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Red Hat: RHSA-2015:1189-01 Important: KVM Buffer Overflow Security Advisory

red hat
Calendar Grey June 25, 2015
Dist Redhat Esm H88
Debian's Essential qemu security patch: DSA-2022:952-1 for Debian GNU/Linux 10, resolving severe vulnerabilities.
Updated kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 5

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.

Summary

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems.
A flaw was found in the way QEMU's AMD PCnet Ethernet emulation handled multi-TMD packets with a length above 4096 bytes. A privileged guest user in a guest with an AMD PCNet ethernet card enabled could potentially use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process. (CVE-2015-3209)
Red Hat would like to thank Matt Tait of Google's Project Zero security team 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.

Topics%20covered

Topics Covered

security advisory Red Hat buffer overflow security fix kvm

References

https://access.redhat.com/security/cve/CVE-2015-3209 https://access.redhat.com/security/updates/classification/#important

Package List

RHEL Desktop Multi OS (v. 5 client):
Source: kvm-83-273.el5_11.src.rpm
x86_64: kmod-kvm-83-273.el5_11.x86_64.rpm kmod-kvm-debug-83-273.el5_11.x86_64.rpm kvm-83-273.el5_11.x86_64.rpm kvm-debuginfo-83-273.el5_11.x86_64.rpm kvm-qemu-img-83-273.el5_11.x86_64.rpm kvm-tools-83-273.el5_11.x86_64.rpm
RHEL Virtualization (v. 5 server):
Source: kvm-83-273.el5_11.src.rpm
x86_64: kmod-kvm-83-273.el5_11.x86_64.rpm kmod-kvm-debug-83-273.el5_11.x86_64.rpm kvm-83-273.el5_11.x86_64.rpm kvm-debuginfo-83-273.el5_11.x86_64.rpm kvm-qemu-img-83-273.el5_11.x86_64.rpm kvm-tools-83-273.el5_11.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2015:1189-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:1189.html
Issue date: 2015-06-25

Topic

Updated kvm packages that fix one security issue are now available for RedHat Enterprise Linux 5.Red Hat Product Security has rated this update as having Important 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 Red Hat buffer overflow security fix kvm

Relevant Releases Architectures

RHEL Desktop Multi OS (v. 5 client) - x86_64

RHEL Virtualization (v. 5 server) - x86_64

Bugs Fixed

1225882 - CVE-2015-3209 qemu: pcnet: multi-tmd buffer overflow in the tx path

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