Date: Thu, 13 Sep 2012 18:03:33 +0200 From: Marcus Meissner <meissner@...e.de> To: oss-security@...ts.openwall.com Cc: Vincent Danen <vdanen@...hat.com> Subject: Re: note on gnome shell extensions On Thu, Sep 13, 2012 at 05:39:57PM +0200, Tavis Ormandy wrote: > On Mon, Sep 10, 2012 at 02:48:38PM -0600, Vincent Danen wrote: > > * [2012-09-08 18:14:10 -0600] Kurt Seifried wrote: > > SUSE has some interesting info in their bug: > > > > https://bugzilla.novell.com/show_bug.cgi?id=779473#c4 > > > > By the sounds of it, this should be harmless. Vincent Untz says that > > the browser plugin doesn't actually install the extensions, it's passed > > to another process via a dbus call to gnome-shell, which sends the uuid > > of the extension to the extensions.gnome.org web site in order to > > download the extension. > > > > See: > > > > http://git.gnome.org/browse/gnome-shell/tree/js/ui/shellDBus.js#n305 > > http://git.gnome.org/browse/gnome-shell/tree/js/ui/extensionDownloader.js#n27 > > > > which is: > > > > let message = Soup.form_request_new_from_hash('GET', REPOSITORY_URL_INFO, params); > > > > And REPOSITORY_URL_INFO is hardcoded earlier: > > > > const REPOSITORY_URL_BASE = 'https://extensions.gnome.org'; > > const REPOSITORY_URL_DOWNLOAD = REPOSITORY_URL_BASE + '/download-extension/%s.shell-extension.zip'; > > const REPOSITORY_URL_INFO = REPOSITORY_URL_BASE + '/extension-info/'; > > const REPOSITORY_URL_UPDATE = REPOSITORY_URL_BASE + '/update-info/'; > > > > I don't think this is something that can be exploited, based on the > > above. > > Not sure I follow the logic, can't I just upload something malicious to > extensions.gnome.org and then force you to download it? I mean, I can > try it if you're not convinced it's possible. There are supposed to be reviewers before it gets activated, but exactly this concern Sebastian also voiced. > They surely do not have a magical technique for determining if my code > is or can become malicious. Exactly. Ciao, Marcus
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