OpenVPN Heartbeat Information Disclosure (Heartbleed)

medium Nessus Plugin ID 73491
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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: Medium

ID: 73491

File Name: openvpn_heartbleed.nasl

Version: 1.14

Type: remote

Family: Misc.

Published: 4/14/2014

Updated: 11/26/2019

Dependencies: openvpn_detect.nasl

Risk Information

CVSS Score Source: CVE-2014-0160

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.1

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

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

Vulnerability Information

CPE: cpe:/a:openvpn:openvpn

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/7/2014

Vulnerability Publication Date: 2/24/2014

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