Add documents on CVE-2019-13917

[exim-website.git] / templates / static / doc / security / CVE-2019-13917.txt

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+CVE ID:     CVE-2019-13917
+OVE ID:     OVE-20190718-0006
+Date:       2019-07-18
+Credits:    Jeremy Harris
+Version(s): 4.85 up to and including 4.92
+Issue:      A local or remote attacker can execute programs with root
+            privileges - if you've an unusual configuration. For details
+           see below.
+
+Coordinated Release Date (CRD) for Exim 4.92.1:
+            Thu Jul 25 10:00:00 UTC 2019
+
+Contact:    exim-security@exim.org
+
+We released Exim 4.92.1. This is a security update based on 4.92.
+
+Conditions to be vulnerable
+===========================
+
+If your configuration uses the ${sort } expansion for items that can be
+controlled by an attacker (e.g. $local_part, $domain). The default
+config, as shipped by the Exim developers, does not contain ${sort }.
+
+Details
+=======
+
+The vulnerability is exploitable either remotely or locally and could
+be used to execute other programs with root privilege.  The ${sort }
+expansion re-evaluates its items.
+
+Mitigation
+==========
+
+Do not use ${sort } in your configuration.
+
+Fix
+===
+
+Install a fixed package supplied by your distribution.
+or download and build a fixed version:
+
+For release tarballs (exim-4.92.1):
+
+    http://ftp.exim.org/pub/exim/exim4/
+
+The package files are signed with a key from the developers
+key set: https://ftp.exim.org/pub/exim/Exim-Maintainers-Keyring.asc
+
+For the full Git repo:
+
+    https://git.exim.org/exim.git
+    https://github.com/Exim/exim    [mirror of the above]
+    - tag    exim-4.92.1
+    - branch exim-4.92.1+fixes
+
+The tagged commit is the officially released version. The tag is signed
+with a key from the developers keyset.  The +fixes branch isn't
+officially maintained, but contains the security fix *and* useful
+patches.  The relevant commit is signed with a key from the developers
+keyset. The old exim-4.92+fixes branch is being functionally replaced by
+the new exim-4.92.1+fixes branch.
+
+If you can't install the above versions, ask your package maintainer for
+a version containing the backported fix. On request and depending on our
+resources we will support you in backporting the fix.  (Please note,
+that Exim project officially doesn't support versions prior the current
+stable version.)
+
+Timeline
+========
+
+t0: Thu Jul 18 2019
+    - this notice to distros@vs.openwall.org and exim-maintainers@exim.org
+    - open limited access to our security Git repo. See below.
+
+t0+~4d: Mon Jul 22 10:00:00 UTC 2019 [NOW]
+    - heads-up notice to oss-security@lists.openwall.com,
+      exim-users@exim.org, and exim-announce@exim.org
+
+t0+~7d: Thu Jul 25 10:00:00 UTC 2019 [NOW]
+    - Coordinated relase date
+    - publish the patches in our official and public Git repositories
+      and the packages on our FTP server.