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Red Hat Product Errata RHSA-2018:2403 - Security Advisory
Issued:
2018-08-15
Updated:
2018-08-15

RHSA-2018:2403 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: redhat-virtualization-host security update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

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.

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.

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.

Security Fix(es):

  • Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks. (CVE-2018-3620, CVE-2018-3646)
  • A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390)

Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646 and Juha-Matti Tilli (Aalto University, Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5390.

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

Affected Products

  • Red Hat Virtualization 4 for RHEL 7 x86_64
  • Red Hat Virtualization Host 4 for RHEL 7 x86_64

Fixes

  • BZ - 1585005 - CVE-2018-3646 CVE-2018-3620 Kernel: hw: cpu: L1 terminal fault (L1TF)
  • BZ - 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)
  • BZ - 1614067 - [Tracker] Tracker for RHV-H for 4.2.5-2

CVEs

  • CVE-2018-3620
  • CVE-2018-3646
  • CVE-2018-5390

References

  • https://access.redhat.com/security/updates/classification/#important
  • https://access.redhat.com/security/vulnerabilities/L1TF
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Virtualization 4 for RHEL 7

SRPM
redhat-release-virtualization-host-4.2-5.2.el7.src.rpm SHA-256: 0c324a40e93456fc6a4d4bec6118470daa6e06156f83cc558d57fe36d8f00ace
x86_64
redhat-release-virtualization-host-4.2-5.2.el7.x86_64.rpm SHA-256: 3f33e0894dba9a45bec197de761360c8cd2e61f16cd549623f53b2a208f579ef
redhat-virtualization-host-image-update-placeholder-4.2-5.2.el7.noarch.rpm SHA-256: 6cae33bc92507d6c2735ddaae32ccc628b5e52d06329725194da06e5949fbb53

Red Hat Virtualization Host 4 for RHEL 7

SRPM
redhat-virtualization-host-4.2-20180813.0.el7_5.src.rpm SHA-256: b7ac4ece506d4b8a9dc26f6c82a61e4edf4a12378e3c46f1915efac0fd11cf51
x86_64
redhat-virtualization-host-image-update-4.2-20180813.0.el7_5.noarch.rpm SHA-256: ca6992b41755acbc63e4fae3608e471bd828213b01e6f7d45be3fd63f0234cd9

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

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