CVE-2019-3701

CVE Details

Release Date:	2019-01-03
Impact:	None	What is this?

Description

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.

See more information about CVE-2019-3701 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	4.4
Vector String:	CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	High
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 6 (dtrace-modules-3.8.13-118.32.1.el6uek)	ELSA-2019-4600	2019-04-08
Oracle Linux version 6 (kernel-uek)	ELSA-2019-4596	2019-03-31
Oracle Linux version 6 (kernel-uek)	ELSA-2019-4600	2019-04-08
Oracle Linux version 7 (dtrace-modules-3.8.13-118.32.1.el7uek)	ELSA-2019-4600	2019-04-08
Oracle Linux version 7 (kernel-uek)	ELSA-2019-4596	2019-03-31
Oracle Linux version 7 (kernel-uek)	ELSA-2019-4600	2019-04-08
Oracle Linux version 7 (kernel-uek)	ELSA-2019-4612	2019-04-12
Oracle VM version 3.4 (kernel-uek)	OVMSA-2019-0014	2019-05-02