Bug 1860069 (CVE-2020-14339)

Summary: CVE-2020-14339 libvirt: leak of /dev/mapper/control into QEMU guests
Product: [Other] Security Response Reporter: Mauro Matteo Cascella <mcascell>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: agedosier, berrange, clalancette, eblake, erik-fedora, itamar, jdenemar, jforbes, jsuchane, knoel, laine, libvirt-maint, marcandre.lureau, pkrempa, rjones, veillard, virt-maint, virt-maint
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: libvirt 6.6.0 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU process. This file descriptor allows for privileged operations to happen against the device-mapper on the host. This flaw allows a malicious guest user or process to perform operations outside of their standard permissions, potentially causing serious damage to the host operating system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-09-01 13:17:34 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1860098, 1860421, 1860874, 1860875, 1881034, 1881035, 1910618    
Bug Blocks: 1859205    

Description Mauro Matteo Cascella 2020-07-23 16:24:34 UTC
It was discovered that libvirt is accidentally leaking a file descriptor for /dev/mapper/control into the QEMU process. This file descriptor allows for privileged operations to be made against device mapper on the host. Thus a malicious QEMU has the potential to do serious damage to the host OS.

Upstream fix:

Comment 4 Mauro Matteo Cascella 2020-07-25 14:37:04 UTC

Name: Daniel Berrange (Red Hat)

Comment 8 Mauro Matteo Cascella 2020-07-28 08:23:08 UTC

This flaw was introduced in `libvirt` version 6.2.0. Red Hat Enterprise Linux 5, 6, 7, and 8 are not affected by this issue as they shipped an older version of the `libvirt` package which did not include the vulnerable code.

This issue affects versions of the `libvirt` package as shipped with Red Hat Enterprise Linux Advanced Virtualization 8. Future `libvirt` package updates for Red Hat Enterprise Linux Advanced Virtualization 8 may address this issue.

Comment 9 Mauro Matteo Cascella 2020-07-28 08:38:35 UTC

This issue is mitigated on Red Hat Enterprise Linux if SELinux is in enforcing mode, which prevents the `/dev/mapper/control` file descriptor from being accessible by a guest user/process.

Comment 11 errata-xmlrpc 2020-09-01 09:38:54 UTC
This issue has been addressed in the following products:

  Advanced Virtualization for RHEL 8.2.1

Via RHSA-2020:3586 https://access.redhat.com/errata/RHSA-2020:3586

Comment 12 Product Security DevOps Team 2020-09-01 13:17:34 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


Comment 13 Mauro Matteo Cascella 2020-09-21 12:08:16 UTC
Created mingw-libvirt tracking bugs for this issue:

Affects: fedora-all [bug 1881035]

Comment 14 errata-xmlrpc 2020-11-04 02:52:57 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4676 https://access.redhat.com/errata/RHSA-2020:4676