NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In NanoMQ version 0.24.6, after enabling auth.http_auth (HTTP authentication), when a client connects to the broker using MQTT CONNECT without providing username/password, and the configuration params uses the placeholders %u / %P (e.g., username="%u", password="%P"), the HTTP request construction phase enters auth_http.c:set_data(). This results in calling strlen() on a NULL pointer, causing a SIGSEGV crash.
This crash can be triggered remotely, resulting in a denial of service. This issue has been patched in version 0.24.7.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a…
security-advisories@github.com
https://github.com/nanomq/NanoNNG/pull/1394
security-advisories@github.com
https://github.com/nanomq/nanomq/releases/tag/0.24.7
security-advisories@github.com
https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3p
security-advisories@github.com