Bug 1720117 (CVE-2019-10167) - CVE-2019-10167 libvirt: arbitrary command execution via virConnectGetDomainCapabilities API
Summary: CVE-2019-10167 libvirt: arbitrary command execution via virConnectGetDomainCa...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-10167
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:
Depends On: 1720495 1720499 1720503 1720511 1720515 1720519 1720523 1720527 1721492 1722464 1722468
Blocks: 1718800
TreeView+ depends on / blocked
 
Reported: 2019-06-13 07:54 UTC by Doran Moppert
Modified: 2024-03-20 10:15 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:
The virConnectGetDomainCapabilities() libvirt API accepts an "emulatorbin" argument to specify the program providing emulation for a domain. Since v1.2.19, libvirt will execute that program to probe the domain's capabilities. Read-only clients could specify an arbitrary path for this argument, causing libvirtd to execute a crafted executable with its own privileges.
Clone Of:
Environment:
Last Closed: 2019-07-12 13:07:44 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2019:1854 0 None None None 2019-07-25 08:59:19 UTC
Red Hat Product Errata RHSA-2019:1579 0 None None None 2019-06-20 15:33:27 UTC
Red Hat Product Errata RHSA-2019:1580 0 None None None 2019-06-20 15:48:28 UTC
Red Hat Product Errata RHSA-2019:1699 0 None None None 2019-07-08 09:19:09 UTC
Red Hat Product Errata RHSA-2019:1762 0 None None None 2019-07-11 16:26:05 UTC

Description Doran Moppert 2019-06-13 07:54:18 UTC 
The virConnectGetDomainCapabilities() libvirt API accepts an "emulatorbin" 
argument to specify the program providing emulation for a domain.  Since 
v1.2.19, libvirt will execute that program to probe the domain's 
capabilities.  Read-only clients could specify an arbitrary path for this 
argument, causing libvirtd to execute a crafted executable with its own 
privileges.
Comment 6 Doran Moppert 2019-06-18 04:49:32 UTC 
Acknowledgments:

Name: Jan Tomko (Red Hat)
Comment 8 Hardik Vyas 2019-06-19 07:10:42 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 9 Doran Moppert 2019-06-20 02:05:40 UTC 
External References:

https://access.redhat.com/libvirt-privesc-vulnerabilities
Comment 10 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 11 Doran Moppert 2019-06-20 12:13:47 UTC 
Upstream patch:

https://libvirt.org/git/?p=libvirt.git;a=commit;h=8afa68bac0cf99d1f8aaa6566685c43c22622f26
Comment 12 Doran Moppert 2019-06-20 12:14:24 UTC 
Created libvirt tracking bugs for this issue:

Affects: fedora-all [bug 1722464]


Created mingw-libvirt tracking bugs for this issue:

Affects: fedora-all [bug 1722468]
Comment 13 errata-xmlrpc 2019-06-20 15:33:25 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 14 errata-xmlrpc 2019-06-20 15:48:26 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 16 errata-xmlrpc 2019-07-08 09:19:06 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 17 errata-xmlrpc 2019-07-11 16:26:04 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 18 Product Security DevOps Team 2019-07-12 13:07:44 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-2019-10167
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