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Red Hat: RHSA-2011:1781-01 Critical: qemu-kvm Heap Overflow Threat

red hat
Calendar Grey December 6, 2011
Dist Redhat Esm H88
Critical qemu-kvm security bulletin for Red Hat 6 mitigates potential vulnerabilities leading to system crashes and privilege elevation risks.
Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 6

Solution

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

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259

Summary

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component for running virtual machines using KVM.
A flaw was found in the way qemu-kvm handled VSC_ATR messages when a guest was configured for a CCID (Chip/Smart Card Interface Devices) USB smart card reader in passthrough mode. An attacker able to connect to the port on the host being used for such a device could use this flaw to crash the qemu-kvm process on the host or, possibly, escalate their privileges on the host. (CVE-2011-4111)
All users of qemu-kvm should upgrade to these updated packages, which contain a backported patch to resolve 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 critical issue Red Hat buffer overflow privilege escalation Linux update qemu-kvm

References

https://access.redhat.com/security/cve/CVE-2011-4111 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.209.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.209.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.209.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.1.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.209.el6_2.1.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/#package


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2011:1777-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:1777.html
Issue date: 2011-12-06

Topic

Updated qemu-kvm packages that fix one security issue are now available forRed Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as havingimportant security impact. A Common Vulnerability Scoring System (CVSS)base score, which gives a detailed severity rating, is available from theCVE link in the References section.

Topics%20covered

Topics Covered

security advisory critical issue Red Hat buffer overflow privilege escalation Linux update qemu-kvm

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - x86_64

Red Hat Enterprise Linux Workstation (v. 6) - x86_64

Bugs Fixed

751310 - CVE-2011-4111 qemu: ccid: buffer overflow in handling of VSC_ATR message

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