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CVE
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CVE-2019-3701Date: (C)2019-01-04   (M)2024-03-26


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 Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 4.4CVSS Score : 4.9
Exploit Score: 0.8Exploit Score: 3.9
Impact Score: 3.6Impact Score: 6.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: LOCALAccess Vector: LOCAL
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: HIGHAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: COMPLETE
Integrity: NONE 
Availability: HIGH 
  
Reference:
BID-106443
USN-3932-1
USN-3932-2
USN-4115-1
USN-4118-1
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
https://bugzilla.suse.com/show_bug.cgi?id=1120386
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=0aaa81377c5a01f686bcdb8c7a6929a7bf330c68
https://marc.info/?l=linux-netdev&m=154651842302479&w=2
https://marc.info/?l=linux-netdev&m=154661373531512&w=2
https://support.f5.com/csp/article/K17957133
openSUSE-SU-2020:0543

CPE    4
cpe:/o:debian:debian_linux:8.0
cpe:/o:linux:linux_kernel
cpe:/o:canonical:ubuntu_linux:16.04::~~lts~~~
cpe:/o:canonical:ubuntu_linux:14.04::~~lts~~~
...
CWE    1
CWE-787
OVAL    24
oval:org.secpod.oval:def:705157
oval:org.secpod.oval:def:705155
oval:org.secpod.oval:def:58867
oval:org.secpod.oval:def:89000063
...

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