Bug 1811712 (CVE-2020-1759)

Summary:	CVE-2020-1759 ceph: secure mode of msgr2 breaks both confidentiality and integrity aspects for long-lived sessions
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anharris, bniver, danmick, david, fedora, gfidente, hvyas, idryomov, i, jdurgin, jjoyce, josef, jschluet, lhh, loic, lpeer, mburns, nojha, ramkrsna, rzarzyns, sclewis, slinaber, sostapov, steve
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ceph 15.2.1, ceph 14.2.9	Doc Type:	If docs needed, set a value
Doc Text:	A nonce reuse vulnerability was discovered in the secure mode of the messenger v2 protocol, which can allow an attacker to forge auth tags and potentially manipulate the data by leveraging the reuse of a nonce in a session. Messages encrypted using a reused nonce value are susceptible to serious confidentiality and integrity attacks.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	1812762, 1812763, 1812773, 1821586
Bug Blocks:	1811724

Description Marian Rehak 2020-03-09 15:27:57 UTC

A flaw was found, where there's a problem with the secure mode of msgr2, which breaks confidentiality and integrity aspects for long-lived sessions.

Comment 3 Hardik Vyas 2020-03-12 05:15:04 UTC

Acknowledgments:

Name: Ilya Dryomov (Red Hat)

Comment 8 Hardik Vyas 2020-04-07 06:57:08 UTC

Created ceph tracking bugs for this issue:

Affects: fedora-all [bug 1821586]

Comment 9 Hardik Vyas 2020-04-07 07:05:53 UTC

Upstream Patches:

https://github.com/ceph/ceph-ci/commit/84d2e215969cde830b086d11544aeb3666614211
https://github.com/ceph/ceph-ci/commit/659ec7dc6e30fe961832f813da007f49e603a33d

The patches are currently available from ceph.git clone(ceph-ci) and will be pushed to active releases soon.

Comment 10 Hardik Vyas 2020-04-13 09:34:19 UTC

Patches are merged in upstream Octopus version 15.2.1 via PR https://github.com/ceph/ceph/pull/34482

https://github.com/ceph/ceph/commit/20b7bb685c5ea74c651ca1ea547ac66b0fee7035
https://github.com/ceph/ceph/commit/dfd1d81cec62e21e21696dc87d4db5f920e51a67

Comment 11 Hardik Vyas 2020-04-13 09:34:30 UTC

External References:

https://www.openwall.com/lists/oss-security/2020/04/07/2

Comment 13 Hardik Vyas 2020-04-14 05:49:17 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 14 Hardik Vyas 2020-04-15 13:56:10 UTC

Nautilus fixes v14.2.9:

https://github.com/ceph/ceph/commit/47c7e623546a7a33bd6bbddfb899fa9c9a40f40a
https://github.com/ceph/ceph/commit/f6c5ad8a5f534d73cba9c6bd794a89e879c46ecc

Comment 15 Riccardo Schirone 2020-04-24 10:40:18 UTC

This flaw was introduced in commit https://github.com/ceph/ceph/commit/fe387e02b11df98357d8cdbfa3b1f1d5f2bb3f74 ("msg/async, v2: drop depedency on uint128_t. Clean up onwire crypto.")

Comment 16 Riccardo Schirone 2020-04-24 10:43:03 UTC

Statement:

Red Hat Ceph Storage 4 and Red Hat Openshift Container Storage 4.2 are affected by this vulnerability as reuse of a nonce is possible with the shipped versions of ceph.

Red Hat Ceph Storage 2 and 3 are not affected by this vulnerability  as they do not provide support for secure mode of messenger v2 protocol.

This issue did not affect the versions of ceph as shipped with Red Hat Enterprise Linux 8 as they did not include support for secure mode of messenger v2 protocol.