Description (CNA)
RT-Labs AB C-Open CANopen contains a write protection bypass in the SDO (Service Data Object) server implementation 'src/co_sdo_server.c' that fails to properly validate write permissions when processing download-segment frames. An unauthenticated attacker on the CAN bus can initiate an SDO upload for a read-only Object Dictionary (OD) entry, which sets a data pointer to the read-only object, then send download-segment frames to write to that memory location. The download-segment handler does not verify that a download session is active, allowing any CANopen node to overwrite read-only OD entries using two SDO frames. Note that CANopen protocol operates over CAN bus and does not provide built-in authentication mechanisms. Fixed in 1.1.1.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| RT-Labs AB / C-Open | affected 0 before 1.1.1; unaffected 1.1.1 |
CWE
CWE-863
References
- https://rt-labs.com/wp-content/uploads/2026/09/RRTL-260929-01.pdf
- https://github.com/rtlabs-com/c-open/releases/tag/public%2Fv1.1.1
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-275-02.json
- https://www.cve.org/CVERecord?id=CVE-2026-82358
ADP enrichment
No English description supplied.
No references supplied.