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Oracle Linux: (CVE-2019-3701) (Multiple Advisories): Unbreakable Enterprise kernel security update

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Oracle Linux: (CVE-2019-3701) (Multiple Advisories): Unbreakable Enterprise kernel security update

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
01/03/2019
Created
04/22/2019
Added
04/01/2019
Modified
07/21/2020

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.

Solution(s)

  • oracle-linux-upgrade-dtrace-modules
  • oracle-linux-upgrade-kernel-uek
  • oracle-linux-upgrade-kernel-uek-debug
  • oracle-linux-upgrade-kernel-uek-debug-devel
  • oracle-linux-upgrade-kernel-uek-devel
  • oracle-linux-upgrade-kernel-uek-doc
  • oracle-linux-upgrade-kernel-uek-firmware
  • oracle-linux-upgrade-kernel-uek-headers
  • oracle-linux-upgrade-kernel-uek-tools
  • oracle-linux-upgrade-kernel-uek-tools-libs
  • oracle-linux-upgrade-kernel-uek-tools-libs-devel
  • oracle-linux-upgrade-perf
  • oracle-linux-upgrade-python-perf

References

  • ELSA-2019-4612
  • USN-3932-1
  • USN-3932-2
  • USN-4115-1
  • USN-4115-2
  • USN-4118-1
  • CVE-2019-3701
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