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RedHat: RHSA-2019-2889-01 Major Buffer Overflow Risk in Virtualization Host

red hat
Calendar Grey September 24, 2019
Dist Redhat Esm H88
Stay informed about an important security fix for Red Hat Virtualization addressing a significant buffer overflow flaw impacting systems.
An update for redhat-release-virtualization-host and redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7

Solution

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

https://access.redhat.com/articles/2974891

Summary

The redhat-virtualization-host packages provide the Red Hat Virtualization Host. 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 following packages have been upgraded to a later upstream version: redhat-release-virtualization-host (4.3.5), redhat-virtualization-host (4.3.5). (BZ#1751436, BZ#1754063)
Security Fix(es):
* A buffer overflow flaw was found in the way Linux kernel's vhost functionality that translates virtqueue buffers to IOVs, logged the buffer descriptors during migration. A privileged guest user able to pass descriptors with invalid length to the host when migration is underway, could use this flaw to increase their privileges on the host. (CVE-2019-14835)
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.

Topics%20covered

Topics Covered

security advisory buffer overflow redhat important update red hat virtualization

References

https://access.redhat.com/security/cve/CVE-2019-14835 https://access.redhat.com/security/vulnerabilities/kernel-vhost https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Virtualization 4 Hypervisor for RHEL 7:
Source: redhat-virtualization-host-4.3.5-20190920.0.el7_7.src.rpm
noarch: redhat-virtualization-host-image-update-4.3.5-20190920.0.el7_7.noarch.rpm
RHEL 7-based RHEV-H for RHEV 4 (build requirements):
Source: redhat-release-virtualization-host-4.3.5-4.el7ev.src.rpm redhat-virtualization-host-4.3.5-20190920.0.el7_7.src.rpm
noarch: redhat-virtualization-host-image-update-4.3.5-20190920.0.el7_7.noarch.rpm redhat-virtualization-host-image-update-placeholder-4.3.5-4.el7ev.noarch.rpm
x86_64: redhat-release-virtualization-host-4.3.5-4.el7ev.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/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2019:2889-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2889
Issue date: 2019-09-24

Topic

An update for redhat-release-virtualization-host andredhat-virtualization-host is now available for Red Hat Virtualization 4for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory buffer overflow redhat important update red hat virtualization

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

Bugs Fixed

1750727 - CVE-2019-14835 kernel: vhost-net: guest to host kernel escape during migration

1754063 - Rebase RHV-H 4.3.5 on RHEL 7.7

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