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Ubuntu 7.04 / 7.10 / 8.04 LTS : openvpn regression (USN-612-6)

high Nessus Plugin ID 32360

Synopsis

The remote Ubuntu host is missing one or more security-related patches.

Description

USN-612-3 addressed a weakness in OpenSSL certificate and keys generation in OpenVPN by adding checks for vulnerable certificates and keys to OpenVPN. A regression was introduced in OpenVPN when using TLS, multi-client/server mode, and specifying a user or group which caused OpenVPN to not start when using valid SSL certificates.

It was also found that openssl-vulnkey from openssl-blacklist would fail when stderr was not available. This caused OpenVPN to fail to start when used with applications such as NetworkManager.

This update fixes these problems. We apologize for the inconvenience.

A weakness has been discovered in the random number generator used by OpenSSL on Debian and Ubuntu systems. As a result of this weakness, certain encryption keys are much more common than they should be, such that an attacker could guess the key through a brute-force attack given minimal knowledge of the system. This particularly affects the use of encryption keys in OpenSSH, OpenVPN and SSL certificates.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected openssl-blacklist and / or openvpn packages.

See Also

https://usn.ubuntu.com/612-6/

Plugin Details

Severity: High

ID: 32360

File Name: ubuntu_USN-612-6.nasl

Version: 1.14

Type: local

Agent: unix

Published: 5/16/2008

Updated: 1/19/2021

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.2

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:openssl-blacklist, p-cpe:/a:canonical:ubuntu_linux:openvpn, cpe:/o:canonical:ubuntu_linux:7.04, cpe:/o:canonical:ubuntu_linux:7.10, cpe:/o:canonical:ubuntu_linux:8.04:-:lts

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/14/2008

Reference Information

BID: 29179

USN: 612-6