[exim] Exim 4.82.1 Security Release

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Author: Todd Lyons
To: Exim Dev, Exim Users, Exim Announce
Subject: [exim] Exim 4.82.1 Security Release
Exim release 4.82.1 is now available from the primary ftp site:
* ftp://ftp.exim.org/pub/exim/exim4/exim-4.82.1.tar.gz
* ftp://ftp.exim.org/pub/exim/exim4/exim-4.82.1.tar.bz2

This is a SECURITY release, addressing a CRITICAL remote code execution
flaw in Exim version 4.82 (only) when built with DMARC support (an
experimental feature, not on by default). This release is identical to
4.82 except for the small change needed to plug the security hole. The
next release of Exim will, eventually, be 4.83, which will include the
many improvements we've made since 4.82, but which will require the
normal release candidate baking process before release.

You are not vulnerable unless you built Exim with EXPERIMENTAL_DMARC.

This issue is known by the CVE ID of CVE-2014-2957, was reported
directly to the Exim development team by a company which uses Exim for
its mail server. An Exim developer constructed a small patch which
altered the way the contents of the From header is parsed by converting
it to use safer and better internal functions. It was applied and
tested on a production server for correctness. We were notified of the
vulnerability Friday night, created a patch on Saturday, applied and
tested it on Sunday, notified OS packagers on Monday/Tuesday, and are
releasing on the next available work day, which is Wednesday.

This is why we have made the smallest feasible changes to prevent
exploit: we want this chagne to be as safe as possible to expedite into
production (if the packages were built with DMARC).


The primary ftp server is in Cambridge, England. There is a list of
mirrors in:
* http://www.exim.org/mirmon/ftp_mirrors.html

The master ftp server is ftp.exim.org, which is also accessible at

The distribution files are signed with Todd Lyons' PGP key
0xC4F4F94804D29EBA (uid tlyons@??? with a strong relationship to
prior release engineer Phil Pennock's PGP key 0x403043153903637F). This
key should be available from all modern PGP keyservers. Please use your
own discretion in assessing what trust paths you might have to this uid;
the "Release verification" section of the Release Policy might be of

* http://wiki.exim.org/EximReleasePolicy

The detached ASCII signature files are in the same directory as the
tarbundles. The SHA256 hashes for the distribution files are at the end
of this email.

The distribution contains an ASCII copy of the 4.82.1 manual and
other documents. Other formats of the documentation are also
* ftp://ftp.exim.org/pub/exim/exim4/exim-html-4.82.1.tar.gz
* ftp://ftp.exim.org/pub/exim/exim4/exim-pdf-4.82.1.tar.gz
* ftp://ftp.exim.org/pub/exim/exim4/exim-postscript-4.82.1.tar.gz

The .bz2 versions of these tarbundles are also available.

The only change is this bugfix, thus no ChangeLog-4.82.1 file.
There are no new features, thus no NewStuff-4.82.1 file.


Release Checksums

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f9c69153b1da3ef854c73ac98ec5bcef842438c5630819bc2287dec869bd039d exim-postscript-4.82.1.tar.bz2
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1d3c1f1c4bdb66c89b82d3925578f4ab29c87f2af4e3e1c1096366bafdfad000 exim-postscript-4.82.1.tar.gz
067a55860b3da017c6d9f23e8df944e9aca2d73f1de65f44b1557f4878f64cb1 exim-postscript-4.82.1.tar.gz.asc

- -- Todd Lyons, pp The Exim Maintainers.