Debian LTS: DLA-1972-1: mosquitto security update

    Date26 Oct 2019
    CategoryDebian LTS
    Posted ByLinuxSecurity Advisories
    Several issues have been found in mosquitto, a MQTT version 3.1/3.1.1 compatible message broker.
    Package        : mosquitto
    Version        : 1.3.4-2+deb8u4
    CVE ID         : CVE-2017-7655 CVE-2018-12550 CVE-2018-12551
    Several issues have been found in mosquitto, a MQTT version 3.1/3.1.1 
    compatible message broker.
          A Null dereference vulnerability in the Mosquitto library could
          lead to crashes for those applications using the library.
          An ACL file with no statements was treated as having a default
          allow policy. The new behaviour of an empty ACL file is a default
          policy of access denied.
          (this is in compliance with all newer releases)
          Malformed authentication data in the password file could allow
          clients to circumvent authentication and get access to the broker.
          Fix for processing a crafted SUBSCRIBE packet containing a topic
          that consists of approximately 65400 or more '/' characters.
          (setting TOPIC_HIERARCHY_LIMIT to 200)
    For Debian 8 "Jessie", these problems have been fixed in version
    We recommend that you upgrade your mosquitto packages.
    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at:
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