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FreeBSD : FreeBSD -- Kernel memory disclosure with nested jails (6b90acba-6a0a-11ea-92ab-00163e433440)

medium Nessus Plugin ID 134722

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

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

Update the affected packages.

See Also

http://www.nessus.org/u?7467343d

Plugin Details

Severity: Medium

ID: 134722

File Name: freebsd_pkg_6b90acba6a0a11ea92ab00163e433440.nasl

Version: 1.6

Type: local

Published: 3/20/2020

Updated: 8/21/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.4

Vector: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2020-7453

CVSS v3

Risk Factor: Medium

Base Score: 6

Temporal Score: 5.2

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:freebsd, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 3/19/2020

Vulnerability Publication Date: 3/19/2020

Reference Information

CVE: CVE-2020-7453

FreeBSD: SA-20:08.jail

IAVA: 2020-A-0188-S