Date: Fri, 15 Apr 2011 17:06:11 +0200 From: Yves-Alexis Perez <corsac@...ian.org> To: oss-security@...ts.openwall.com Subject: Re: CVE request for Thunar (format string errors) On ven., 2011-04-15 at 16:50 +0200, Tomas Hoger wrote: > On Fri, 15 Apr 2011 15:54:08 +0200 Yves-Alexis Perez wrote: > > > The first one is > > > http://git.xfce.org/xfce/thunar/commit/?id=1d4dfafda30df071d7c1e0b370f0613cbc92ba74 > > (bug at https://bugzilla.xfce.org/show_bug.cgi?id=7128) fixed in > > Thunar 1.2.1) and triggers when creating file from templates and > > calling it with a format string. > > Does this have real attack vector where trust boundary is crossed? > This sounds like a bug. Yeah, I don't think there's a way to ask Thunar to create a new file from a template programmatically, so the user really needs to go to the menu and create it. > > > The second is > > > http://git.xfce.org/xfce/thunar/commit/?id=03dd312e157d4fa8a11d5fa402706ae5b05806fa > > and is triggered when copy/pasting a file named from a format > string. > > There's no released version including the fix right now. > > This would probably qualify. Even if the user has to manually Ctrl-C/Ctrl-V the file in Thunar? Thanks. > > > As a side note, I do use -Wformat -Wformat-security > > -Werror=format-security (thanks to hardening-includes) for my Debian > > builds, but as those function are wrappers of wrappers of wrappers > to > > printf() and stuff like that, -Wformat-security won't help. Is there > a > > way to work around that? > > Fortify source should block code execution even in this case, I'd > expect. Yeah hopefully, but I was more thinking on a way to detect the format string error at compilation time. Manually it's kind of a pain as one has to check every usage of a function using va_args. Regards, -- Yves-Alexis
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