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Bug#961579: marked as done (stretch-pu: package erlang/1:19.2.1+dfsg-2+deb9u3)

Your message dated Sat, 18 Jul 2020 13:07:00 +0100
with message-id <b8d89cdfeeda7b6d1ef96a8706a20f9525c2151b.camel@adam-barratt.org.uk>
and subject line Closing requests for fixes included in 9.13 point release
has caused the Debian Bug report #961579,
regarding stretch-pu: package erlang/1:19.2.1+dfsg-2+deb9u3
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
961579: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961579
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: release.debian.org
Severity: normal
Tags: stretch
User: release.debian.org@packages.debian.org
Usertags: pu

Hi release team!

Recently, a weak ciphers vulnerability was discovered in the Yaws web server,
and reported as CVE-2020-12872 (see [1] and [2]).
It turnes out that Yaws uses the default ciphers provided by Erlang, so I
think it's better to fix this bug there. If we consider only Erlang packages
in stretch, buster, bullseye/sid then only the version in stretch is
vulnerable, so I'd like to propose an update for it.

The proposed patch is attached. It's a minimal patch which jusr removes the
3DES based ciphers from the offered list for TLS v1.0. The later Erlang
versions do just that - remove these ciphers from the list.

If the patch is okay then I'll upload the fixed version.

[1] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12872
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961422

-- System Information:
Debian Release: 10.4
  APT prefers stable-debug
  APT policy: (500, 'stable-debug'), (500, 'proposed-updates'), (500, 'oldoldstable'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental'), (1, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-9-amd64 (SMP w/12 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

diff -Nru erlang-19.2.1+dfsg/debian/changelog erlang-19.2.1+dfsg/debian/changelog
--- erlang-19.2.1+dfsg/debian/changelog	2019-02-09 01:28:34.000000000 +0300
+++ erlang-19.2.1+dfsg/debian/changelog	2020-05-26 11:30:58.000000000 +0300
@@ -1,3 +1,10 @@
+erlang (1:19.2.1+dfsg-2+deb9u3) stretch; urgency=medium
+
+  * Applied a patch which fixes CVE-2020-12872 vulnerability revealed
+    for the Yaws web server (TLS server offers weak ciphers for TLS 1.0).
+
+ -- Sergei Golovan <sgolovan@debian.org>  Tue, 26 May 2020 11:30:58 +0300
+
 erlang (1:19.2.1+dfsg-2+deb9u2) stretch; urgency=medium
 
   [ Andreas Beckmann ]
diff -Nru erlang-19.2.1+dfsg/debian/patches/cve-2020-12872.patch erlang-19.2.1+dfsg/debian/patches/cve-2020-12872.patch
--- erlang-19.2.1+dfsg/debian/patches/cve-2020-12872.patch	1970-01-01 03:00:00.000000000 +0300
+++ erlang-19.2.1+dfsg/debian/patches/cve-2020-12872.patch	2020-05-26 11:30:58.000000000 +0300
@@ -0,0 +1,25 @@
+From: Sergei Golovan <sgolovan@debian.org>
+Subject: Patch removes ciphers which are now considered weak
+ from the default TLS ciphers list. The vulnerability was found
+ in the Yaws web server and described as CVE-2020-12872.
+ It is fixed in the later Erlang releases.
+Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961422
+Forwarded: no
+
+--- a/lib/ssl/src/tls_v1.erl
++++ b/lib/ssl/src/tls_v1.erl
+@@ -204,14 +204,6 @@
+       ?TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
+       ?TLS_RSA_WITH_AES_256_CBC_SHA,
+ 
+-      ?TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
+-      ?TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
+-      ?TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
+-      ?TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,
+-      ?TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
+-      ?TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
+-      ?TLS_RSA_WITH_3DES_EDE_CBC_SHA,
+-
+       ?TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+       ?TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+       ?TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
diff -Nru erlang-19.2.1+dfsg/debian/patches/series erlang-19.2.1+dfsg/debian/patches/series
--- erlang-19.2.1+dfsg/debian/patches/series	2017-03-22 15:31:29.000000000 +0300
+++ erlang-19.2.1+dfsg/debian/patches/series	2020-05-26 11:30:58.000000000 +0300
@@ -12,3 +12,4 @@
 x32.patch
 cve-2016-10253.patch
 cve-2017-1000385.patch
+cve-2020-12872.patch

--- End Message ---
--- Begin Message --- 
Package: release.debian.org
Version: 9.13

Hi,

All of these requests relate to updates that were included in today's
stretch point release.

Regards,

Adam

--- End Message ---
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