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Red Hat Enterprise Linux 7: RHSA-2018:1675-01 Important: VDSM Cache Attack

red hat
Calendar Grey May 22, 2018
Scroller Redhat
Essential vdsm enhancement for Red Hat Virtualization addresses vulnerabilities linked to microprocessor architecture weaknesses concerning cache exploitation.
An update for vdsm 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/11258

Summary

The VDSM service is required by a Virtualization Manager to manage the Linux hosts. VDSM manages and monitors the host's storage, memory and networks as well as virtual machine creation, other host administration tasks, statistics gathering, and log collection.
Security Fix(es):
* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update 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 read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)
Note: This is the VDSM side of the CVE-2018-3639 mitigation.
Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.

Topics%20covered

Topics Covered

security advisory Red Hat Red Hat Enterprise Linux speculative execution cache side-channel VDSM Important security fix

References

https://access.redhat.com/security/cve/CVE-2018-3639 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/ssbd

Package List

Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts:
Source: vdsm-4.20.27.2-1.el7ev.src.rpm
noarch: vdsm-api-4.20.27.2-1.el7ev.noarch.rpm vdsm-client-4.20.27.2-1.el7ev.noarch.rpm vdsm-common-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-cpuflags-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-ethtool-options-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-fcoe-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-localdisk-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-macspoof-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-nestedvt-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-openstacknet-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-vfio-mdev-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-vhostmd-4.20.27.2-1.el7ev.noarch.rpm vdsm-hook-vmfex-dev-4.20.27.2-1.el7ev.noarch.rpm vdsm-http-4.20.27.2-1.el7ev.noarch.rpm vdsm-jsonrpc-4.20.27.2-1.el7ev.noarch.rpm vdsm-python-4.20.27.2-1.el7ev.noarch.rpm vdsm-yajsonrpc-4.20.27.2-1.el7ev.noarch.rpm
ppc64le: vdsm-4.20.27.2-1.el7ev.ppc64le.rpm vdsm-hook-checkips-4.20.27.2-1.el7ev.ppc64le.rpm vdsm-hook-extra-ipv4-addrs-4.20.27.2-1.el7ev.ppc64le.rpm vdsm-network-4.20.27.2-1.el7ev.ppc64le.rpm
x86_64: vdsm-4.20.27.2-1.el7ev.x86_64.rpm vdsm-hook-checkips-4.20.27.2-1.el7ev.x86_64.rpm vdsm-hook-extra-ipv4-addrs-4.20.27.2-1.el7ev.x86_64.rpm vdsm-network-4.20.27.2-1.el7ev.x86_64.rpm


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:1675-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1675
Issue date: 2018-05-21

Topic

An update for vdsm is now available for Red Hat Virtualization 4 for RedHat 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 Red Hat Red Hat Enterprise Linux speculative execution cache side-channel VDSM Important security fix

Relevant Releases Architectures

Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts - noarch, ppc64le, x86_64

Bugs Fixed

1566890 - CVE-2018-3639 hw: cpu: speculative store bypass

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