CVE-2020-25660

Publication date 23 November 2020

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.8 · High

Score breakdown

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

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

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)

Other references