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AUSCERT External Security Bulletin Redistribution
ESB-2021.3760
kexec-tools security, bug fix, and enhancement update
10 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: kexec-tools
Publisher: Red Hat
Operating System: Red Hat
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20269
Original Bulletin:
https://access.redhat.com/errata/RHSA-2021:4404
Comment: This advisory references vulnerabilities in products which run on
platforms other than Red Hat. It is recommended that administrators
running kexec-tools check for an updated version of the software for
their operating system.
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Red Hat Security Advisory
Synopsis: Low: kexec-tools security, bug fix, and enhancement update
Advisory ID: RHSA-2021:4404-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4404
Issue date: 2021-11-09
CVE Names: CVE-2021-20269
=====================================================================
1. Summary:
An update for kexec-tools is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact
of Low. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.
2. Relevant releases/architectures:
Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64
3. Description:
The kexec-tools packages contain the /sbin/kexec binary and utilities that
together form the user-space component of the kernel's kexec feature. The
/sbin/kexec binary facilitates a new kernel to boot using the kernel's
kexec feature either on a normal or a panic reboot. The kexec fastboot
mechanism allows booting a Linux kernel from the context of an already
running kernel.
Security Fix(es):
* kexec-tools: incorrect permissions on kdump dmesg file (CVE-2021-20269)
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.5 Release Notes linked from the References section.
4. Solution:
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
https://access.redhat.com/articles/11258
5. Bugs fixed (https://bugzilla.redhat.com/):
1892558 - kdump: provide a library API to export suggested crashkernel reservation values
1915819 - perror_exit call inside check_user_configured_target() function is not providing absolute path of dump location upon kdump service failure.
1918499 - kdump initrd generation fails if /boot not writable
1934261 - CVE-2021-20269 kexec-tools: incorrect permissions on kdump dmesg file
1965267 - [RHEL-8.5][ppc64le] makedumpfile failed to copy /proc/kcore that 'get_mm_sparsemem: Can't get the address of mem_section' or output nothing
6. Package List:
Red Hat Enterprise Linux BaseOS (v. 8):
Source:
kexec-tools-2.0.20-57.el8.src.rpm
aarch64:
kexec-tools-2.0.20-57.el8.aarch64.rpm
kexec-tools-debuginfo-2.0.20-57.el8.aarch64.rpm
kexec-tools-debugsource-2.0.20-57.el8.aarch64.rpm
ppc64le:
kexec-tools-2.0.20-57.el8.ppc64le.rpm
kexec-tools-debuginfo-2.0.20-57.el8.ppc64le.rpm
kexec-tools-debugsource-2.0.20-57.el8.ppc64le.rpm
s390x:
kexec-tools-2.0.20-57.el8.s390x.rpm
kexec-tools-debuginfo-2.0.20-57.el8.s390x.rpm
kexec-tools-debugsource-2.0.20-57.el8.s390x.rpm
x86_64:
kexec-tools-2.0.20-57.el8.x86_64.rpm
kexec-tools-debuginfo-2.0.20-57.el8.x86_64.rpm
kexec-tools-debugsource-2.0.20-57.el8.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2021-20269
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
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