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Amazon Linux AMI 2: CVE-2023-4207: Security patch for kernel, kernel-livepatch-4.14.320-243.544, kernel-livepatch-4.14.322-244.536, kernel-livepatch-4.14.322-244.539, kernel-livepatch-4.14.322-246.539, kernel-livepatch-5.10.186-179.751 (Multiple Advisories)

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Amazon Linux AMI 2: CVE-2023-4207: Security patch for kernel, kernel-livepatch-4.14.320-243.544, kernel-livepatch-4.14.322-244.536, kernel-livepatch-4.14.322-244.539, kernel-livepatch-4.14.322-246.539, kernel-livepatch-5.10.186-179.751 (Multiple Advisories)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
09/06/2023
Created
10/04/2023
Added
10/04/2023
Modified
11/02/2023

Description

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

Solution(s)

  • amazon-linux-ami-2-upgrade-bpftool
  • amazon-linux-ami-2-upgrade-bpftool-debuginfo
  • amazon-linux-ami-2-upgrade-kernel
  • amazon-linux-ami-2-upgrade-kernel-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-debuginfo-common-aarch64
  • amazon-linux-ami-2-upgrade-kernel-debuginfo-common-x86_64
  • amazon-linux-ami-2-upgrade-kernel-devel
  • amazon-linux-ami-2-upgrade-kernel-headers
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-320-243-544
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-320-243-544-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-536
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-536-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-539
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-244-539-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-246-539
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-322-246-539-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-326-245-539
  • amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-186-179-751
  • amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-186-179-751-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-192-182-736
  • amazon-linux-ami-2-upgrade-kernel-livepatch-5-15-128-80-144
  • amazon-linux-ami-2-upgrade-kernel-tools
  • amazon-linux-ami-2-upgrade-kernel-tools-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-tools-devel
  • amazon-linux-ami-2-upgrade-perf
  • amazon-linux-ami-2-upgrade-perf-debuginfo
  • amazon-linux-ami-2-upgrade-python-perf
  • amazon-linux-ami-2-upgrade-python-perf-debuginfo

References

  • https://attackerkb.com/topics/cve-2023-4207
  • AL2/ALAS-2023-2264
  • AL2/ALASKERNEL-5.10-2023-039
  • AL2/ALASKERNEL-5.15-2023-026
  • AL2/ALASKERNEL-5.4-2023-054
  • AL2/ALASLIVEPATCH-2023-151
  • AL2/ALASLIVEPATCH-2023-152
  • AL2/ALASLIVEPATCH-2023-153
  • AL2/ALASLIVEPATCH-2023-154
  • AL2/ALASLIVEPATCH-2023-155
  • CVE - 2023-4207
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