CVE-2019-3701
An issue was discovered in can_can_gw_rcv in net/can/gw.c in the Linux kernel through 4.19.13. The CAN frame modification rules allow bitwise logical operations that can be also applied to the can_dlc field. The privileged user "root" with CAP_NET_ADMIN can create a CAN frame modification rule that makes the data length code a higher value than the available CAN frame data size. In combination with a configured checksum calculation where the result is stored relatively to the end of the data (e.g. cgw_csum_xor_rel) the tail of the skb (e.g. frag_list pointer in skb_shared_info) can be rewritten which finally can cause a system crash. Because of a missing check, the CAN drivers may write arbitrary content beyond the data registers in the CAN controller's I/O memory when processing can-gw manipulated outgoing frames.
- CVSS v3.0
- 4.4 MEDIUM
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H - CVSS v2.0
- 4.9 MEDIUM
AV:L/AC:L/Au:N/C:N/I:N/A:C - EPSS
- 0.70% chance of exploitation in the next 30 days, 51th percentile
- Published
- 2019-01-03
- Updated
- 2024-08-04