Date: Tue, 19 Feb 2013 12:40:50 -0800 From: Julien Tinnes <julien@....org> To: oss-security@...ts.openwall.com Subject: Re: Linux kernel race condition with PTRACE_SETREGS (CVE-2013-0871) On Sat, Feb 16, 2013 at 2:49 AM, Solar Designer <solar@...nwall.com> wrote: > I haven't looked into this closely yet, but at first glance it looks > like the worst Linux kernel vulnerability in a few years. The good news is that the race is not trivial to win in an exploit. It also requires access to ptrace() (but unfortunately most distros don't limit ptrace()). > For distro > vendor kernels (rather than mainline, which was patched almost a month > ago), this is a 0-day. We need to figure out a few things: > > What's the oldest affected kernel version? I didn't spend much time looking at that, but I think it may pre-date 2.6. > Which "stable" and distro vendor kernels are affected? This does not > appear to be e.g. on Red Hat's Bugzilla yet ... but it's already on HN: I don't know, but probably all / most ? > Are all architectures affected? The ptrace code in the kernel is > naturally somewhat arch-specific, so _maybe_ not all are affected. We don't know of any other architecture other that x86 affected, but again, I don't think anyone spent time trying to figure this out. It's possible that the same mistake was made on another architecture. > The mainline commits from January are by Oleg Nesterov of Red Hat. Why > wasn't(?) the issue handled with due severity within Red Hat, then - > such that Red Hat would at the very least have a statement on whether > and which of their kernels are affected by now. My guess is that the > full severity of the issue might not have been understood by Oleg at the > time, but it's only a guess. That's the eternal debate :) Since upstream doesn't want to handle security and disclosure, I sure wish that distro vendors could regroup, step-up and do it. As for why it took so long for me to send this e-mail after the patch went public: there is no good answer, mostly we were busy with other things. Sorry about that. Julien
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