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CentOS 5 : kvm (CESA-2010:0126)
high Nessus Plugin ID 44969
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Synopsis
The remote CentOS host is missing one or more security updates.Description
Updated kvm packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 5.This update has been rated as having important security impact by the Red Hat Security Response Team.
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 Red Hat Enterprise Linux kernel.
A flaw was found in the way the x86 emulator loaded segment selectors (used for memory segmentation and protection) into segment registers.
In some guest system configurations, an unprivileged guest user could leverage this flaw to crash the guest or possibly escalate their privileges within the guest. (CVE-2010-0419)
The x86 emulator implementation was missing a check for the Current Privilege Level (CPL) while accessing debug registers. An unprivileged user in a guest could leverage this flaw to crash the guest.
(CVE-2009-3722)
This update also fixes the following bugs :
With Red Hat Enterprise Virtualization, the virtio_blk_dma_restart_bh() function was previously used to handle write errors; however, a bug fix provided by the RHSA-2009:1659 update meant that read errors would also have to be handled by this function.
The function was not updated for this, causing read errors to be resubmitted as writes. This caused guest image corruption in some cases.
Additionally, the return values of the bdrv_aio_write() and bdrv_aio_read() functions were ignored. If an immediate failure occurred in one of these functions, errors would be missed and the guest could hang or read corrupted data. (BZ#562776)
All KVM users should upgrade to these updated packages, which contain backported patches to resolve these issues. Note: The procedure in the Solution section must be performed before this update will take effect.
Solution
Update the affected kvm packages.See Also
Plugin Details
Severity: High
ID: 44969
File Name: centos_RHSA-2010-0126.nasl
Version: 1.16
Type: local
Agent: unix
Family: CentOS Local Security Checks
Published: 3/4/2010
Updated: 1/4/2021
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.5
CVSS v2
Risk Factor: High
Base Score: 7.1
Temporal Score: 5.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C
Vulnerability Information
CPE: p-cpe:/a:centos:centos:kmod-kvm, p-cpe:/a:centos:centos:kvm-tools, cpe:/o:centos:centos:5, p-cpe:/a:centos:centos:kvm-qemu-img, p-cpe:/a:centos:centos:kvm
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 3/2/2010
Vulnerability Publication Date: 10/30/2009
Reference Information
CVE: CVE-2009-3722, CVE-2010-0419
BID: 37221