NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.8, NanoMQ’s MQTT-over-WebSocket transport can be crashed by sending an MQTT packet with a deliberately large Remaining Length in the fixed header while providing a much shorter actual payload. The code path copies Remaining Length bytes without verifying that the current receive buffer contains that many bytes, resulting in an out-of-bounds read (ASAN reports OOB / crash).
This is remotely triggerable over the WebSocket listener. This issue has been patched in version 0.24.8.
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
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf0…
security-advisories@github.com
https://github.com/nanomq/NanoNNG/pull/1405
security-advisories@github.com
https://github.com/nanomq/nanomq/releases/tag/0.24.8
security-advisories@github.com
https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29x
security-advisories@github.com