CentOS Update for kmod-kvm CESA-2013:0727 centos5

Published: 2013-04-15 04:42:35
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:A/AC:H/Au:N/C:C/I:C/A:C

Summary:
The remote host is missing an update for the 'kmod-kvm' Linux Distribution Package(s) announced via the referenced advisory.

Affected Versions:
kmod-kvm on CentOS 5

Recommendations:
Please install the updated Linux Distribution Packages.

Technical Details:
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 KVM handled guest time updates when the buffer the guest registered by writing to the MSR_KVM_SYSTEM_TIME machine state register (MSR) crossed a page boundary. A privileged guest user could use this flaw to crash the host or, potentially, escalate their privileges, allowing them to execute arbitrary code at the host kernel level. (CVE-2013-1796) A potential use-after-free flaw was found in the way KVM handled guest time updates when the GPA (guest physical address) the guest registered by writing to the MSR_KVM_SYSTEM_TIME machine state register (MSR) fell into a movable or removable memory region of the hosting user-space process (by default, QEMU-KVM) on the host. If that memory region is deregistered from KVM using KVM_SET_USER_MEMORY_REGION and the allocated virtual memory reused, a privileged guest user could potentially use this flaw to escalate their privileges on the host. (CVE-2013-1797) A flaw was found in the way KVM emulated IOAPIC (I/O Advanced Programmable Interrupt Controller). A missing validation check in the ioapic_read_indirect() function could allow a privileged guest user to crash the host, or read a substantial portion of host kernel memory. (CVE-2013-1798) Red Hat would like to thank Andrew Honig of Google for reporting all of these issues. All users of kvm are advised to upgrade to these updated Linux Distribution 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.

Detection Type:
Linux Distribution Package

Solution Type:
Vendor Patch

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2013-1796
https://nvd.nist.gov/vuln/detail/CVE-2013-1797
https://nvd.nist.gov/vuln/detail/CVE-2013-1798

References:

http://lists.centos.org/pipermail/centos-announce/2013-April/019683.html

Severity
Medium
CVSS Score
6.8
Published
2013-04-15
Modified
2019-03-15
Category
CentOS Local Security Checks

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