Bug 1720114 (CVE-2019-10166) - CVE-2019-10166 libvirt: virDomainManagedSaveDefineXML API exposed to readonly clients
Summary: CVE-2019-10166 libvirt: virDomainManagedSaveDefineXML API exposed to readonly...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-10166
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=important,public=20190620:1200...
Depends On: 1720512 1720524 1720498 1720502 1720507 1720516 1720520 1720528 1720530 1722462 1722465
Blocks: 1718800
TreeView+ depends on / blocked
 
Reported: 2019-06-13 07:53 UTC by Doran Moppert
Modified: 2019-08-06 21:51 UTC (History)
32 users (show)

Fixed In Version: libvirt 4.10.1, libvirt 5.4.1
Doc Type: If docs needed, set a value
Doc Text:
It was discovered that libvirtd would permit readonly clients to use the virDomainManagedSaveDefineXML() API, which would permit them to modify managed save state files. If a managed save had already been created by a privileged user, a local attacker could modify this file such that libvirtd would execute an arbitrary program when the domain was resumed.
Clone Of:
Environment:
Last Closed: 2019-07-12 13:07:40 UTC


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2019:1854 None None None 2019-07-25 08:59:16 UTC
Red Hat Product Errata RHSA-2019:1579 None None None 2019-06-20 15:33:25 UTC
Red Hat Product Errata RHSA-2019:1580 None None None 2019-06-20 15:48:25 UTC
Red Hat Product Errata RHSA-2019:1699 None None None 2019-07-08 09:19:05 UTC
Red Hat Product Errata RHSA-2019:1762 None None None 2019-07-11 16:26:04 UTC

Description Doran Moppert 2019-06-13 07:53:24 UTC
It was discovered that libvirtd would permit readonly clients to use the
virDomainManagedSaveDefineXML() API, which would permit them to modify 
managed save state files.  If a managed save had already been created by 
a privileged user, a local attacker could modify this file such that 
libvirtd would execute an arbitrary program when the domain was resumed.

This vulnerability was first present in libvirt v3.6.1.

Comment 4 Hardik Vyas 2019-06-19 07:09:56 UTC
Statement:

* This vulnerability requires access to the libvirt socket, normally in /var/run/libvirt/libvirt_sock_ro.  Typically in hypervisor environments, local user accounts are not supported so no untrusted users should be able to access this socket.
* Red Hat Gluster Storage 3 is not affected by this vulnerability as libvirtd daemon is not shipped in Gluster.

Comment 5 Doran Moppert 2019-06-20 02:05:40 UTC
External References:

https://access.redhat.com/libvirt-privesc-vulnerabilities

Comment 6 Doran Moppert 2019-06-20 02:05:42 UTC
Mitigation:

The Unix permissions of libvirt's read-only socket can be made more restrictive than the default (0777) by editing `/etc/libvirt/libvirtd.conf`.  The settings `unix_sock_group = libvirt` and `unix_sock_ro_perms = 0770` will restrict access to only members of `libvirt`, who already have management access to virtual machines.

Comment 8 Doran Moppert 2019-06-20 12:14:20 UTC
Created libvirt tracking bugs for this issue:

Affects: fedora-all [bug 1722462]


Created mingw-libvirt tracking bugs for this issue:

Affects: fedora-all [bug 1722465]

Comment 9 errata-xmlrpc 2019-06-20 15:33:23 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:1579 https://access.redhat.com/errata/RHSA-2019:1579

Comment 10 errata-xmlrpc 2019-06-20 15:48:23 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:1580 https://access.redhat.com/errata/RHSA-2019:1580

Comment 11 Doran Moppert 2019-07-02 04:32:03 UTC
Acknowledgments:

Name: Matthias Gerstner (SUSE)

Comment 13 errata-xmlrpc 2019-07-08 09:19:03 UTC
This issue has been addressed in the following products:

  Red Hat Virtualization 4 for Red Hat Enterprise Linux 7

Via RHSA-2019:1699 https://access.redhat.com/errata/RHSA-2019:1699

Comment 14 errata-xmlrpc 2019-07-11 16:26:02 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8 Advanced Virtualization

Via RHSA-2019:1762 https://access.redhat.com/errata/RHSA-2019:1762

Comment 15 Product Security DevOps Team 2019-07-12 13:07:40 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-2019-10166


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