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Re: [Qemu-devel] [PATCH 0/2] CVE-2015-1779: fix denial of service in VNC

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH 0/2] CVE-2015-1779: fix denial of service in VNC websockets
Date: Tue, 24 Mar 2015 16:51:00 +0100

On Mo, 2015-03-23 at 22:58 +0000, Daniel P. Berrange wrote:
> The VNC websockets protocol decoder has two places where it did
> not correctly limit its resource usage when processing data from
> the client. This can be abused by a malicious client to cause QEMU
> to consume all system memory, unless it is otherwise limited by
> ulimits and/or cgroups. These problems can be triggered in the
> websockets layer before the VNC protocol actually starts, so no
> client authentication will have taken place at this point.

Hmm, with patch 1/2 applied novnc disconnects frequently.  Boot messages
on the text (framebuffer) console seems to work fine.  But after logging
in via gdm and trying to do stuff in gnome shell problems are starting.


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