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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
Red Hat Enterprise Virtualization Integer Overflows in procps-ng Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1041057
SecurityTracker URL:
CVE Reference:   CVE-2018-1124, CVE-2018-1126   (Links to External Site)
Date:  Jun 11 2018
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Two vulnerabilities were reported in Red Hat Enterprise Virtualization. A local user can obtain elevated privileges on the target system.

A local user can trigger an integer overflow and resulting heap overflow in file2strvec to execute arbitrary code with elevated privileges [CVE-2018-1124].

A local user can trigger an integer truncation error in [CVE-2018-1126].

The vulnerability resides in the procps-ng component.

Qualys Research Labs reported these vulnerabilities.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   None.

 Source Message Contents

Subject:  [RHSA-2018:1820-01] Important: Red Hat Virtualization security, bug fix, and enhancement update

Hash: SHA256

                   Red Hat Security Advisory

Synopsis:          Important: Red Hat Virtualization security, bug fix, and enhancement update
Advisory ID:       RHSA-2018:1820-01
Product:           Red Hat Virtualization
Advisory URL:
Issue date:        2018-06-11
CVE Names:         CVE-2018-1124 CVE-2018-1126 

1. Summary:

An update for imgbased, redhat-release-virtualization-host, and
redhat-virtualization-host is now available for Red Hat Virtualization 4
for RHEL-7.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

RHEL 7-based RHEV-H for RHEV 4 (build requirements) - noarch, x86_64
Red Hat Virtualization 4 Hypervisor for RHEL 7 - noarch

3. Description:

The redhat-virtualization-host packages provide the Red Hat Virtualization
Host. These packages include redhat-release-virtualization-host,
ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are
installed using a special build of Red Hat Enterprise Linux with only the
packages required to host virtual machines. RHVH features a Cockpit user
interface for monitoring the host's resources and performing administrative

Security Fix(es):

* procps-ng, procps: Integer overflows leading to heap overflow in
file2strvec (CVE-2018-1124)

* procps-ng, procps: incorrect integer size in proc/alloc.* leading to
truncation / integer overflow issues (CVE-2018-1126)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Qualys Research Labs for reporting these

Bug Fix(es):

* Previously some SELinux %post scripts were not re-executed because
imgbased attempts to re-execute RPM %post scripts which involve SELinux
commands inside a namespace, and some commands failed due to SELinux
namespacing rules.

This update ensures that SELinux contexts inside imgbased update namespaces
now update appropriately, and the scripts are re-executed by remounting
/sys and /sys/fs/selinux inside the update namespace. (BZ#1571607)

* Previously, vmcore files that were created by kdump were not relabelled
by kdumpctl after a reboot. As a result, Rsync returned an error when
trying to remove the security.selinux attribute while syncing unlabelled
files, as this is forbidden by selinux.

In this release, restorecon is run on the source directory before syncing
it, which enables the files to be synchronized with the correct labels.


* Previously, imgbased filtered out stderr from LVM commands to improve
parsing reliability. In this release, imgbased now logs stderr from LVM
commands in order to provide this information in the imgbased logs, for
example during an upgrade failure. (BZ#1574187)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

5. Bugs fixed (

1571607 - Failed to open socket to sanlock daemon
1573334 - RHV-H update to latest version fails on RHV 4.1 due to yum transaction failure
1574187 - [RFE] provide LVM stderr in imgbased if an exception is caught
1575465 - CVE-2018-1124 procps-ng, procps: Integer overflows leading to heap overflow in file2strvec
1575853 - CVE-2018-1126 procps-ng, procps: incorrect integer size in proc/alloc.* leading to truncation / integer overflow issues
1575922 - RHVH 4.2 upgrade failed from 4.1 wrapper to wrapper
1579141 - [RHV4.2] unable to upgrade Host 4.1 (rhvh-4.1-0.20180126.0)  to RHVH 4.2 (rhvh-
1582433 - Upgrade imgbased to 1.0.17

6. Package List:

Red Hat Virtualization 4 Hypervisor for RHEL 7:



RHEL 7-based RHEV-H for RHEV 4 (build requirements):




These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>. More contact
details at

Copyright 2018 Red Hat, Inc.
Version: GnuPG v1


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