CVE-2019-3701
First published: Thu Jan 03 2019(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=4.19.13 | |
| Debian Linux | =8.0 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.21-1 6.12.22-1 |
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html
- http://www.securityfocus.com/bid/106443
- 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://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://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
- https://usn.ubuntu.com/3932-1/
- https://usn.ubuntu.com/3932-2/
- https://usn.ubuntu.com/4115-1/
- https://usn.ubuntu.com/4118-1/
- https://marc.info/?l=linux-netdev&m=154651842302479&w=2
- https://marc.info/?l=linux-netdev&m=154661373531512&w=2
- https://launchpad.net/bugs/cve/CVE-2019-3701
- https://security-tracker.debian.org/tracker/CVE-2019-3701
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3701
- https://nvd.nist.gov/vuln/detail/CVE-2019-3701
- https://ubuntu.com/security/CVE-2019-3701
Frequently Asked Questions
What is the severity of CVE-2019-3701?
CVE-2019-3701 has a medium severity due to the potential for privileged users to exploit CAN frame modification rules.
How do I fix CVE-2019-3701?
To fix CVE-2019-3701, update your Linux kernel to versions 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, 6.12.11-1, or 6.12.12-1.
Which versions of Linux are affected by CVE-2019-3701?
CVE-2019-3701 affects Linux kernel versions up to and including 4.19.13 as well as Debian Linux 8.0 and Ubuntu Linux 14.04 and 16.04.
Who can exploit CVE-2019-3701?
A privileged user with root access and the CAP_NET_ADMIN capability can exploit CVE-2019-3701.
What components are involved in CVE-2019-3701?
CVE-2019-3701 involves the CAN frame modification rules found in the can_can_gw_rcv function in the Linux kernel.
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