openssl-announce-2016-01-28-changelogs.txt

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# Security announcement

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OpenSSL Security Advisory [28th Jan 2016]
=========================================

NOTE: SUPPORT FOR VERSION 1.0.1 WILL BE ENDING ON 31ST DECEMBER 2016. NO
SECURITY FIXES WILL BE PROVIDED AFTER THAT DATE. UNTIL THAT TIME SECURITY FIXES
ONLY ARE BEING APPLIED.

DH small subgroups (CVE-2016-0701)
==================================

Severity: High

Historically OpenSSL usually only ever generated DH parameters based on "safe"
primes. More recently (in version 1.0.2) support was provided for generating
X9.42 style parameter files such as those required for RFC 5114 support. The
primes used in such files may not be "safe". Where an application is using DH
configured with parameters based on primes that are not "safe" then an attacker
could use this fact to find a peer's private DH exponent. This attack requires
that the attacker complete multiple handshakes in which the peer uses the same
private DH exponent. For example this could be used to discover a TLS server's
private DH exponent if it's reusing the private DH exponent or it's using a
static DH ciphersuite.

OpenSSL provides the option SSL_OP_SINGLE_DH_USE for ephemeral DH (DHE) in TLS.
It is not on by default. If the option is not set then the server reuses the
same private DH exponent for the life of the server process and would be
vulnerable to this attack. It is believed that many popular applications do set
this option and would therefore not be at risk.

OpenSSL before 1.0.2f will reuse the key if:
- - SSL_CTX_set_tmp_dh()/SSL_set_tmp_dh() is used and SSL_OP_SINGLE_DH_USE is not
  set.
- - SSL_CTX_set_tmp_dh_callback()/SSL_set_tmp_dh_callback() is used, and both the
  parameters and the key are set and SSL_OP_SINGLE_DH_USE is not used. This is
  an undocumted feature and parameter files don't contain the key.
- - Static DH ciphersuites are used. The key is part of the certificate and
  so it will always reuse it. This is only supported in 1.0.2.

It will not reuse the key for DHE ciphers suites if:
- - SSL_OP_SINGLE_DH_USE is set
- - SSL_CTX_set_tmp_dh_callback()/SSL_set_tmp_dh_callback() is used and the
  callback does not provide the key, only the parameters. The callback is
  almost always used like this.

Non-safe primes are generated by OpenSSL when using:
- - genpkey with the dh_rfc5114 option. This will write an X9.42 style file
  including the prime-order subgroup size "q". This is supported since the 1.0.2
  version. Older versions can't read files generated in this way.
- - dhparam with the -dsaparam option. This has always been documented as
  requiring the single use.

The fix for this issue adds an additional check where a "q" parameter is
available (as is the case in X9.42 based parameters). This detects the
only known attack, and is the only possible defense for static DH ciphersuites.
This could have some performance impact.

Additionally the SSL_OP_SINGLE_DH_USE option has been switched on by default
and cannot be disabled. This could have some performance impact.

This issue affects OpenSSL version 1.0.2.

OpenSSL 1.0.2 users should upgrade to 1.0.2f

OpenSSL 1.0.1 is not affected by this CVE because it does not support X9.42
based parameters. It is possible to generate parameters using non "safe" primes,
but this option has always been documented as requiring single use and is not
the default or believed to be common. However, as a precaution, the
SSL_OP_SINGLE_DH_USE change has also been backported to 1.0.1r.

This issue was reported to OpenSSL on 12 January 2016 by Antonio Sanso (Adobe).
The fix was developed by Matt Caswell of the OpenSSL development team
(incorporating some work originally written by Stephen Henson of the OpenSSL
core team).

SSLv2 doesn't block disabled ciphers (CVE-2015-3197)
====================================================

Severity: Low

A malicious client can negotiate SSLv2 ciphers that have been disabled on the
server and complete SSLv2 handshakes even if all SSLv2 ciphers have been
disabled, provided that the SSLv2 protocol was not also disabled via
SSL_OP_NO_SSLv2.

This issue affects OpenSSL versions 1.0.2 and 1.0.1.

OpenSSL 1.0.2 users should upgrade to 1.0.2f
OpenSSL 1.0.1 users should upgrade to 1.0.1r

This issue was reported to OpenSSL on 26th December 2015 by Nimrod Aviram and
Sebastian Schinzel. The fix was developed by Nimrod Aviram with further
development by Viktor Dukhovni of the OpenSSL development team.


