Bug 1868883 (CVE-2020-15106)

Summary:	CVE-2020-15106 etcd: Large slice causes panic in decodeRecord method
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abishop, askrabec, bmontgom, dbecker, eparis, go-sig, gparvin, gscrivan, hvyas, jburrell, jcajka, jchaloup, jjoyce, jokerman, jramanat, jschluet, jweiser, kbasil, lacypret, lemenkov, lhh, lpeer, mburns, nstielau, puebele, rschiron, sbatsche, sclewis, slinaber, sponnaga, stcannon, strigazi, tfister, thee
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	etcd 3.4.10, etcd 3.3.23	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found In etcd, where a large slice causes panic in the decodeRecord method. The size of a record is stored in the length field of a WAL file, and no additional validation is performed on this data. Therefore, it is possible to forge an extremely large frame size that can unintentionally panic at the expense of any RAFT participant trying to decode the WAL. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-17 19:52:19 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:	1869286, 1868884, 1870189, 1870509, 1874769, 1874872, 1875653, 1875654, 1881175
Bug Blocks:	1868882

Description Dhananjay Arunesh 2020-08-14 06:39:12 UTC

In etcd before versions 3.3.23 and 3.4.10, a large slice causes panic in decodeRecord method. The size of a record is stored in the length field of a WAL file and no additional validation is done on this data. Therefore, it is possible to forge an extremely large frame size that can unintentionally panic at the expense of any RAFT participant trying to decode the WAL.

References:
https://github.com/etcd-io/etcd/security/advisories/GHSA-p4g4-wgrh-qrg2

Comment 1 Dhananjay Arunesh 2020-08-14 06:39:48 UTC

Created etcd tracking bugs for this issue:

Affects: fedora-all [bug 1868884]

Comment 3 Przemyslaw Roguski 2020-08-17 15:00:44 UTC

Upstream fix: https://github.com/etcd-io/etcd/commit/4571e528f49625d3de3170f219a45c3b3d38c675

Comment 4 Przemyslaw Roguski 2020-08-17 15:02:50 UTC

External References:

https://github.com/etcd-io/etcd/security/advisories/GHSA-p4g4-wgrh-qrg2

Comment 16 Summer Long 2020-09-07 05:14:37 UTC

Statement:

* In Red Hat OpenShift Container Platform (RHOCP), the affected components are behind OpenShift OAuth authentication. This restricts access to the vulnerable etcd to authenticated users only.
* In Red Hat OpenStack Platform (RHOSP), the use of etcd is limited to the internal API network, which is not accessible to OpenStack tenants.

The security impact for these products is therefore rated as Low.

Comment 21 errata-xmlrpc 2021-03-17 15:30:23 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 16.1

Via RHSA-2021:0916 https://access.redhat.com/errata/RHSA-2021:0916

Comment 22 Product Security DevOps Team 2021-03-17 19:52:19 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-2020-15106

Comment 23 errata-xmlrpc 2021-04-27 16:20:46 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extras

Via RHSA-2021:1407 https://access.redhat.com/errata/RHSA-2021:1407

Comment 24 errata-xmlrpc 2021-07-27 22:31:29 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.8

Via RHSA-2021:2438 https://access.redhat.com/errata/RHSA-2021:2438