Date: Tue, 17 Nov 2020 11:30:45 -0500 From: Ana McTaggart <amctagga@...hat.com> To: Ilya Dryomov <idryomov@...hat.com>, oss-security@...ts.openwall.com Subject: Re: CVE-2020-25677 ceph: CEPHX_V2 replay attack protection lost Correction. The correct CVE is CVE-2020-25660 Ana McTaggart Red Hat Product Security Red Hat Remote <https://www.redhat.com> secalert@...hat.com for urgent response amct@...hat.com M: 7742790791 IM: amctagga Pronouns:They/Them/Theirs On Tue, Nov 17, 2020 at 9:10 AM Ana McTaggart <amctagga@...hat.com> wrote: > Dear all, > cephx authentication protocol does not verify ceph clients correctly, and > is vulnerable to replay attacks in nautilus and later. An attacker with > access to the Ceph cluster network can use this vulnerability to > authenticate with ceph service, via a packet sniffer. This allows them to > perform actions allowed by the ceph service. This is a reintroduction of > CVE-2018-1128, affecting msgr2 protocol. msgr 2 protocol is used for all > communication except for older clients that do not support msgr2 protocol. > msgr1 protocol is not affected. > > This was introduced in commit to msgr2 321548010578 ("mon/MonClient: skip > CEPHX_V2 challenge if client doesn't support it") , due to commit > c58c5754dfd2 ("msg/async/ProtocolV1: use AuthServer and AuthClient") . This > results in nautilus and ceph being affected because commit c58c5754dfd2 > wasn't backported to nautilus, and although msgr1 isn't affected in > nautilus, msgr 2 is the default. This made it so authorizer challenges > could be skipped for peers which did not support CEPHX_V2, unfortunately > making it so authorizer challenges are skipped for all peers in both msgr 1 > and msgr2 cases, disabling the protection that was put in place in commit > f80b848d3f83 ("auth/cephx: add authorizer challenge", CVE-2018-1128). > > Proposed Patch: > See attached. > > We have assigned it a CVE of CVE-2020-25677 at Red Hat. > > Credits to Ilya Dryomov > > https://www.cvedetails.com/cve/CVE-2018-1128/ > > Ana McTaggart > > Red Hat Product Security > > Red Hat Remote <https://www.redhat.com> > > > secalert@...hat.com for urgent response > > > amct@...hat.com > > > M: 7742790791 IM: amctagga > > > Pronouns:They/Them/Theirs > >
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