CVE-2020-7453
First published: Tue Apr 28 2020(Updated: )
In FreeBSD 12.1-STABLE before r359021, 12.1-RELEASE before 12.1-RELEASE-p3, 11.3-STABLE before r359020, and 11.3-RELEASE before 11.3-RELEASE-p7, a missing null termination check in the jail_set configuration option "osrelease" may return more bytes with a subsequent jail_get system call allowing a malicious jail superuser with permission to create nested jails to read kernel memory.
Credit: secteam@freebsd.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeBSD Kernel | =11.3 | |
| FreeBSD Kernel | =11.3-p1 | |
| FreeBSD Kernel | =11.3-p2 | |
| FreeBSD Kernel | =11.3-p3 | |
| FreeBSD Kernel | =11.3-p4 | |
| FreeBSD Kernel | =11.3-p5 | |
| FreeBSD Kernel | =11.3-p6 | |
| FreeBSD Kernel | =12.1 | |
| FreeBSD Kernel | =12.1-p1 | |
| FreeBSD Kernel | =12.1-p2 |
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Frequently Asked Questions
What is the severity of CVE-2020-7453?
CVE-2020-7453 has a severity rating of medium due to potential information leakage.
How do I fix CVE-2020-7453?
To fix CVE-2020-7453, upgrade your FreeBSD installation to the patched version 12.1-RELEASE-p3 or 11.3-RELEASE-p7.
Which versions are affected by CVE-2020-7453?
CVE-2020-7453 affects FreeBSD versions 11.3 and 12.1 prior to their respective patched releases.
What systems are impacted by CVE-2020-7453?
CVE-2020-7453 impacts systems running FreeBSD with the jail_set configuration option 'osrelease' in the specified versions.
What is the root cause of CVE-2020-7453?
The root cause of CVE-2020-7453 is a missing null termination check in the jail_set system call that can lead to excess bytes being returned.
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- agent/author
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- agent/references
- agent/softwarecombine
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- agent/software-canonical-lookup-request
- vendor/freebsd
- canonical/freebsd kernel
- version/freebsd kernel/11.3
- version/freebsd kernel/11.3-p1
- version/freebsd kernel/11.3-p2
- version/freebsd kernel/11.3-p3
- version/freebsd kernel/11.3-p4
- version/freebsd kernel/11.3-p5
- version/freebsd kernel/11.3-p6
- version/freebsd kernel/12.1
- version/freebsd kernel/12.1-p1
- version/freebsd kernel/12.1-p2