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Red Hat Enterprise Linux 7 RHSA-2015:1943-01 Moderate: qemu-kvm DoS Issue

red hat
Calendar Grey October 27, 2015
Dist Redhat Esm H88
Canonical has issued a notice regarding a critical LXD security patch for Ubuntu 20.04, targeting memory vulnerabilities.
Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 7

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

Summary

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the user-space component for running virtual machines using KVM.
It was found that the QEMU's websocket frame decoder processed incoming frames without limiting resources used to process the header and the payload. An attacker able to access a guest's VNC console could use this flaw to trigger a denial of service on the host by exhausting all available memory and CPU. (CVE-2015-1779)
This issue was discovered by Daniel P. Berrange of Red Hat.
All qemu-kvm users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. 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.

Topics%20covered

Topics Covered

security advisory moderate denial of service security update Red Hat Enterprise Linux KVM qemu-kvm

References

https://access.redhat.com/security/cve/CVE-2015-1779 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: qemu-kvm-1.5.3-86.el7_1.8.src.rpm
x86_64: libcacard-1.5.3-86.el7_1.8.i686.rpm libcacard-1.5.3-86.el7_1.8.x86_64.rpm qemu-img-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-common-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-debuginfo-1.5.3-86.el7_1.8.i686.rpm qemu-kvm-debuginfo-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-tools-1.5.3-86.el7_1.8.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: libcacard-devel-1.5.3-86.el7_1.8.i686.rpm libcacard-devel-1.5.3-86.el7_1.8.x86_64.rpm libcacard-tools-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-debuginfo-1.5.3-86.el7_1.8.i686.rpm qemu-kvm-debuginfo-1.5.3-86.el7_1.8.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
Source: qemu-kvm-1.5.3-86.el7_1.8.src.rpm
x86_64: libcacard-1.5.3-86.el7_1.8.i686.rpm libcacard-1.5.3-86.el7_1.8.x86_64.rpm libcacard-devel-1.5.3-86.el7_1.8.i686.rpm libcacard-devel-1.5.3-86.el7_1.8.x86_64.rpm libcacard-tools-1.5.3-86.el7_1.8.x86_64.rpm qemu-img-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-common-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-debuginfo-1.5.3-86.el7_1.8.i686.rpm qemu-kvm-debuginfo-1.5.3-86.el7_1.8.x86_64.rpm qemu-kvm-tools-1.5.3-86.el7_1.8.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):


Read the Full Advisory


Advisory ID: RHSA-2015:1943-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:1943.html
Issue date: 2015-10-27

Topic

Updated qemu-kvm packages that fix one security issue are now available forRed Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having Moderate securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory moderate denial of service security update Red Hat Enterprise Linux KVM qemu-kvm

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, x86_64

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

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

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

Bugs Fixed

1199572 - CVE-2015-1779 qemu: vnc: insufficient resource limiting in VNC websockets decoder

1273098 - qemu-kvm build failure race condition in tests/ide-test

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