CVE-2011-4347 Missing authorization in n/a

Medium 4.0 Published 8 Jun 2013 Updated 7 Aug 2024

Local users can crash the host OS by assigning PCI devices without proper permission checks in the KVM subsystem.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2011-4347?

CVE-2011-4347 is a medium-severity missing authorization vulnerability in Linux kernel, published on 8 Jun 2013. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The kvm_vm_ioctl_assign_device function in virt/kvm/assigned-dev.c in the KVM subsystem in the Linux kernel before 3.1.10 does not verify permission to access PCI configuration space and BAR resources, which allows host OS users to assign PCI devices and cause a denial of service (host OS crash) via a KVM_ASSIGN_PCI_DEVICE operation.

Weakness: CWE-264

Which versions are affected by CVE-2011-4347?

It affects 1 product.

Linux distribution packages (12)

`kmod-kvm` Red Hat:rhel_virtualization:5::client	All versions	`0:83-249.el5`
`kmod-kvm-debug` Red Hat:rhel_virtualization:5::client	All versions	`0:83-249.el5`
`kvm` Red Hat:rhel_virtualization:5::client	All versions	`0:83-249.el5`
`kvm-debuginfo` Red Hat:rhel_virtualization:5::client	All versions	`0:83-249.el5`
`kvm-qemu-img` Red Hat:rhel_virtualization:5::client	All versions	`0:83-249.el5`
`kvm-tools` Red Hat:rhel_virtualization:5::client	All versions	`0:83-249.el5`
`kmod-kvm` Red Hat:rhel_virtualization:5::server	All versions	`0:83-249.el5`
`kmod-kvm-debug` Red Hat:rhel_virtualization:5::server	All versions	`0:83-249.el5`
`kvm` Red Hat:rhel_virtualization:5::server	All versions	`0:83-249.el5`
`kvm-debuginfo` Red Hat:rhel_virtualization:5::server	All versions	`0:83-249.el5`
`kvm-qemu-img` Red Hat:rhel_virtualization:5::server	All versions	`0:83-249.el5`
`kvm-tools` Red Hat:rhel_virtualization:5::server	All versions	`0:83-249.el5`

Products include Linux kernel.

How do I fix CVE-2011-4347?

Apply the vendor's patch.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2011-4347 being exploited?

There is no known exploitation of CVE-2011-4347 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as GHSA-x4h8-vxmx-gj2j, RHSA-2012:0149.