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FreeBSD : openvpn -- 2.6.0...2.6.6 --fragment option division by zero crash, and TLS data leak (2fe004f5-83fd-11ee-9f5d-31909fb2f495)

critical Nessus Plugin ID 185811

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Synopsis

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

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 2fe004f5-83fd-11ee-9f5d-31909fb2f495 advisory.

 - Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service. (CVE-2023-46849)

 - Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer. (CVE-2023-46850)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?e50d0043

http://www.nessus.org/u?7a71582c

Plugin Details

Severity: Critical

ID: 185811

File Name: freebsd_pkg_2fe004f583fd11ee9f5d31909fb2f495.nasl

Version: 1.1

Type: local

Published: 11/15/2023

Updated: 11/29/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2023-46850

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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:openvpn, cpe:/o:freebsd:freebsd

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/15/2023

Vulnerability Publication Date: 11/11/2023

Reference Information

CVE: CVE-2023-46849, CVE-2023-46850