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Red Hat Security Advisory 2018-0049-01

Red Hat Security Advisory 2018-0049-01
Posted Jan 6, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0049-01 - The ovirt-guest-agent-docker package provides the guest agent for Red Hat Linux Atomic Host virtual machines. The guest agent allows the Red Hat Virtualization Manager to receive internal guest events and retrieve information such as the IP address and the list of installed applications from the guest. Additionally the guest agent allows the Manager to execute specific commands, such as shut down or reboot, on guest virtual machines. Security Fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions. There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Variant CVE-2017-5715 triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation into the microprocessor's data cache even for speculatively executed instructions that never actually commit. As a result, an unprivileged attacker could use this flaw to cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks.

tags | advisory
systems | linux, redhat
MD5 | ca24b224fc698c0a257cdc9b741689fe

Red Hat Security Advisory 2018-0049-01

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

Synopsis: Important: ovirt-guest-agent-docker security and bug fix update
Advisory ID: RHSA-2018:0049-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2018:0049
Issue date: 2018-01-05
=====================================================================

1. Summary:

An update for ovirt-guest-agent-docker is now available for RHEV 4.X,
RHEV-H, and Agents 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. Description:

The ovirt-guest-agent-docker package provides the guest agent for Red Hat
Linux Atomic Host virtual machines. The guest agent allows the Red Hat
Virtualization Manager to receive internal guest events and retrieve
information such as the IP address and the list of installed applications
from the guest. Additionally the guest agent allows the Manager to execute
specific commands, such as shut down or reboot, on guest virtual machines.

Security Fix(es):

* An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of instructions (a commonly
used performance optimization). There are three primary variants of the
issue which differ in the way the speculative execution can be exploited.
Variant CVE-2017-5715 triggers the speculative execution by utilizing
branch target injection. It relies on the presence of a precisely-defined
instruction sequence in the privileged code as well as the fact that memory
accesses may cause allocation into the microprocessor's data cache even for
speculatively executed instructions that never actually commit (retire). As
a result, an unprivileged attacker could use this flaw to cross the syscall
and guest/host boundaries and read privileged memory by conducting targeted
cache side-channel attacks. (CVE-2017-5715)

Note: This is the ovirt-guest-agent-docker side of the CVE-2017-5715
mitigation.

Red Hat would like to thank Google Project Zero for reporting this issue.

Bug Fix(es):

* Previously, during Atomic host shutdown, the container was killed before
the Guest Agent had a chance to send 'session-shutdown' message to VDSM
host. This is now fixed. (BZ#1427849)

3. 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

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

1427849 - [atomic] The engine starts HA VM if the VM powered off from the guest OS
1519780 - CVE-2017-5715 hw: cpu: speculative execution branch target injection
1524695 - [Rebase] Rebuild of the ovirt-guest-agent container on top of latest RHEL 7.4

5. References:

https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/speculativeexecution
https://access.redhat.com/solutions/3307851
https://access.redhat.com/security/cve/CVE-2017-5715

6. 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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