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FreeBSD: VID-6B90ACBA-6A0A-11EA-92AB-00163E433440 (CVE-2020-7453): FreeBSD -- Kernel memory disclosure with nested jails

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FreeBSD: VID-6B90ACBA-6A0A-11EA-92AB-00163E433440 (CVE-2020-7453): FreeBSD -- Kernel memory disclosure with nested jails

Severity
3
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:N)
Published
03/19/2020
Created
03/24/2020
Added
03/20/2020
Modified
10/20/2020

Description

Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.

From VID-6B90ACBA-6A0A-11EA-92AB-00163E433440:

Problem Description:

A missing NUL-termination check for the jail_set(2) configration

option "osrelease" may return more bytes when reading the jail

configuration back with jail_get(2) than were originally set.

Impact:

For jails with a non-default setting of children.max > 0 ("nested

jails") a superuser inside a jail can create a jail and may be able to

read and take advantage of exposed kernel memory.

Solution(s)

  • freebsd-upgrade-base-11_3-release-p7
  • freebsd-upgrade-base-12_1-release-p3

References

  • CVE-2020-7453

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