Bug 1720118 (CVE-2019-10168) - CVE-2019-10168 libvirt: arbitrary command execution via virConnectBaselineHypervisorCPU and virConnectCompareHypervisorCPU APIs
Summary: CVE-2019-10168 libvirt: arbitrary command execution via virConnectBaselineHyp...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-10168
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: 1720494 1720497 1720501 1720509 1720513 1720517 1720521 1720525 1721494 1722466 1722469
Blocks: 1718800
TreeView+ depends on / blocked
 
Reported: 2019-06-13 07:54 UTC by Doran Moppert
Modified: 2019-09-29 15:15 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 virConnectBaselineHypervisorCPU() and virConnectCompareHypervisorCPU() libvirt APIs accept an "emulator" 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 13:07:47 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 08:59:19 UTC
Red Hat Product Errata RHSA-2019:1579 None None None 2019-06-20 15:33:32 UTC
Red Hat Product Errata RHSA-2019:1580 None None None 2019-06-20 15:48:30 UTC
Red Hat Product Errata RHSA-2019:1699 None None None 2019-07-08 09:19:10 UTC
Red Hat Product Errata RHSA-2019:1762 None None None 2019-07-11 16:26:09 UTC

Description Doran Moppert 2019-06-13 07:54:32 UTC
The virConnectBaselineHypervisorCPU() and virConnectCompareHypervisorCPU()
libvirt APIs accept an "emulator" 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 3 Doran Moppert 2019-06-18 04:49:37 UTC
Acknowledgments:

Name: Jan Tomko (Red Hat)

Comment 7 Hardik Vyas 2019-06-19 07:12:46 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 8 Doran Moppert 2019-06-20 02:05:41 UTC
External References:

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

Comment 9 Doran Moppert 2019-06-20 02:05:44 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 12:14:26 UTC
Created libvirt tracking bugs for this issue:

Affects: fedora-all [bug 1722466]


Created mingw-libvirt tracking bugs for this issue:

Affects: fedora-all [bug 1722469]

Comment 12 errata-xmlrpc 2019-06-20 15:33:30 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 13 errata-xmlrpc 2019-06-20 15:48:28 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 15 errata-xmlrpc 2019-07-08 09:19:08 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 16 errata-xmlrpc 2019-07-11 16:26:08 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 17 Product Security DevOps Team 2019-07-12 13:07:47 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-2019-10168


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