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Red Hat Product Errata RHSA-2015:1003 - Security Advisory
Issued:
2015-05-13
Updated:
2015-05-13

RHSA-2015:1003 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: kvm security update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

Updated kvm packages that fix one security issue are now available for Red
Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems.

An out-of-bounds memory access flaw was found in the way QEMU's virtual
Floppy Disk Controller (FDC) handled FIFO buffer access while processing
certain FDC commands. A privileged guest user could use this flaw to crash
the guest or, potentially, execute arbitrary code on the host with the
privileges of the host's QEMU process corresponding to the guest.
(CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting
this issue.

All kvm users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. Note: The procedure in
the Solution section must be performed before this update will take effect.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

The following procedure must be performed before this update will take
effect:

1) Stop all KVM guest virtual machines.

2) Either reboot the hypervisor machine or, as the root user, remove (using
"modprobe -r [module]") and reload (using "modprobe [module]") all of the
following modules which are currently running (determined using "lsmod"):
kvm, ksm, kvm-intel or kvm-amd.

3) Restart the KVM guest virtual machines.

Affected Products

  • Red Hat Enterprise Linux Server 5 x86_64
  • Red Hat Enterprise Linux Workstation 5 x86_64

Fixes

  • BZ - 1218611 - CVE-2015-3456 qemu: fdc: out-of-bounds fifo buffer memory access

CVEs

  • CVE-2015-3456

References

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

Red Hat Enterprise Linux Server 5

SRPM
kvm-83-272.el5_11.src.rpm SHA-256: 7d2060f8ce705ff01b3096089b6fce535d240db5c605b0d8dcd5f4648d0a4880
x86_64
kmod-kvm-83-272.el5_11.x86_64.rpm SHA-256: 0dc773aaa5438283c196ec9b8d7cb3fab41e0f3b594ccad1c8849989019679dc
kmod-kvm-debug-83-272.el5_11.x86_64.rpm SHA-256: 252a04502ad2603cb61ec931cd7fcab6d73de672aa7c830d8203d9b225bf0dad
kvm-83-272.el5_11.x86_64.rpm SHA-256: 5fe798515ac14327b6b24e7695676d5df6771342cd4844ae62351aaab30f67b7
kvm-debuginfo-83-272.el5_11.x86_64.rpm SHA-256: 9d218bc32afc39757299606106f93ca3fc3e62cb4c1ad5f15c32ddca55e2ebbd
kvm-qemu-img-83-272.el5_11.x86_64.rpm SHA-256: d187548d17171c036f2fadcdc91b474cc0a97c5fcb030937700dbeb037e2f829
kvm-tools-83-272.el5_11.x86_64.rpm SHA-256: dec6eedf57bd0d5f489e7cf8e2d8ab56e22b84f5eb20f9f2606856990580814c

Red Hat Enterprise Linux Workstation 5

SRPM
kvm-83-272.el5_11.src.rpm SHA-256: 7d2060f8ce705ff01b3096089b6fce535d240db5c605b0d8dcd5f4648d0a4880
x86_64
kmod-kvm-83-272.el5_11.x86_64.rpm SHA-256: 0dc773aaa5438283c196ec9b8d7cb3fab41e0f3b594ccad1c8849989019679dc
kmod-kvm-debug-83-272.el5_11.x86_64.rpm SHA-256: 252a04502ad2603cb61ec931cd7fcab6d73de672aa7c830d8203d9b225bf0dad
kvm-83-272.el5_11.x86_64.rpm SHA-256: 5fe798515ac14327b6b24e7695676d5df6771342cd4844ae62351aaab30f67b7
kvm-debuginfo-83-272.el5_11.x86_64.rpm SHA-256: 9d218bc32afc39757299606106f93ca3fc3e62cb4c1ad5f15c32ddca55e2ebbd
kvm-qemu-img-83-272.el5_11.x86_64.rpm SHA-256: d187548d17171c036f2fadcdc91b474cc0a97c5fcb030937700dbeb037e2f829
kvm-tools-83-272.el5_11.x86_64.rpm SHA-256: dec6eedf57bd0d5f489e7cf8e2d8ab56e22b84f5eb20f9f2606856990580814c

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

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