4.4 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
0.001 Low
EPSS
Percentile
30.3%
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.
Author | Note |
---|---|
tyhicks | The original CVE description that states that an unprivileged user can trigger a system crash is incorrect. Only the root user, from the init namespace, can trigger the system crash. Therefore, we’ll prioritize this issue as negligible. |
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | linux-aws | < 4.15.0-1047.49 | UNKNOWN |
ubuntu | 14.04 | noarch | linux-aws | < 4.4.0-1040.43 | UNKNOWN |
ubuntu | 16.04 | noarch | linux-aws | < 4.4.0-1079.89 | UNKNOWN |
ubuntu | 18.04 | noarch | linux-azure | < 5.0.0-1014.14~18.04.1 | UNKNOWN |
ubuntu | 16.04 | noarch | linux-azure | < 4.15.0-1056.61 | UNKNOWN |
ubuntu | 16.04 | noarch | linux-aws-hwe | < 4.15.0-1047.49~16.04.1 | UNKNOWN |
ubuntu | 18.04 | noarch | linux | < 4.15.0-60.67 | UNKNOWN |
ubuntu | 16.04 | noarch | linux | < 4.4.0-145.171 | UNKNOWN |
ubuntu | 18.04 | noarch | linux-azure-edge | < 5.0.0-1014.14~18.04.1 | UNKNOWN |
ubuntu | 16.04 | noarch | linux-azure-edge | < 4.15.0-1056.61 | UNKNOWN |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3701
launchpad.net/bugs/cve/CVE-2019-3701
marc.info/?l=linux-can&m=154659326224990&w=2
marc.info/?l=linux-netdev&m=154659326324991&w=2
nvd.nist.gov/vuln/detail/CVE-2019-3701
security-tracker.debian.org/tracker/CVE-2019-3701
ubuntu.com/security/notices/USN-3932-1
ubuntu.com/security/notices/USN-3932-2
ubuntu.com/security/notices/USN-4115-1
ubuntu.com/security/notices/USN-4118-1
4.4 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
0.001 Low
EPSS
Percentile
30.3%