CVE-2018-12551 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://bugs.eclipse.org/bugs/show_bug.cgi?id=543401 https://lists.debian.org/debian-lts-announce/2019/10/msg00035.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1