CVE-2020-25660 Auth bypass in ceph

High 8.8 Published 23 Nov 2020 Updated 4 Aug 2024

An attacker on the cluster network can bypass Cephx authentication via replay attacks to perform unauthorized actions on the Ceph service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2020-25660?

CVE-2020-25660 is a high-severity authentication bypass vulnerability in Fedoraproject Fedora, published on 23 Nov 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the Cephx authentication protocol in versions before 15.2.6 and before 14.2.14, where it does not verify Ceph clients correctly and is then vulnerable to replay attacks in Nautilus. This flaw allows an attacker with access to the Ceph cluster network to authenticate with the Ceph service via a packet sniffer and perform actions allowed by the Ceph service. This issue is a reintroduction of CVE-2018-1128, affecting the msgr2 protocol. The msgr 2 protocol is used for all communication except older clients that do not support the msgr2 protocol. The msgr1 protocol is not affected. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.

Weakness: CWE-294

Which versions are affected by CVE-2020-25660?

It affects 4 products.

Linux distribution packages (40)

`ceph` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-base` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-common` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-debuginfo` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-fuse` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-grafana-dashboards` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-mds` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-mgr` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-mgr-dashboard` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-mgr-diskprediction-local` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-mgr-k8sevents` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-mgr-rook` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-mon` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-osd` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-radosgw` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-selinux` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph-test` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`libcephfs-devel` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`libcephfs2` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`librados-devel` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`librados2` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`libradospp-devel` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`libradosstriper1` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`librbd-devel` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`librbd1` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`librgw-devel` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`librgw2` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`python-ceph-argparse` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`python-cephfs` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`python-rados` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`python-rbd` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`python-rgw` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`rbd-mirror` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`rbd-nbd` Red Hat:ceph_storage:4::el7	All versions	`2:14.2.8-115.el7cp`
`ceph` Red Hat:ceph_storage:4::el8	All versions	`2:14.2.8-115.el8cp`
`ceph-base` Red Hat:ceph_storage:4::el8	All versions	`2:14.2.8-115.el8cp`
`ceph-base-debuginfo` Red Hat:ceph_storage:4::el8	All versions	`2:14.2.8-115.el8cp`
`ceph-common` Red Hat:ceph_storage:4::el8	All versions	`2:14.2.8-115.el8cp`
`ceph-common-debuginfo` Red Hat:ceph_storage:4::el8	All versions	`2:14.2.8-115.el8cp`
`ceph-debugsource` Red Hat:ceph_storage:4::el8	All versions	`2:14.2.8-115.el8cp`

Products include Fedoraproject Fedora, Redhat Ceph, Redhat Ceph Storage, Redhat Openshift Container Platform.

How do I fix CVE-2020-25660?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-25660 being exploited?

There is no known exploitation of CVE-2020-25660 in the wild and no public exploit code.

All Fedoraproject Fedora vulnerabilities

Sources

Also known as DEBIAN-CVE-2020-25660, GHSA-457q-vj84-7r8r, RHSA-2020:5325, SUSE-SU-2020:3459-1, SUSE-SU-2020:3473-1, SUSE-SU-2020:3473-2 and 4 more.