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Diffstat (limited to 'Changes.rst')
| -rw-r--r-- | Changes.rst | 123 |
1 files changed, 95 insertions, 28 deletions
diff --git a/Changes.rst b/Changes.rst index 454dde4..d5e12eb 100644 --- a/Changes.rst +++ b/Changes.rst @@ -44,6 +44,13 @@ ECDH key exchange The TLS control channel now supports for elliptic curve diffie-hellmann key exchange (ECDH). +Improved Certificate Revocation List (CRL) processing + CRLs are now handled by the crypto library (OpenSSL or mbed TLS), instead + of inside OpenVPN itself. The crypto library implementations are more + strict than the OpenVPN implementation was. This might reject peer + certificates that would previously be accepted. If this occurs, OpenVPN + will log the crypto library's error description. + Dualstack round-robin DNS client connect Instead of only using the first address of each ``--remote`` OpenVPN will now try all addresses (IPv6 and IPv4) of a ``--remote`` entry. @@ -154,28 +161,41 @@ Asynchronous push reply Deprecated features ------------------- -- ``--key-method 1`` is deprecated in 2.4 and will be removed in 2.5. Migrate - away from ``--key-method 1`` as soon as possible. The recommended approach - is to remove the ``--key-method`` option from the configuration files, OpenVPN - will then use ``--key-method 2`` by default. Note that this requires changing - the option in both the client and server side configs. +For an up-to-date list of all deprecated options, see this wiki page: +https://community.openvpn.net/openvpn/wiki/DeprecatedOptions + +- ``--key-method 1`` is deprecated in OpenVPN 2.4 and will be removed in v2.5. + Migrate away from ``--key-method 1`` as soon as possible. The recommended + approach is to remove the ``--key-method`` option from the configuration + files, OpenVPN will then use ``--key-method 2`` by default. Note that this + requires changing the option in both the client and server side configs. + +- ``--tls-remote`` is removed in OpenVPN 2.4, as indicated in the v2.3 + man-pages. Similar functionality is provided via ``--verify-x509-name``, + which does the same job in a better way. + +- ``--compat-names`` and ``--no-name-remapping`` were deprecated in OpenVPN 2.3 + and will be removed in v2.5. All scripts and plug-ins depending on the old + non-standard X.509 subject formatting must be updated to the standardized + formatting. See the man page for more information. + +- ``--no-iv`` is deprecated in OpenVPN 2.4 and will be removed in v2.5. + +- ``--keysize`` is deprecated in OpenVPN 2.4 and will be removed in v2.6 + together with the support of ciphers with cipher block size less than + 128-bits. -- CRLs are now handled by the crypto library (OpenSSL or mbed TLS), instead of - inside OpenVPN itself. The crypto library implementations are more strict - than the OpenVPN implementation was. This might reject peer certificates - that would previously be accepted. If this occurs, OpenVPN will log the - crypto library's error description. +- ``--comp-lzo`` is deprecated in OpenVPN 2.4. Use ``--compress`` instead. -- ``--tls-remote`` is removed in 2.4, as indicated in the 2.3 man-pages. Similar - functionality is provided via ``--verify-x509-name``, which does the same job in - a better way. +- ``--ifconfig-pool-linear`` has been deprecated since OpenVPN 2.1 and will be + removed in v2.5. Use ``--topology p2p`` instead. -- ``--compat-names`` and ``--no-name-remapping`` were deprecated in 2.3 and will - be removed in 2.5. All scripts and plug-ins depending on the old non-standard - X.509 subject formatting must be updated to the standardized formatting. See - the man page for more information. +- ``--client-cert-not-required`` is deprecated in OpenVPN 2.4 and will be removed + in v2.5. Use ``--verify-client-cert none`` for a functional equivalent. -- ``--no-iv`` is deprecated in 2.4 and will be removed in 2.5. +- ``--ns-cert-type`` is deprecated in OpenVPN 2.3.18 and v2.4. It will be removed + in v2.5. Use the far better ``--remote-cert-tls`` option which replaces this + feature. User-visible Changes @@ -298,13 +318,58 @@ Maintainer-visible changes files instead of older ones, to provide a unified behaviour across systemd based Linux distributions. -- With OpenVPN v2.4, the project has moved over to depend on and actively use +- With OpenVPN 2.4, the project has moved over to depend on and actively use the official C99 standard (-std=c99). This may fail on some older compiler/libc header combinations. In most of these situations it is recommended to use -std=gnu99 in CFLAGS. This is known to be needed when doing i386/i686 builds on RHEL5. +Version 2.4.4 +============= +This is primarily a maintenance release, with further improved OpenSSL 1.1 +integration, several minor bug fixes and other minor improvements. + +Bug fixes +--------- +- Fix issues when a pushed cipher via the Negotiable Crypto Parameters (NCP) is + rejected by the remote side + +- Ignore ``--keysize`` when NCP have resulted in a changed cipher. + +- Configurations using ``--auth-nocache`` and the management interface to provide + user credentials (like NetworkManager on Linux) on client side with servers + implementing authentication tokens (for example, using ``--auth-gen-token``) + will now behave correctly and not query the user for an, to them, unknown + authentication token on renegotiations of the tunnel. + +- Fix bug causing invalid or corrupt SOCKS port number when changing the + proxy via the management interface. + +- The man page should now have proper escaping of hyphens/minus characters + and have seen some minor corrections. + +User-visible Changes +-------------------- +- Linux servers with systemd which uses the ``openvpn-server@.service`` unit + file for server configurations will now utilize the automatic restart feature + in systemd. If the OpenVPN server process dies unexpectedly, systemd will + ensure the OpenVPN configuration will be restarted without any user interaction. + +Deprecated features +------------------- +- ``--no-replay`` is deprecated and will be removed in OpenVPN 2.5. +- ``--keysize`` is deprecated in OpenVPN 2.4 and will be removed in v2.6 + +Security +-------- +- CVE-2017-12166: Fix bounds check for configurations using ``--key-method 1``. + Before this fix, it could allow an attacker to send a malformed packet to + trigger a stack overflow. This is considered to be a low risk issue, as + ``--key-method 2`` has been the default since OpenVPN 2.0 (released on + 2005-04-17). This option is already deprecated in v2.4 and will be + completely removed in v2.5. + Version 2.4.3 ============= @@ -321,7 +386,7 @@ New features Security -------- - CVE-2017-7522: Fix ``--x509-track`` post-authentication remote DoS - A client could crash a 2.4+ mbedtls server, if that server uses the + A client could crash a v2.4+ mbedtls server, if that server uses the ``--x509-track`` option and the client has a correct, signed and unrevoked certificate that contains an embedded NUL in the certificate subject. Discovered and reported to the OpenVPN security team by Guido Vranken. @@ -378,7 +443,7 @@ User-visible Changes Bugfixes -------- - Fix fingerprint calculation in mbed TLS builds. This means that mbed TLS users - of OpenVPN 2.4.0, 2.4.1 and 2.4.2 that rely on the values of the + of OpenVPN 2.4.0, v2.4.1 and v2.4.2 that rely on the values of the ``tls_digest_*`` env vars, or that use ``--verify-hash`` will have to change the fingerprint values they check against. The security impact of the incorrect calculation is very minimal; the last few bytes (max 4, typically @@ -407,16 +472,18 @@ Version 2.4.2 Bugfixes -------- -- Fix memory leak introduced in 2.4.1: if --remote-cert-tls is used, we leaked - some memory on each TLS (re)negotiation. +- Fix memory leak introduced in OpenVPN 2.4.1: if ``--remote-cert-tls`` is + used, we leaked some memory on each TLS (re)negotiation. + Security -------- -- Fix a pre-authentication denial-of-service attack on both clients and servers. - By sending a too-large control packet, OpenVPN 2.4.0 or 2.4.1 can be forced - to hit an ASSERT() and stop the process. If ``--tls-auth`` or ``--tls-crypt`` - is used, only attackers that have the ``--tls-auth`` or ``--tls-crypt`` key - can mount an attack. (OSTIF/Quarkslab audit finding 5.1, CVE-2017-7478) +- Fix a pre-authentication denial-of-service attack on both clients and + servers. By sending a too-large control packet, OpenVPN 2.4.0 or v2.4.1 can + be forced to hit an ASSERT() and stop the process. If ``--tls-auth`` or + ``--tls-crypt`` is used, only attackers that have the ``--tls-auth`` or + ``--tls-crypt`` key can mount an attack. + (OSTIF/Quarkslab audit finding 5.1, CVE-2017-7478) - Fix an authenticated remote DoS vulnerability that could be triggered by causing a packet id roll over. An attack is rather inefficient; a peer |