSL + must be defined and you must still, unless you define DISABLE_TLS, manage + the the include-dir and library-file requirements that go with that + choice. Non-TLS builds are still supported. + +JH/24 Fix duplicated logging of peer name/address, on a transport connection- + reject under TFO. + +JH/25 The smtp transport option "hosts_try_fastopen" now enables all hosts by + default. If the platform supports and has the facility enabled, it will + be requested on all coneections. + +JH/26 The PIPE_CONNECT facility is promoted from experimental status and is now + controlled by the build-time option SUPPORT_PIPE_CONNECT. + +PP/01 Unbreak heimdal_gssapi, broken in 4.92. + +JH/27 Bug 2404: Use the main-section configuration option "dsn_from" for + success-DSN messages. Previously the From: header was always the default + one for these; the option was ignored. + +JH/28 Fix the timeout on smtp response to apply to the whole response. + Previously it was reset for every read, so a teergrubing peer sending + single bytes within the time limit could extend the connection for a + long time. Credit to Qualsys Security Advisory Team for the discovery. + +JH/29 Fix DSN Final-Recipient: field. Previously it was the post-routing + delivery address, which leaked information of the results of local + forwarding. Change to the original envelope recipient address, per + standards. + +JH/30 Bug 2411: Fix DSN generation when RFC 3461 failure notification is + requested. Previously not bounce was generated and a log entry of + error ignored was made. + +JH/31 Avoid re-expansion in ${sort } expansion. (CVE-2019-13917) + +JH/32 Introduce a general tainting mechanism for values read from the input + channel, and values derived from them. Refuse to expand any tainted + values, to catch one form of exploit. + + Exim version 4.92 ----------------- @@ -180,6 +329,20 @@ JH/39 OpenSSL: clear the error stack after an SSL_accept(). With anon-auth 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 -----------------