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   SpeakFreely for Win <= 7.6a remote crash through malformed GIF

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A] You must create a custom GIF file manually (with a hex editor) or
   you can also use my small tool ("gifbug file.gif" or "gifbug -iw 0
   -ih 0 file.gif"):

   http://aluigi.org/testz/gifbug.zip

B] Then you must select the malformed GIF from your SpeakFreely client
   (Options -> Show your face)

C] You must connect to the victim (Connection -> New)

D] And then you need to talk or just to press the left mouse button on
   the dialog box appeared

E] The victim should be crashed



(NOTE: you can also wait an incoming connection and passively crash the
client)