Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 4.19.13 |
| Debian | Debian Linux | 8.0 |
| Canonical | Ubuntu Linux | 14.04 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html
- http://www.securityfocus.com/bid/106443Third Party AdvisoryVDB Entry
- https://bugzilla.suse.com/show_bug.cgi?id=1120386ExploitIssue TrackingPatch
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=0aaa813Mailing ListPatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00034.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/04/msg00004.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/05/msg00002.htmlMailing ListThird Party Advisory
- https://marc.info/?l=linux-netdev&m=154651842302479&w=2PatchThird Party Advisory
- https://marc.info/?l=linux-netdev&m=154661373531512&w=2Mailing ListPatchThird Party Advisory
- https://support.f5.com/csp/article/K17957133Third Party Advisory
- https://usn.ubuntu.com/3932-1/Third Party Advisory
- https://usn.ubuntu.com/3932-2/Third Party Advisory
- https://usn.ubuntu.com/4115-1/
- https://usn.ubuntu.com/4118-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html
FAQ
What is CVE-2019-3701?
CVE-2019-3701 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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...
How severe is CVE-2019-3701?
CVE-2019-3701 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-3701?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux, Canonical Ubuntu Linux.