Vulnerability Assessment & Network Security Forums
If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Detailed Explanation for this Vulnerability Assessment
Several security related problems have been discovered in openvpn, a
Virtual Private Network daemon. The Common Vulnerabilities and
Exposures project identifies the following problems:
Wrong processing of failed certificate authentication when running
with "verb 0" and without TLS authentication can lead to a denial
of service by disconnecting the wrong client.
Wrong handling of packets that can't be decrypted on the server
can lead to the disconnection of unrelated clients.
When running in "dev tap" Ethernet bridging mode, openvpn can
exhaust its memory by receiving a large number of spoofed MAC
addresses and hence denying service.
Simultaneous TCP connections from multiple clients with the same
client certificate can cause a denial of service when
--duplicate-cn is not enabled.
The old stable distribution (woody) does not contain openvpn packages.
For the stable distribution (sarge) these problems have been fixed in
For the unstable distribution (sid) these problems have been fixed in
We recommend that you upgrade your openvpn package.
Solution : http://www.debian.org/security/2005/dsa-851
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is (C) 2007 Michel Arboi
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