Bug 1637327 (CVE-2018-14662)

Summary:	CVE-2018-14662 ceph: authenticated user with read only permissions can steal dm-crypt / LUKS key
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	branto, danmick, david, fedora, i, jdillama, josef, kdreyer, kkeithle, loic, ramkrsna, security-response-team, sisharma, steve
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ceph 13.2.4	Doc Type:	If docs needed, set a value
Doc Text:	It was found that authenticated ceph user with read only permissions could steal dm-crypt encryption keys used in ceph disk encryption.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-08-21 20:47:04 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1637411, 1637412, 1665972, 1826132
Bug Blocks:	1628199

Description Sam Fowler 2018-10-09 06:16:16 UTC

The Ceph documentation states that clients should use "allow r" mon caps[1][2][3], which will grant full read access to all config-keys stored in the monitor -- including the LUKS encryption keys for OSD.

This is in contrast to the original dm-crypt key management feature[4], which indicates that these keys should be restricted to only the lockbox user.


Upstream Documentation:

[1] http://docs.ceph.com/docs/master/cephfs/client-auth/
[2] http://docs.ceph.com/docs/emperor/rados/operations/authentication/#add-a-key
[3] http://docs.ceph.com/docs/master/rados/operations/user-management/#add-a-user
[4] https://tracker.ceph.com/projects/ceph/wiki/Osd_-_simple_ceph-mon_dm-crypt_key_management

Comment 4 Siddharth Sharma 2019-01-14 15:18:37 UTC

External References:

https://ceph.com/releases/13-2-4-mimic-released

Comment 5 Siddharth Sharma 2019-01-14 15:22:26 UTC

Created ceph tracking bugs for this issue:

Affects: fedora-all [bug 1665972]

Comment 6 Siddharth Sharma 2019-01-15 03:45:10 UTC

upstream fix

https://github.com/ceph/ceph/commit/a2acedd2a7e12d58af6db35edbd8a9d29c557578

Comment 7 errata-xmlrpc 2019-08-21 15:10:19 UTC

This issue has been addressed in the following products:

  Red Hat Ceph Storage 3.3

Via RHSA-2019:2538 https://access.redhat.com/errata/RHSA-2019:2538

Comment 8 errata-xmlrpc 2019-08-21 15:22:08 UTC

This issue has been addressed in the following products:

  Red Hat Ceph Storage 3 for Red Hat Enterprise Linux 7

Via RHSA-2019:2541 https://access.redhat.com/errata/RHSA-2019:2541

Comment 9 Product Security DevOps Team 2019-08-21 20:47:04 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2018-14662