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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
Red Hat Enterprise Virtualization Path Validation Flaw in 'reposync' Lets Remote Users Modify Files on the Target System
SecurityTracker Alert ID:  1041594
SecurityTracker URL:  http://securitytracker.com/id/1041594
CVE Reference:   CVE-2018-10897   (Links to External Site)
Date:  Sep 4 2018
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4
Description:   A vulnerability was reported in Red Hat Enterprise Virtualization. A remote user can modify files on the target system.

The 'reposync' component of 'yum-utils' does not properly validate paths in remote repository configuration files.

A remote user in control of a repository can return specially crafted data to the connected target user to overwrite files on the target user's system.

Jay Grizzard (Clover Network) and Aaron Levy (Clover Network) reported this vulnerability.

Impact:   A remote user in control of a repository can overwrite files on the target user's system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:2626

Vendor URL:  access.redhat.com/errata/RHSA-2018:2626 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   None.


 Source Message Contents

Subject:  [RHSA-2018:2626-01] Important: Red Hat Virtualization security, bug fix, and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: Red Hat Virtualization security, bug fix, and enhancement update
Advisory ID:       RHSA-2018:2626-01
Product:           Red Hat Virtualization
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2626
Issue date:        2018-09-04
CVE Names:         CVE-2018-10897 
=====================================================================

1. Summary:

An update for redhat-virtualization-host is now available for Red Hat
Virtualization 4 for Red Hat Enterprise Linux 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
tasks.

The ovirt-node-ng 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 tasks.

Security Fix(es):

* yum-utils: reposync: improper path validation may lead to directory
traversal (CVE-2018-10897)

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 Jay Grizzard (Clover Network) and Aaron Levy
(Clover Network) for reporting this issue.

Bug fix:

* This update rebases imgbased to version 1.0.24. This update fixes the
issue with removing broken symlinks when synchronizing layers. (BZ#1598781)
(BZ#1622025)

4. Solution:

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

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1598781 - Upgrading RHV-H is bringing back libvirt network file which causes issues in starting of VM
1600221 - CVE-2018-10897 yum-utils: reposync: improper path validation may lead to directory traversal
1616254 - [Tracker] RHV-H tracker for RHVH 4.2.6
1622025 - Upgrade imgbased to 1.0.24

6. Package List:

Red Hat Virtualization 4 Hypervisor for RHEL 7:

Source:
redhat-virtualization-host-4.2-20180828.2.el7_5.src.rpm

noarch:
redhat-virtualization-host-image-update-4.2-20180828.2.el7_5.noarch.rpm

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

Source:
imgbased-1.0.24-1.el7ev.src.rpm
redhat-release-virtualization-host-4.2-6.0.el7.src.rpm

noarch:
imgbased-1.0.24-1.el7ev.noarch.rpm
python-imgbased-1.0.24-1.el7ev.noarch.rpm
redhat-virtualization-host-image-update-placeholder-4.2-6.0.el7.noarch.rpm

x86_64:
redhat-release-virtualization-host-4.2-6.0.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-10897
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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