Description
nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus client-side recv_read_device_identification_res function (FC 0x2B/MEI 0x0E, Read Device Identification) in nanomodbus.c. The server-supplied object_length field (0-246) is validated only against the remaining PDU size (res_size_left) and is never validated against the caller-supplied buffers_length parameter.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| debevv | nanoMODBUS | ≤ 1.23.0 | — |
References
- https://github.com/debevv/nanoMODBUS third-party-advisory
- https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c third-party-advisory