GHSA-jxxm-27vp-c3m5
NATS allows MQTT clients to bypass ACL checks
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/nats-io/nats-server/v2 | < 2.11.15 | 2.11.15 |
| Go | github.com/nats-io/nats-server/v2 | >= 2.12.0-RC.1, < 2.12.6 | 2.12.6 |
| Go | github.com/nats-io/nats-server | all versions | no fix listed |
Details
As written in the advisory (Markdown source, shown as plain text).
### Background
NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.
The nats-server provides an MQTT client interface.
### Problem Description
When using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects.
### Affected Versions
Any version before v2.12.6 or v2.11.15
### Workarounds
None.
References
External links from the advisory. They lead to third-party sites.