NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port.
Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points.
If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 2
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Linuxfoundation Nats-Server
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
|
2.2.0
|
2.11.14
|
|
Linuxfoundation Nats-Server
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
|
2.12.0
|
2.12.5
|