FreeBSD : openvpn -- server-side denial-of-service vulnerability with tls-crypt-v2 (2cad4541-0f5b-11f0-89f8-411aefea0df9)

high Nessus Plugin ID 233819

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 a vulnerability as referenced in the 2cad4541-0f5b-11f0-89f8-411aefea0df9 advisory.

Gert Doering reports:
OpenVPN servers between 2.6.1 and 2.6.13 using
--tls-crypt-v2 can be made to abort with an ASSERT() message by sending a particular combination of authenticated and malformed packets.
To trigger the bug, a valid tls-crypt-v2 client key is needed, or network observation of a handshake with a valid tls-crypt-v2 client key No crypto integrity is violated, no data is leaked, and no remote code execution is possible.
This bug does not affect OpenVPN clients.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

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

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 233819

File Name: freebsd_pkg_2cad45410f5b11f089f8411aefea0df9.nasl

Version: 1.1

Type: local

Family: FreeBSD Local Security Checks

Published: 4/3/2025

Updated: 4/3/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2025-2704

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:openvpn-devel, 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: 4/2/2025

Vulnerability Publication Date: 4/2/2025

Reference Information

CVE: CVE-2025-2704

IAVA: 2025-A-0219

Detections

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