National Cyber-Alert System
Vulnerability Summary for CVE-2009-3722
Original release date:10/30/2009
Last revised:11/09/2009
Source:
US-CERT/NIST
Overview
The handle_dr function in arch/x86/kvm/vmx.c in the KVM subsystem in the Linux kernel before 2.6.31.1 does not properly verify the Current Privilege Level (CPL) before accessing a debug register, which allows guest OS users to cause a denial of service (trap) on the host OS via a crafted application.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
6.9
Exploitability Subscore:
8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type:Allows disruption of serviceUnknown
Official Statement from Red Hat (11/02/2009)
Not vulnerable. This issue did not affect the version of KVM (Kernel-based Virtual Machine) as shipped with Red Hat Enterprise Linux 5. The flaw was introduced in kernel version 2.6.30-rc1. The KVM package as shipped with Red Hat Enterprise Linux 5 does not include this upstream change, and therefore is not affected by this issue.
References to Advisories, Solutions, and Tools
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External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=531660
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc1
Type: Advisory
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31.1
Type: Advisory
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.9
Type: Advisory
External Source: MLIST
Name: [oss-security] 20091029 Re: CVE request: kvm: check cpl before emulating debug register access
External Source: MLIST
Name: [oss-security] 20091029 CVE request: kvm: check cpl before emulating debug register access
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0a79b009525b160081d75cef5dbf45817956acf2
