OpenVPN Heartbeat Information Disclosure (Heartbleed)

High Nessus Plugin ID 73491

Synopsis

The remote service is affected by an information disclosure vulnerability.

Description

Based on its response to a TLS request with a specially crafted heartbeat message (RFC 6520), the remote OpenVPN service appears to be affected by an out-of-bounds read flaw.

Because the remote OpenVPN service does not employ the 'HMAC Firewall' feature, this vulnerability can be exploited without authentication.

This vulnerability could allow an attacker to obtain secret keys, cleartext VPN traffic, and other sensitive data.

Solution

Upgrade the version of OpenSSL that OpenVPN is linked against to 1.0.1g or later. Alternatively, recompile OpenSSL with the '-DOPENSSL_NO_HEARTBEATS' flag to disable the vulnerable functionality. For Windows servers, upgrade to OpenVPN version 2.3.2-I004 or later.

See Also

http://heartbleed.com/

http://eprint.iacr.org/2014/140

https://www.openssl.org/news/vulnerabilities.html#2014-0160

https://www.openssl.org/news/secadv/20140407.txt

https://community.openvpn.net/openvpn/wiki/heartbleed

Plugin Details

Severity: High

ID: 73491

File Name: openvpn_heartbleed.nasl

Version: 1.12

Type: remote

Family: Misc.

Published: 2014/04/14

Updated: 2018/07/16

Dependencies: 56022

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 9.4

Temporal Score: 7.8

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

Temporal Vector: CVSS2#E:F/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:openvpn:openvpn

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2014/04/07

Vulnerability Publication Date: 2014/02/24

Exploitable With

Core Impact

Metasploit (OpenSSL Heartbeat (Heartbleed) Information Leak)

Reference Information

CVE: CVE-2014-0160

BID: 66690

CERT: 720951

EDB-ID: 32745, 32764, 32791, 32998