From: Heiko Schlittermann (HS12-RIPE) <hs@schlittermann.de>
Date: Thu, 5 Sep 2019 16:37:58 +0000 (+0200)
Subject: Add CVE-2019-15846 document
X-Git-Url: https://git.exim.org/exim-website.git/commitdiff_plain/3c78bd2faccc7516a63a0fc1dac75b8c5256adf6

Add CVE-2019-15846 document
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diff --git a/templates/static/doc/security/CVE-2019-15846.txt b/templates/static/doc/security/CVE-2019-15846.txt
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+CVE ID:     CVE-2019-15846
+Date:       2019-09-02 (CVE assigned)
+Credits:    Zerons <sironhide0null@gmail.com> for the initial report
+            Qualys https://www.qualys.com/ for the analysis
+Version(s): all versions up to and including 4.92.1
+Issue:      A local or remote attacker can execute programs with root
+            privileges.
+
+Conditions to be vulnerable
+===========================
+
+If your Exim server accepts TLS connections, it is vulnerable. This does
+not depend on the TLS libray, so both, GnuTLS and OpenSSL are affected.
+
+Details
+=======
+
+The vulnerability is exploitable by sending a SNI ending in a
+backslash-null sequence during the initial TLS handshake. The exploit
+exists as a POC.
+
+For more details see doc/doc-txt/cve-2019-15846/ in the source code
+repository.
+
+Mitigation
+==========
+
+Do not offer TLS. (This mitigation is not recommended.)
+
+Fix
+===
+
+Download and build a fixed version:
+
+    Tarballs: https://ftp.exim.org/pub/exim/exim4/
+    Git:      https://github.com/Exim/exim.git
+              - tag    exim-4.92.2
+              - branch exim-4.92.2+fixes
+
+The tagged commit is the officially released version. The +fixes branch
+isn't officially maintained, but contains the security fix *and* useful
+fixes.
+
+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,
+the Exim project officially doesn't support versions prior the current
+stable version.)
+
+Timeline
+--------
+
+2019-07-21  - Report from Zerons to security@exim.org
+....-..-..  - Analysis by Qualys
+            - Fix and tests
+2019-09-02  - CVE assigned
+2019-09-03  - Details to distros@vs.openwall.org, exim-maintainers@exim.org
+            - Grant access to the security repo
+2019-09-04  - Heads-Up to oss-security@lists.openwall.com, exim-users@exim.org
+2019-09-06  - 10.00 UTC Coordinated Release Date
+            - Disclosure to oss-security, exim-users, public repositories