Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when pattern-based ACL rules are configured, AuthorizationsCollector.canDoOperation substitutes client ID and username values directly into rules containing %c or %u and then treats the result as an MQTT topic filter. A client that uses + or # in either identity can broaden the substituted filter and gain cross-tenant read and write access.
A # identity can also produce an invalid filter that triggers a NullPointerException in Topic.match and disrupts session processing. This issue is fixed in version 0.18.1.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Moquette Moquette
cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:*
|
— |
0.18.1
|
References 3
https://github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c62…
security-advisories@github.com
https://github.com/moquette-io/moquette/releases/tag/v0.18.1
security-advisories@github.com
https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq
security-advisories@github.com