An update on DHE man-in-the-middle protection (Logjam)
====================================================================

A previously published vulnerability in the TLS protocol allows a
man-in-the-middle attacker to downgrade vulnerable TLS connections
using ephemeral Diffie-Hellman key exchange to 512-bit export-grade
cryptography. This vulnerability is known as Logjam
(CVE-2015-4000). OpenSSL added Logjam mitigation for TLS clients by
rejecting handshakes with DH parameters shorter than 768 bits in
releases 1.0.2b and 1.0.1n.

This limit has been increased to 1024 bits in this release, to offer
stronger cryptographic assurance for all TLS connections using
ephemeral Diffie-Hellman key exchange.

OpenSSL 1.0.2 users should upgrade to 1.0.2f
OpenSSL 1.0.1 users should upgrade to 1.0.1r

The fix was developed by Kurt Roeckx of the OpenSSL development team.

Note
====

As per our previous announcements and our Release Strategy
(https://www.openssl.org/policies/releasestrat.html), support for OpenSSL
version 1.0.1 will cease on 31st December 2016. No security updates for that
version will be provided after that date. Users of 1.0.1 are
advised to upgrade.

Support for versions 0.9.8 and 1.0.0 ended on 31st December 2015. Those versions
are no longer receiving security updates.

References
==========

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20160128.txt

Note: the online version of the advisory may be updated with additional
details over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html

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# Changelog 1.0.2f

 Changes between 1.0.2e and 1.0.2f [28 Jan 2016]

  *) DH small subgroups

     Historically OpenSSL only ever generated DH parameters based on "safe"
     primes. More recently (in version 1.0.2) support was provided for
     generating X9.42 style parameter files such as those required for RFC 5114
     support. The primes used in such files may not be "safe". Where an
     application is using DH configured with parameters based on primes that are
     not "safe" then an attacker could use this fact to find a peer's private
     DH exponent. This attack requires that the attacker complete multiple
     handshakes in which the peer uses the same private DH exponent. For example
     this could be used to discover a TLS server's private DH exponent if it's
     reusing the private DH exponent or it's using a static DH ciphersuite.

     OpenSSL provides the option SSL_OP_SINGLE_DH_USE for ephemeral DH (DHE) in
     TLS. It is not on by default. If the option is not set then the server
     reuses the same private DH exponent for the life of the server process and
     would be vulnerable to this attack. It is believed that many popular
     applications do set this option and would therefore not be at risk.

     The fix for this issue adds an additional check where a "q" parameter is
     available (as is the case in X9.42 based parameters). This detects the
     only known attack, and is the only possible defense for static DH
     ciphersuites. This could have some performance impact.

     Additionally the SSL_OP_SINGLE_DH_USE option has been switched on by
     default and cannot be disabled. This could have some performance impact.

     This issue was reported to OpenSSL by Antonio Sanso (Adobe).
     (CVE-2016-0701)
     [Matt Caswell]

  *) SSLv2 doesn't block disabled ciphers

     A malicious client can negotiate SSLv2 ciphers that have been disabled on
     the server and complete SSLv2 handshakes even if all SSLv2 ciphers have
     been disabled, provided that the SSLv2 protocol was not also disabled via
     SSL_OP_NO_SSLv2.

     This issue was reported to OpenSSL on 26th December 2015 by Nimrod Aviram
     and Sebastian Schinzel.
     (CVE-2015-3197)
     [Viktor Dukhovni]

  *) Reject DH handshakes with parameters shorter than 1024 bits.
     [Kurt Roeckx]

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 # # Changelog 1.0.1r
 
 Changes between 1.0.1q and 1.0.1r [28 Jan 2016]

  *) Protection for DH small subgroup attacks

     As a precautionary measure the SSL_OP_SINGLE_DH_USE option has been
     switched on by default and cannot be disabled. This could have some
     performance impact.
     [Matt Caswell]

  *) SSLv2 doesn't block disabled ciphers

     A malicious client can negotiate SSLv2 ciphers that have been disabled on
     the server and complete SSLv2 handshakes even if all SSLv2 ciphers have
     been disabled, provided that the SSLv2 protocol was not also disabled via
     SSL_OP_NO_SSLv2.

     This issue was reported to OpenSSL on 26th December 2015 by Nimrod Aviram
     and Sebastian Schinzel.
     (CVE-2015-3197)
     [Viktor Dukhovni]

  *) Reject DH handshakes with parameters shorter than 1024 bits.
     [Kurt Roeckx]
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