CVE-2021-20288 Auth bypass in ceph

High 7.2 Published 15 Apr 2021 Updated 3 Aug 2024

Attackers can reuse authentication keys to access other users' data, compromising confidentiality, integrity, and availability in Ceph clusters.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-20288?

CVE-2021-20288 is a high-severity authentication bypass vulnerability in Debian Debian Linux, published on 15 Apr 2021. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

An authentication flaw was found in ceph in versions before 14.2.20. When the monitor handles CEPHX_GET_AUTH_SESSION_KEY requests, it doesn't sanitize other_keys, allowing key reuse. An attacker who can request a global_id can exploit the ability of any user to request a global_id previously associated with another user, as ceph does not force the reuse of old keys to generate new ones. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Weakness: CWE-287

Which versions are affected by CVE-2021-20288?

1 open source package ship an affected version, including ceph. It affects 4 products.

Package	Affected	Fixed in
`ceph` Bitnami	All versions	`14.2.21`

Linux distribution packages (32)

`ceph` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-base` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-common` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-debuginfo` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-fuse` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-mds` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-mgr` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-mon` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-osd` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-radosgw` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-selinux` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph-test` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`libcephfs-devel` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`libcephfs2` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`librados-devel` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`librados2` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`libradosstriper1` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`librbd-devel` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`librbd1` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`librgw-devel` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`librgw2` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`python-cephfs` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`python-rados` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`python-rbd` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`python-rgw` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`rbd-mirror` Red Hat:ceph_storage:3::el7	All versions	`2:12.2.12-141.el7cp`
`ceph` SUSE:Enterprise Storage 7	All versions	`15.2.11.83+g8a15f484c2-3.20.1`
`ceph` SUSE:Linux Enterprise Module for Basesystem 15 SP2	All versions	`15.2.11.83+g8a15f484c2-3.20.1`
`ceph` SUSE:Linux Enterprise Module for Basesystem 15 SP3	All versions	`15.2.11.83+g8a15f484c2-3.20.1`
`ceph` openSUSE:Leap 15.2	All versions	`15.2.11.83+g8a15f484c2-lp152.2.15.1`
`ceph-test` openSUSE:Leap 15.2	All versions	`15.2.11.83+g8a15f484c2-lp152.2.15.1`
`benji` openSUSE:Tumbleweed	All versions	`0.15.0-1.2`

Products include Debian Debian Linux, Fedoraproject Fedora, Linuxfoundation Ceph, Redhat Ceph Storage.

How do I fix CVE-2021-20288?

Upgrade ceph to 14.2.21 or later.

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

Is CVE-2021-20288 being exploited?

There is no known exploitation of CVE-2021-20288 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as BIT-ceph-2021-20288, DEBIAN-CVE-2021-20288, GHSA-39jx-6759-44c6, MGASA-2021-0207, OESA-2022-1715, RHSA-2022:1394 and 4 more.