Date: Mon, 4 Jan 2021 14:27:59 +0100 From: Mauro Matteo Cascella <mcascell@...hat.com> To: Ferruh Yigit <ferruh.yigit@...el.com> Cc: oss-security@...ts.openwall.com, security@...k.org, security-prerelease@...k.org, "dev@...k.org" <dev@...k.org>, Ryan Hall <ryan.e.hall@...el.com> Subject: Re: [dpdk-dev] DPDK security advisory for multiple vhost crypto issues On Mon, Jan 4, 2021 at 12:29 PM Ferruh Yigit <ferruh.yigit@...el.com> wrote: > > On 1/4/2021 8:28 AM, Mauro Matteo Cascella wrote: > > Hello, > > > > Is there any particular reason for the Scope metric to be Unchanged > > (S:U) for CVE-2020-14377 and CVE-2020-14378? > > > > removed dpdk-announce mail list > > Hi Mauro, > > CVE-2020-14377, the memory over read is in the scope of the same application, > that is the reason of the unchanged scope. There is another CVE below that can > use this information to figure out where to overwrite for remote execution which > has scope set as 'Changed'. > > CVE-2020-14378, can cause loop taken longer time and delays the service, since > it is eating the core cycles, if there is something else using that specific > core technically it may delay it too, but DPDK mostly uses all core for itself > and since mainly the vhost crypto service is affected, scope selected as Unchanged. > > Is there a concern on the selected scope metric? > > Thanks. > Thank you for the timely reply. With regard to CVE-2020-14377, the Scope metric was rated differently by NIST  hence my initial question.  https://nvd.nist.gov/vuln/detail/CVE-2020-14377 > > On Mon, Sep 28, 2020 at 5:43 PM Ferruh Yigit <ferruh.yigit@...el.com> wrote: > >> > >> A set of vulnerabilities are fixed in DPDK: > >> - CVE-2020-14374 > >> - CVE-2020-14375 > >> - CVE-2020-14376 > >> - CVE-2020-14377 > >> - CVE-2020-14378 > >> > >> Some downstream stakeholders were warned in advance in order to coordinate the > >> release of fixes and reduce the vulnerability window. > >> > >> Problem: > >> A malicious guest can harm the host using vhost crypto, this includes > >> executing code in host (VM Escape), reading host application memory > >> space to guest and causing partially denial of service in the host. > >> >From the problem statement above I assume all these CVEs lead to some kind of guest-to-host compromise, which usually implies a Scope change (or at least, this holds true for QEMU flaws). Therefore I was wondering what's the reason behind the different evaluation of the Scope metric between CVE-2020-14377 and the others. Regards. -- Mauro Matteo Cascella Red Hat Product Security PGP-Key ID: BB3410B0
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