CVE-2020-25660

Publication date 23 November 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ceph	20.10 groovy	Fixed 15.2.7-0ubuntu0.20.10.3
	20.04 LTS focal	Fixed 15.2.7-0ubuntu0.20.04.2
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

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.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
ceph	Upstream: 4a82c72 Upstream: 2927fd9 Upstream: 6c14c2f Upstream: 1316c82 Upstream: bafdfec

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-4706-1
Ceph vulnerabilities
28 January 2021