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Bug 1613143 - (CVE-2018-10926) CVE-2018-10926 glusterfs: Device files can be created in arbitrary locations
CVE-2018-10926 glusterfs: Device files can be created in arbitrary locations
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20180904:0530...
: Security
Depends On: 1616829 1625088 1613686 1625086
Blocks: 1609600
  Show dependency tree / graph
 
Reported: 2018-08-07 02:16 EDT by Sam Fowler
Modified: 2018-09-11 03:30 EDT (History)
31 users (show)

See Also:
Fixed In Version: glusterfs-3.12.14, glusterfs-4.1.4
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in RPC request using gfs3_mknod_req supported by glusterfs server. An authenticated attacker could use this flaw to write files to an arbitrary location via path traversal and execute arbitrary code on a glusterfs server node.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2607 None None None 2018-09-04 02:25 EDT
Red Hat Product Errata RHSA-2018:2608 None None None 2018-09-04 02:27 EDT

  None (edit)
Description Sam Fowler 2018-08-07 02:16:01 EDT 
The Gluster filesystem allows for device files to be created in arbitrary locations via a mounted volume. This can be exploited by users with access to the storage server to read and write to the entire disk.
Comment 1 Sam Fowler 2018-08-07 02:16:13 EDT 
Acknowledgments:

Name: Michael Hanselmann (hansmi.ch)
Comment 4 Doran Moppert 2018-08-15 21:55:13 EDT 
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. For Red Hat Virtualization, Product Security has rated this flaw as Moderate. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Comment 6 Siddharth Sharma 2018-09-04 01:44:47 EDT 
Created glusterfs tracking bugs for this issue:

Affects: fedora-all [bug 1625086]
Comment 8 errata-xmlrpc 2018-09-04 02:25:32 EDT 
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-2018:2607 https://access.redhat.com/errata/RHSA-2018:2607
Comment 9 errata-xmlrpc 2018-09-04 02:26:54 EDT 
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-2018:2608 https://access.redhat.com/errata/RHSA-2018:2608
Comment 10 Siddharth Sharma 2018-09-04 10:55:32 EDT 
Mitigation:

To limit exposure of gluster server nodes :  

1. gluster server should be on LAN and not reachable from public networks.  
2. Use gluster auth.allow and auth.reject.  
3. Use TLS certificates to authenticate gluster clients.

caveat: This does not protect from attacks by authenticated gluster clients.
Comment 11 Siddharth Sharma 2018-09-05 03:43:44 EDT 
upstream fix:

https://review.gluster.org/21068
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