Date Discovered May 15, 2006
Description RealVNC is susceptible to an authentication-bypass vulnerability. This issue is due to a flaw in the authentication process of the affected package.
Exploiting this issue allows attackers to gain unauthenticated, remote access to the VNC servers.
RealVNC 4.1.1 is vulnerable to this issue; other versions may also be affected.
UPDATE (May 25, 2006): Reports indicate that this issue is being actively exploited in the wild.
Block external access at the network boundary, unless external parties require service. If applicable, block access to the computer at the network perimeter. Allow only trusted computers and networks access to resources.
Communicate sensitive information over encrypted channels.
Ensure that access to affected VNC servers occurs only through strongly authenticated means such as VPNs. This will enforce that an extra level of authentication is required to access affected servers.
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