CVE-2021-20269
Published: 10 March 2022
A flaw was found in the permissions of a log file created by kexec-tools. This flaw allows a local unprivileged user to read this file and leak kernel internal information from a previous panic. The highest threat from this vulnerability is to confidentiality. This flaw affects kexec-tools shipped by Fedora versions prior to 2.0.21-8 and RHEL versions prior to 2.0.20-47.
Notes
Author | Note |
---|---|
sbeattie | on ubuntu/debian, makedumpfile from src:makedumpfile is used to create the dmesg file, and correctly limits the permissions on it. On Fedora/RedHat, the kdump-lib-initramfs.sh is used and is where the vulnerability lies. This script is not included in ubuntu/debian packaging. |
Priority
Status
Package | Release | Status |
---|---|---|
kexec-tools Launchpad, Ubuntu, Debian |
impish |
Not vulnerable
(code not present)
|
bionic |
Not vulnerable
(code not present)
|
|
focal |
Not vulnerable
(code not present)
|
|
groovy |
Not vulnerable
(code not present)
|
|
hirsute |
Not vulnerable
(code not present)
|
|
xenial |
Not vulnerable
(code not present)
|
|
upstream |
Needs triage
|
|
trusty |
Does not exist
|
|
jammy |
Not vulnerable
(code not present)
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 5.5 |
Attack vector | Local |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | None |
Availability impact | None |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |