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Red Hat: RHSA-2016-1606 Moderate: qemu-kvm DoS and Overflow Issues

red hat
Calendar Grey August 11, 2016
Dist Redhat Esm H88
Canonical has released a critical patch for libvirt, rectifying significant security flaws. Discover the best practices for implementing this update.
An update for qemu-kvm is now available 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

After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Summary

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm packages provide the user-space component for running virtual machines using KVM.
Security Fix(es):
* Quick Emulator(Qemu) built with the Block driver for iSCSI images support (virtio-blk) is vulnerable to a heap buffer overflow issue. It could occur while processing iSCSI asynchronous I/O ioctl(2) calls. A user inside guest could use this flaw to crash the Qemu process resulting in DoS or potentially leverage it to execute arbitrary code with privileges of the Qemu process on the host. (CVE-2016-5126)
* Quick emulator(Qemu) built with the virtio framework is vulnerable to an unbounded memory allocation issue. It was found that a malicious guest user could submit more requests than the virtqueue size permits. Processing a request allocates a VirtQueueElement and therefore causes unbounded memory allocation on the host controlled by the guest. (CVE-2016-5403)
Red Hat would like to thank hongzhenhao (Marvel Team) for reporting CVE-2016-5403.

Topics%20covered

Topics Covered

security advisory moderate update DoS Red Hat Enterprise Linux qemu-kvm overflow issue

References

https://access.redhat.com/security/cve/CVE-2016-5126 https://access.redhat.com/security/cve/CVE-2016-5403 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: qemu-kvm-1.5.3-105.el7_2.7.src.rpm
x86_64: libcacard-1.5.3-105.el7_2.7.i686.rpm libcacard-1.5.3-105.el7_2.7.x86_64.rpm qemu-img-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-common-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-debuginfo-1.5.3-105.el7_2.7.i686.rpm qemu-kvm-debuginfo-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-tools-1.5.3-105.el7_2.7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: libcacard-devel-1.5.3-105.el7_2.7.i686.rpm libcacard-devel-1.5.3-105.el7_2.7.x86_64.rpm libcacard-tools-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-debuginfo-1.5.3-105.el7_2.7.i686.rpm qemu-kvm-debuginfo-1.5.3-105.el7_2.7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
Source: qemu-kvm-1.5.3-105.el7_2.7.src.rpm
x86_64: libcacard-1.5.3-105.el7_2.7.i686.rpm libcacard-1.5.3-105.el7_2.7.x86_64.rpm libcacard-devel-1.5.3-105.el7_2.7.i686.rpm libcacard-devel-1.5.3-105.el7_2.7.x86_64.rpm libcacard-tools-1.5.3-105.el7_2.7.x86_64.rpm qemu-img-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-common-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-debuginfo-1.5.3-105.el7_2.7.i686.rpm qemu-kvm-debuginfo-1.5.3-105.el7_2.7.x86_64.rpm qemu-kvm-tools-1.5.3-105.el7_2.7.x86_64.rpm


Read the Full Advisory


Advisory ID: RHSA-2016:1606-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1606.html
Issue date: 2016-08-11

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate update DoS Red Hat Enterprise Linux qemu-kvm overflow issue

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

1340924 - CVE-2016-5126 Qemu: block: iscsi: buffer overflow in iscsi_aio_ioctl

1358359 - CVE-2016-5403 Qemu: virtio: unbounded memory allocation on host via guest leading to DoS

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