Date: Wed, 13 Feb 2019 02:41:48 -0800 From: EJ Campbell <ejc3@...izonmedia.com> To: Aleksa Sarai <cyphar@...har.com> Cc: oss-security@...ts.openwall.com Subject: Re: CVE-2019-5736: runc container breakout exploit code That should have been +i, sorry. Thank you for your quick response. EJ On Wed, Feb 13, 2019 at 1:58 AM Aleksa Sarai <cyphar@...har.com> wrote: > On 2019-02-13, Aleksa Sarai <cyphar@...har.com> wrote: > > On 2019-02-13, EJ Campbell <ejc3@...izonmedia.com> wrote: > > > While fixing docker / runc is clearly the right fix, would using > chattr -i > > > on runc be a quick mitigation for the issue? I believe that will > prevent > > > the file from being overwritten by the exploit and Etienne Stalmans > > > verified that it helped: > > > https://twitter.com/_staaldraad/status/1095354945073754112 > > > > The privileged user in the container could just un-set the immutable > > bit using "/proc/self/fd/..." and then open it for writing. A read-only > > filesystem would work much better. > > Sorry, I forgot that CAP_LINUX_IMMUTABLE is dropped by default in > Docker. Yes that mitigation would also work. > > -- > Aleksa Sarai > Senior Software Engineer (Containers) > SUSE Linux GmbH > <https://www.cyphar.com/> >
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