In Eclipse Mosquitto 1.4.14, a user can shutdown the Mosquitto server simply by filling the RAM memory with a lot of connections with large payload. This can be done without authentications if occur in connection phase of MQTT protocol.

Fix CVE-2017-7651 (rhbz#1551755, rhbz#1551754)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It was discovered that mosquitto, an MQTT broker, was vulnerable to remote denial-of-service attacks that could be mounted using various vectors.

CVE-2017-7651 fix to avoid extraordinary memory consumption by crafted CONNECT packet from unauthenticated client

CVE-2017-7652 in case all sockets/file descriptors are exhausted, this is a fix to avoid default config values after reloading configuration by SIGHUP signal

For Debian 8 'Jessie', these problems have been fixed in version 1.3.4-2+deb8u2.

We recommend that you upgrade your mosquitto packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

CVE-2017-7651 A crafted CONNECT packet from an unauthenticated client could result in extraordinary memory consumption.

CVE-2017-7652 In case all sockets/file descriptors are exhausted, a SIGHUP signal to reload the configuration could result in default config values (especially bad security settings)

For Debian 7 'Wheezy', these problems have been fixed in version 0.15-2+deb7u3.

We recommend that you upgrade your mosquitto packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
120818	Fedora 28 : mosquitto (2018-d305559481)	Nessus	Fedora Local Security Checks	high
118408	Debian DSA-4325-1 : mosquitto - security update	Nessus	Debian Local Security Checks	high
110818	Debian DLA-1409-1 : mosquitto security update	Nessus	Debian Local Security Checks	high
108792	Fedora 26 : mosquitto (2018-e03a17fa61)	Nessus	Fedora Local Security Checks	high
108791	Fedora 27 : mosquitto (2018-ad652798b8)	Nessus	Fedora Local Security Checks	high
108768	Debian DLA-1334-1 : mosquitto security update	Nessus	Debian Local Security Checks	high

Detections

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CVE-2017-7651

high

Tenable Plugins

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high

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high