Detections
Analytics

FreeBSD : FreeBSD -- jail escape possible by mounting over jail root (a7b97d26-9792-11eb-b87a-901b0ef719ab)

high Nessus Plugin ID 148537

Synopsis

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

Description

Due to a race condition between lookup of '..' and remounting a filesystem, a process running inside a jail might access filesystem hierarchy outside of jail. Impact : A process with superuser privileges running inside a jail configured with the allow.mount permission (not enabled by default) could change the root directory outside of the jail, and thus gain full read and write access to all files and directories in the system.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?f6ce1656

Plugin Details

Severity: High

ID: 148537

File Name: freebsd_pkg_a7b97d26979211ebb87a901b0ef719ab.nasl

Version: 1.3

Type: local

Published: 4/14/2021

Updated: 4/20/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2020-25584

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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: 4/7/2021

Vulnerability Publication Date: 4/6/2021

Reference Information

CVE: CVE-2020-25584

FreeBSD: SA-21:10.jail_mount