Date: Sat, 26 Oct 2019 06:37:29 -0700 From: Igor Seletskiy <i@...udlinux.com> To: oss-security@...ts.openwall.com Cc: mathias.payer@...elwelt.net, Hui Peng <benquike@...il.com> Subject: Re: Do distros want to see CVEs for Linux kernel USB bugs? I thought the DoS issue wasn't settled specifically due to USB over IP. Regards, Igor Seletskiy | CEO CloudLinux OS <https://cloudlinux.com/cloudlinuxos> | KernelCare <https://www.cloudlinux.com/kernelcare> | Imunify360 <http://imunify360.com/> Get 24/7 free, exceptionally good support at cloudlinux.zendesk.com Follow us on twitter for technical updates: @CloudLinuxOS <https://twitter.com/cloudlinuxos> On Fri, Oct 25, 2019 at 11:44 PM Marcus Meissner <meissner@...e.de> wrote: > On Fri, Oct 25, 2019 at 08:09:01PM +0200, Andrey Konovalov wrote: > > Hi! > > > > As we keep getting more USB bugs reported by syzbot , I'd like to > > figure out what to do with those in regards to CVEs. Last time I > > requested a bunch of CVEs for USB bugs, there was a long discussion > > about whether that is the right thing to do, see the full thread here > > . > > > > I don't want to argue now whether CVEs are useful for the upstream > > Linux kernel. My question is: with CVEs as they work today, do Linux > > distros want to see CVEs filed for Linux kernel bugs that are > > triggerable by a malicious USB device? > > > > Since not all USB bugs are the same, let's bucket them into: > > > > 1. Different kinds of DoS (e.g. null-ptr-deref). > > 2. Info / uninitialized memory leaks. > > 3. Bugs that lead to arbitrary code execution. > > 4. Non-triaged memory corruptions (UAF/OOB). > > > > Points 1-3 refer to the bugs that have been assessed for the impact > > that they cause, while point 4 refers to the bugs that haven't been > > looked at closely. > > > > Keep in mind that: > > > > 1. Most of the time physical access to the USB port is required to > > trigger these bugs. > > 2. Sometimes, in cases of e.g. exposed USB/IP or USBAnywhere like > > vulnerabilities  these bugs can be triggered remotely. > > > > Thanks! > > > >  https://syzkaller.appspot.com/upstream?manager=ci2-upstream-usb > > > >  https://www.openwall.com/lists/oss-security/2019/08/20/2 > > > >  https://github.com/eclypsium/USBAnywhere > > As discussed previously, "denial of service" (e.g. NULL ptr) via USB > device seems not to classify as CVE. (With the guidance that with physical > access you can cause more "denial of service" in other ways, like powering > down the machine.) > > So 2-3 could be CVE worthy from a distro perspective. > > For 4 I would assume reasonable guess work if its "just" a denial of > service or > more for CVE guidance. > > Ciao, Marcus >
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