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CVE-2020-25660

Published: 23 November 2020

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.

Priority

Medium

CVSS 3 base score: 8.8

Status

Package Release Status
ceph
Launchpad, Ubuntu, Debian
Upstream
Released (15.2.6)
Ubuntu 20.04 LTS (Focal Fossa)
Released (15.2.7-0ubuntu0.20.04.2)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(code not present)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(code not present)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(code not present)
Patches:
Upstream: https://github.com/ceph/ceph/commit/4a82c72e3bdddcb625933e83af8b50a444b961f1 (15.1.x)
Upstream: https://github.com/ceph/ceph/commit/2927fd91d41e505237cc73f9700e5c6a63e5cb4f (14.2.x)
Upstream: https://github.com/ceph/ceph/commit/6c14c2fb5650426285428dfe6ca1597e5ea1d07d (15.2.6)
Upstream: https://github.com/ceph/ceph/commit/1316c82aae8c51b3fe10d8a8f0a87b60db54ee16 (15.2.6)
Upstream: https://github.com/ceph/ceph/commit/bafdfec8f974f1a3f7d404bcfd0a4cfad784937d (15.2.6)

Notes

AuthorNote
sbeattie
introduced in 321548010578d6ff7bbf2e5ce8a550008b131423 (15.1.0, backported to 14.2.5)
mdeslaur
fixed in 15.2.7-0ubuntu0.20.04.1 in focal-updates, and
15.2.7-0ubuntu0.20.10.1 in groovy-updates, but not yet in
security pocket.

References