Buffer overflow in Linux Kernel
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 14.04, 16.04
- Debian Linux — versions 8.0
Weakness classification (CWE)
References
- marc.info/ (Patch, Third Party Advisory)
- www.securityfocus.com/bid/106443 (VDB Entry, Third Party Advisory, vdb-entry)
- bugzilla.suse.com/show_bug.cgi (Exploit, Patch, Third Party Advisory, Issue Tracking)
- lists.debian.org/debian-lts-announce/2019/03/msg00034.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/04/msg00004.html (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/3932-1/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3932-2/ (vendor-advisory, Third Party Advisory)
- support.f5.com/csp/article/K17957133 (Third Party Advisory)
- marc.info/ (Patch, Mailing List, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/ (Patch, Mailing List, Vendor Advisory)
Frequently asked questions
- What is CVE-2019-3701?
- CVE-2019-3701 is a medium-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 4.4/10. Published 2019-01-03.
- How severe is CVE-2019-3701?
- Medium severity. CVSS v3 base score is 4.4 out of 10.