In Mosquitto before 1.4.12, pattern based ACLs can be bypassed by clients that set their username/client id to # or +. This allows locally or remotely connected clients to access MQTT topics that they do have the rights to. The same issue may be present in third party authentication/access control plugins for Mosquitto.
Weakness
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mosquitto | Eclipse | * | 1.4.12 (excluding) |
| Mosquitto | Ubuntu | devel | * |
| Mosquitto | Ubuntu | esm-apps/xenial | * |
| Mosquitto | Ubuntu | esm-infra-legacy/trusty | * |
| Mosquitto | Ubuntu | trusty | * |
| Mosquitto | Ubuntu | trusty/esm | * |
| Mosquitto | Ubuntu | upstream | * |
| Mosquitto | Ubuntu | xenial | * |
| Mosquitto | Ubuntu | yakkety | * |
| Mosquitto | Ubuntu | zesty | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/114.html
- https://cwe.mitre.org/data/definitions/115.html
- https://cwe.mitre.org/data/definitions/151.html
- https://cwe.mitre.org/data/definitions/194.html
- https://cwe.mitre.org/data/definitions/22.html
- https://cwe.mitre.org/data/definitions/57.html
- https://cwe.mitre.org/data/definitions/593.html
- https://cwe.mitre.org/data/definitions/633.html
- https://cwe.mitre.org/data/definitions/650.html
- https://cwe.mitre.org/data/definitions/94.html
References
- http://mosquitto.org/2017/05/security-advisory-cve-2017-7650/
- http://www.debian.org/security/2017/dsa-3865
- http://www.securityfocus.com/bid/98741
- https://bugs.eclipse.org/bugs/show_bug.cgi?id=516765
- http://mosquitto.org/2017/05/security-advisory-cve-2017-7650/
- http://www.debian.org/security/2017/dsa-3865
- http://www.securityfocus.com/bid/98741
- https://bugs.eclipse.org/bugs/show_bug.cgi?id=516765