Roger A. Light
4 years ago
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<!--
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.. title: Version 2.0.12 released.
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.. slug: version-2-0-12-released
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.. date: 2021-08-31 17:16:38 UTC+1
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.. tags: Releases
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.. category:
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.. link:
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.. description:
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.. type: text
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-->
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Versions 2.0.12 of Mosquitto has been released. This is a security
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and bugfix release.
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# Security
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- An MQTT v5 client connecting with a large number of user-property properties
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could cause excessive CPU usage, leading to a loss of performance and
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possible denial of service. This has been fixed.
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- Fix `max_keepalive` not applying to MQTT v3.1.1 and v3.1 connections.
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These clients are now rejected if their keepalive value exceeds
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max_keepalive. This option allows [CVE-2020-13849], which is for the MQTT
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v3.1.1 protocol itself rather than an implementation, to be addressed.
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- Using certain listener related configuration options e.g. `cafile`, that
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apply to the default listener without defining any listener would cause a
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remotely accessible listener to be opened that was not confined to the local
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machine but did have anonymous access enabled, contrary to the
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documentation. This has been fixed. Closes [#2283].
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- [CVE-2021-34434]: If a plugin had granted ACL subscription access to a
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durable/non-clean-session client, then removed that access, the client would
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keep its existing subscription. This has been fixed.
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- Incoming QoS 2 messages that had not completed the QoS flow were not being
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checked for ACL access when a clean session=False client was reconnecting.
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This has been fixed.
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# Broker
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- Fix possible out of bounds memory reads when reading a corrupt/crafted
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configuration file. Unless your configuration file is writable by untrusted
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users this is not a risk. Closes [#567213].
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- Fix `max_connections` option not being correctly counted.
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- Fix TLS certificates and TLS-PSK not being able to be configured at the same
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time.
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- Disable TLS v1.3 when using TLS-PSK, because it isn't correctly configured.
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- Fix `max_keepalive` not applying to MQTT v3.1.1 and v3.1 connections.
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These clients are now rejected if their keepalive value exceeds
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`max_keepalive`. This option allows CVE-2020-13849, which is for the MQTT
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v3.1.1 protocol itself rather than an implementation, to be addressed.
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- Fix broker not quiting if e.g. the `password_file` is specified as a
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directory. Closes [#2241].
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- Fix listener `mount_point` not being removed on outgoing messages.
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Closes [#2244].
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- Strict protocol compliance fixes, plus test suite.
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- Fix $share subscriptions not being recovered for durable clients that
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reconnect.
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- Update plugin configuration documentation. Closes [#2286].
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# Client library
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- If a client uses TLS-PSK then force the default cipher list to use "PSK"
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ciphers only. This means that a client connecting to a broker configured
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with x509 certificates only will now fail. Prior to this, the client would
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connect successfully without verifying certificates, because they were not
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configured.
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- Disable TLS v1.3 when using TLS-PSK, because it isn't correctly configured.
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- Threaded mode is deconfigured when the `mosquitto_loop_start()` thread ends,
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which allows `mosquitto_loop_start()` to be called again. Closes [#2242].
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- Fix `MOSQ_OPT_SSL_CTX` not being able to be set to NULL. Closes [#2289].
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- Fix reconnecting failing when `MOSQ_OPT_TLS_USE_OS_CERTS` was in use, but none
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of `capath`, `cafile`, `psk`, nor `MOSQ_OPT_SSL_CTX` were set, and
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`MOSQ_OPT_SSL_CTX_WITH_DEFAULTS` was set to the default value of true.
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Closes [#2288].
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# Apps
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- Fix `mosquitto_ctrl dynsec setDefaultACLAccess` command not working.
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# Clients
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- `mosquitto_sub` and `mosquitto_rr` now open stdout in binary mode on Windows
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so binary payloads are not modified when printing.
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- Document TLS certificate behaviour when using `-p 8883`.
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# Build
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- Fix installation using `WITH_TLS=no`. Closes [#2281].
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- Fix builds with libressl 3.4.0. Closes [#2198].
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- Remove some unnecessary code guards related to libressl.
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- Fix printf format build warning on MIPS. Closes [#2271].
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[#2198]: https://github.com/eclipse/mosquitto/issues/2198
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[#2241]: https://github.com/eclipse/mosquitto/issues/2241
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[#2242]: https://github.com/eclipse/mosquitto/issues/2242
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[#2244]: https://github.com/eclipse/mosquitto/issues/2244
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[#2271]: https://github.com/eclipse/mosquitto/issues/2271
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[#2281]: https://github.com/eclipse/mosquitto/issues/2281
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[#2286]: https://github.com/eclipse/mosquitto/issues/2286
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[#2288]: https://github.com/eclipse/mosquitto/issues/2288
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[#2289]: https://github.com/eclipse/mosquitto/issues/2289
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[#567213]: https://bugs.eclipse.org/bugs/show_bug.cgi?id=567213
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[CVE-2020-13849]: https://nvd.nist.gov/vuln/detail/CVE-2020-13849
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[CVE-2021-34434]: https://nvd.nist.gov/vuln/detail/CVE-2021-34434
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