Bug 1635926 (CVE-2018-14660)

Summary:	CVE-2018-14660 glusterfs: Repeat use of "GF_META_LOCK_KEY" xattr allows for memory exhaustion
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, anoopcs, atumball, bmcclain, carnil, dbaker, dblechte, dfediuck, eedri, humble.devassy, jokerman, jonathansteffan, kkeithle, matthias, mgoldboi, michal.skrivanek, ndevos, public, ramkrsna, rhs-bugs, sankarshan, sbonazzo, security-response-team, sfowler, sherold, sisharma, ssaha, sthangav, trankin, vbellur
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in glusterfs server which allowed repeated usage of GF_META_LOCK_KEY xattr. A remote, authenticated attacker could use this flaw to create multiple locks for single inode by using setxattr repetitively resulting in memory exhaustion of glusterfs server node.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:39:10 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:	1616829, 1636308
Bug Blocks:	1635927, 1644080

Description Sam Fowler 2018-10-04 00:51:10 UTC

The Gluster file system through versions 4.1.4 and 3.1.2 is vulnerable to a denial of service attack via use of the "GF_META_LOCK_KEY" xattr. A remote, authenticated attacker could exploit this by mounting a Gluster volume and repeatedly calling "setxattr(2)" to trigger an out-of-memory error and resultant denial of service.

Comment 1 Sam Fowler 2018-10-04 00:51:20 UTC

Acknowledgments:

Name: Michael Hanselmann (hansmi.ch)

Comment 5 Doran Moppert 2018-10-30 00:21:19 UTC

Statement:

This issue did not affect Red Hat Enterprise Linux 6 and 7 as the flaw is present in glusterfs-server, which is not shipped there.

This flaw affects glusterfs versions included in Red Hat Virtualization 4 Hypervisor. However, in recommended configurations, the vulnerability is only exposed to hypervisor administrators and can not be exploited from virtual machines or other hosts on the network.

Comment 6 errata-xmlrpc 2018-10-31 08:43:38 UTC

This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.4 for RHEL 6
  Native Client for RHEL 6 for Red Hat Storage

Via RHSA-2018:3431 https://access.redhat.com/errata/RHSA-2018:3431

Comment 7 errata-xmlrpc 2018-10-31 08:44:30 UTC

This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.4 for RHEL 7
  Native Client for RHEL 7 for Red Hat Storage

Via RHSA-2018:3432 https://access.redhat.com/errata/RHSA-2018:3432

Comment 8 Salvatore Bonaccorso 2018-11-01 20:28:59 UTC

Any information on upstream fix for this issue?

Comment 9 Siddharth Sharma 2018-11-02 04:34:32 UTC

upstream fix:

https://review.gluster.org/#/c/glusterfs/+/21531/

Comment 10 Salvatore Bonaccorso 2018-11-02 12:56:20 UTC

Siddharth, here and for the other bugreports: thanks for updating the information!

Comment 11 errata-xmlrpc 2018-11-05 14:58:38 UTC

This issue has been addressed in the following products:

  Red Hat Virtualization 4 for Red Hat Enterprise Linux 7

Via RHSA-2018:3470 https://access.redhat.com/errata/RHSA-2018:3470