Scientific Linux Security Update : kvm on SL5.x x86_64 (20120521)

medium Nessus Plugin ID 61315
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Scientific Linux kernel.

A flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled.
Calling this ioctl when at least one virtual CPU (VCPU) already existed could lead to a NULL pointer dereference later when the VCPU is scheduled to run. A malicious user in the kvm group on the host could use this flaw to crash the host. (CVE-2012-1601)

A flaw was found in the way device memory was handled during guest device removal. Upon successful device removal, memory used by the device was not properly unmapped from the corresponding IOMMU or properly released from the kernel, leading to a memory leak. A malicious user in the kvm group on the host who has the ability to assign a device to a guest could use this flaw to crash the host.
(CVE-2012-2121)

This update also fixes the following bug :

- An off-by-one error in the QEMU guest's memory management could, in rare cases, cause QEMU-KVM to crash due to a segmentation fault in tb_invalidate_phys_page_range() if a device initiated DMA into a specific guest address. In a reported case, this issue presented on a system that had a guest using the 8139cp network driver.

All users of kvm are advised to upgrade to these updated packages, which contain backported patches to correct these issues. Note that the procedure in the Solution section must be performed before this update will take effect.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?11d91fb9

Plugin Details

Severity: Medium

ID: 61315

File Name: sl_20120521_kvm_on_SL5_x.nasl

Version: 1.5

Type: local

Agent: unix

Published: 8/1/2012

Updated: 1/14/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 4

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Vulnerability Information

CPE: p-cpe:/a:fermilab:scientific_linux:kmod-kvm, p-cpe:/a:fermilab:scientific_linux:kmod-kvm-debug, p-cpe:/a:fermilab:scientific_linux:kvm, p-cpe:/a:fermilab:scientific_linux:kvm-debuginfo, p-cpe:/a:fermilab:scientific_linux:kvm-qemu-img, p-cpe:/a:fermilab:scientific_linux:kvm-tools, x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 5/21/2012

Vulnerability Publication Date: 5/17/2012

Reference Information

CVE: CVE-2012-1601, CVE-2012-2121