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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
Tries to bypass authentication using RealVNC
Detailed Explanation for this Vulnerability Assessment
The remote VNC server is prone to an authentication bypass issue.
The remote host appears to be running RealVNC, a VNC server for
Windows and Linux/unix platforms.
The version of RealVNC installed on the remote host permits a possible hacker
to bypass authentication by simply requesting 'Type 1 - None' as the
authentication type even though it is not explicitly configured to
support that. By exploiting this issue, a possible hacker gains access to
the affected host at the privilege level under which RealVNC operates,
typically as Administrator under Windows.
See also :
Upgrade to RealVNC Free Edition 4.1.2 / Personal Edition 4.2.3 /
Enterprise Edition 4.2.3 or later.
Network Security Threat Level:
High / CVSS Base Score : 7.0
Networks Security ID: 17978
Vulnerability Assessment Copyright: This script is Copyright (C) 2006 Tenable Network Security
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