medium
4
CWE
264
Advisory Published
CVE Published
Updated

CVE-2011-4347

First published: Tue Nov 22 2011(Updated: )

It was found that kvm_vm_ioctl_assign_device function did not check if the user requesting assignment was privileged or not. Together with /dev/kvm being 666, unprivileged user could assign unused pci devices, or even devices that were in use and whose resources were not properly claimed by the respective drivers. Please note that privileged access was still needed to re-program the device to for example issue DMA requests. This is typically achieved by touching files on sysfs filesystem. These files are usually not accessible to unprivileged users. As a result, local user could use this flaw to crash the system. Reference: <a href="http://thread.gmane.org/gmane.comp.emulators.kvm.devel/82043">http://thread.gmane.org/gmane.comp.emulators.kvm.devel/82043</a> Acknowledgements: Red Hat would like to thank Sasha Levin for reporting this issue.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux kernel=3.1.2
Linux kernel=3.1.6
Linux kernel=3.1.3
Linux kernel=3.1.5
Linux kernel=3.1.8
Linux kernel=3.1.7
Linux kernel=3.1.1
Linux kernel=3.1.4
Linux kernel<=3.1.9
debian/linux-2.6
Linux Kernel<=3.1.9
Linux Kernel=3.1.1
Linux Kernel=3.1.2
Linux Kernel=3.1.3
Linux Kernel=3.1.4
Linux Kernel=3.1.5
Linux Kernel=3.1.6
Linux Kernel=3.1.7
Linux Kernel=3.1.8

Remedy

https://git.kernel.org/linus/4d5c5d0fe89c921336b95f5e7e4f529a9df92f53

Remedy

https://git.kernel.org/linus/3d27e23b17010c668db311140b17bbbb70c78fb9

Remedy

https://git.kernel.org/linus/423873736b78f549fbfa2f715f2e4de7e6c5e1e9

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2011-4347?

    CVE-2011-4347 is considered to have a high severity due to potential privilege escalation risks.

  • How do I fix CVE-2011-4347?

    To fix CVE-2011-4347, update to a patched version of the Linux kernel that addresses this vulnerability.

  • Which versions of the Linux kernel are affected by CVE-2011-4347?

    CVE-2011-4347 affects Linux kernel versions up to 3.1.9, including specific versions like 3.1.1 to 3.1.8.

  • What vulnerability type is CVE-2011-4347?

    CVE-2011-4347 describes a privilege escalation vulnerability related to device assignment in KVM.

  • Who can be impacted by CVE-2011-4347?

    CVE-2011-4347 can impact unprivileged users who can potentially assign PCI devices improperly through the KVM interface.

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