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CVE-2018-12551

Published: 27 March 2019

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use a password file for authentication, any malformed data in the password file will be treated as valid. This typically means that the malformed data becomes a username and no password. If this occurs, clients can circumvent authentication and get access to the broker by using the malformed username. In particular, a blank line will be treated as a valid empty username. Other security measures are unaffected. Users who have only used the mosquitto_passwd utility to create and modify their password files are unaffected by this vulnerability.

Notes

AuthorNote
ebarretto
mosquitto's version on Trusty is EOL.

Priority

Medium

Cvss 3 Severity Score

8.1

Score breakdown

Status

Package Release Status
mosquitto
Launchpad, Ubuntu, Debian
upstream
Released (1.5.6)
precise Does not exist

trusty Not vulnerable

xenial
Released (1.4.8-1ubuntu0.16.04.5)
bionic
Released (1.4.15-2ubuntu0.18.04.1)
cosmic
Released (1.4.15-2ubuntu0.18.10.1)
disco Not vulnerable
(1.5.6-1)
Patches:
upstream: https://mosquitto.org/files/cve/2018-12551/

Severity score breakdown

Parameter Value
Base score 8.1
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H