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.

• CVE ID
• CVE-2019-3701

• Assigner
• cve@mitre.org

• Vulnerability Status
• Modified

• Published Version
• 2019-01-03T16:29:00

• Last Modified Date
• 2019-09-03T00:15:18

• Version
• 2.0

• Vector String
• AV:L/AC:L/Au:N/C:N/I:N/A:C

• Access Vector
• LOCAL

• Access Compatibility
• LOW

• Authentication
• NONE

• Confidentiality Impact
• NONE

• Integrity Impact
• NONE

• Availability Impact
• COMPLETE

• Base Score
• 4.9

• Severity
• MEDIUM

• Exploitability Score
• 3.9

• Impact Score
• 6.9

• Version
• 3.0

• Vector String
• CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

• Attack Vector
• LOCAL

• Attack Compatibility
• LOW

• Privileges Required
• HIGH

• User Interaction
• NONE

• Scope
• UNCHANGED

• Confidentiality Impact
• NONE

• Availability Impact
• HIGH

• Base Score
• 4.4

• Base Severity
• MEDIUM

• Exploitability Score
• 0.8

• Impact Score
• 3.6