FreeBSD : FreeBSD -- jail_attach(2) relies on the caller to change the cwd (bba850fd-770e-11eb-b87a-901b0ef719ab)

high Nessus Plugin ID 146845

Synopsis

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

Description

When a process, such as jexec(8) or killall(1), calls jail_attach(2) to enter a jail, the jailed root can attach to it using ptrace(2) before the current working directory is changed. Impact : A process with superuser privileges running inside a jail could change the root directory outside of the jail, thereby gaining full read and writing access to all files and directories in the system.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 146845

File Name: freebsd_pkg_bba850fd770e11ebb87a901b0ef719ab.nasl

Version: 1.3

Type: local

Family: FreeBSD Local Security Checks

Published: 2/25/2021

Updated: 4/6/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2020-25582

CVSS v3

Risk Factor: High

Base Score: 8.7

Temporal Score: 7.6

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

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

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd: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: 2/25/2021

Vulnerability Publication Date: 2/24/2021

Reference Information

CVE: CVE-2020-25582

FreeBSD: SA-21:05.jail_chdir

Detections

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