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Date: Mon, 10 Feb 2014 22:18:20 +0600
From: "Alexander E. Patrakov" <>
Subject: Re: CVE request: WebKit-GTK + Puseaudio: unexpectedly high sound

23.10.2013 00:48, I wrote:
> Hello.
> Some time ago I have reported an issue:
> , but decided not to request
> CVE at that time, because I wanted to collect opinions on the topic
> "who should fix what". I have collected them from both involved
> parties and thus now request a CVE ID for this coordination issue /
> case of contradicting requirements. Please let me know if I have
> omitted any of the required information.
> Let me reproduce the most important part of my initial report.
> ======
> The following combination of software has a nasty bug when used
> together, that I personally consider to be a vulnerability:
> * PulseAudio (any version, especially when used in flat-volume mode
> that is the default everywhere except Ubuntu).
>   * Any browser based on Webkit-GTK 2.x (any version with HTML5
> audio/video support based on GStreamer).
> The bug is that a malicious piece of javascript on the web page can
> cause an audio file to play at an unexpectedly high volume, not
> obeying the volume that the user has set for the web browser in
> pavucontrol or gnome-volume-control, and effectively not letting the
> user move the volume slider corresponding to the web browser [1]. When
> flat volumes are in effect, the web page can play that audio file at
> the full volume that the sound card is capable of, which can in some
> cases damage loudspeakers (especially tweeters) or the user's hearing
> [2].
> The reproducer (that just sets the volume at regular intervals using a
> timer) is already public at and can
> be trivially enhanced to also prevent muting of the audio stream. View
> that in Epiphany or Midori on any Linux distribution except Ubuntu.
> ======
> Personally, I classify [1] as an annoyance-class bug (but still a bug)
> and [2] as a security issue.
> Relevant links:

Given the recent news story about VLC and Dell, I want to bump this 
topic (because it is relevant, exploitable automatically, and because I 
have warned about hardware damage) and maybe get a CVE ID.

Alexander E. Patrakov

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