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Vigil@nce: RealVNC, denial of service via ClientCutText

May 2010 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

An authenticated attacker can send the ClientCutText message to
RealVNC, in order to stop it.

 Severity: 1/4
 Creation date: 05/05/2010

DESCRIPTION OF THE VULNERABILITY

The RealVNC server implements several messages for interface
manipulation:
 ClientCutText : cut a text area
 PointerEvent : a mouse event
 etc.

However, the winvnc4.exe process does not check if the size
indicated in the ClientCutText message is too long.

An authenticated attacker can therefore send the ClientCutText
message to RealVNC, in order to stop it.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/RealVNC-denial-of-service-via-ClientCutText-9629


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