CVE-2021-20288

Published: 15 April 2021

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.

From the Ubuntu security team

It was discovered that Ceph contained an authentication flaw, leading to key reuse. An attacker could use this to cause a denial of service or possibly impersonate another user.

Priority

Medium

CVSS 3 base score: 7.2

Status

Package Release Status
ceph
Launchpad, Ubuntu, Debian
Upstream
Released (15.2.11,16.2.1)
Ubuntu 21.04 (Hirsute Hippo) Needed

Ubuntu 20.04 LTS (Focal Fossa)
Released (15.2.12-0ubuntu0.20.04.1)
Ubuntu 18.04 LTS (Bionic Beaver) Needs triage

Ubuntu 16.04 ESM (Xenial Xerus) Needs triage

Ubuntu 14.04 ESM (Trusty Tahr) Needs triage

Patches:
Upstream: https://github.com/ceph/ceph/commit/059eabcc0ada81078a898cdc25cf72bf3d506ad0
Upstream: https://github.com/ceph/ceph/commit/05b3b6a305ddbb56cc53bbeadf5866db4d785f49