FreeBSD : openvpn -- denial of service: client certificate validation can disconnect unrelated clients (a51ad838-2077-48b2-a136-e888a7db5f8d)

Medium Nessus Plugin ID 21488


The remote FreeBSD host is missing a security-related update.


James Yonan reports :

DoS attack against server when run with 'verb 0' and without 'tls-auth'. If a client connection to the server fails certificate verification, the OpenSSL error queue is not properly flushed, which can result in another unrelated client instance on the server seeing the error and responding to it, resulting in disconnection of the unrelated client.


Update the affected package.

See Also

Plugin Details

Severity: Medium

ID: 21488

File Name: freebsd_pkg_a51ad838207748b2a136e888a7db5f8d.nasl

Version: $Revision: 1.11 $

Type: local

Published: 2006/05/13

Modified: 2013/08/15

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 5

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

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

Patch Publication Date: 2005/08/19

Vulnerability Publication Date: 2005/08/03

Reference Information

CVE: CVE-2005-2531