Executive Summary
Summary | |
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Title | kvm security and bug fix update |
Informations | |||
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Name | RHSA-2009:1659 | First vendor Publication | 2009-12-09 |
Vendor | RedHat | Last vendor Modification | 2009-12-09 |
Severity (Vendor) | Moderate | Revision | 01 |
Security-Database Scoring CVSS v3
Cvss vector : N/A | |||
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Overall CVSS Score | NA | ||
Base Score | NA | Environmental Score | NA |
impact SubScore | NA | Temporal Score | NA |
Exploitabality Sub Score | NA | ||
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:C) | |||
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Cvss Base Score | 7.8 | Attack Range | Network |
Cvss Impact Score | 6.9 | Attack Complexity | Low |
Cvss Expoit Score | 10 | Authentication | None Required |
Calculate full CVSS 2.0 Vectors scores |
Detail
Problem Description: Updated kvm packages that fix one security issue and several bugs are now available for Red Hat Enterprise Linux 5. This update has been rated as having moderate security impact by the Red Hat Security Response Team. 2. Relevant releases/architectures: RHEL Desktop Multi OS (v. 5 client) - x86_64 RHEL Virtualization (v. 5 server) - x86_64 3. 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 Red Hat Enterprise Linux kernel. On x86 platforms, the do_insn_fetch() function did not limit the amount of instruction bytes fetched per instruction. Users in guest operating systems could leverage this flaw to cause large latencies on SMP hosts that could lead to a local denial of service on the host operating system. This update fixes this issue by imposing the architecturally-defined 15 byte length limit for instructions. (CVE-2009-4031) This update also fixes the following bugs: * performance problems occurred when using the qcow2 image format with the qemu-kvm -drive "cache=none" option (the default setting when not specified otherwise). This could cause guest operating system installations to take hours. With this update, performance patches have been backported so that using the qcow2 image format with the "cache=none" option no longer causes performance issues. (BZ#520693) * when using the virtual vm8086 mode, bugs in the emulated hardware task switching implementation may have, in some situations, caused older guest operating systems to malfunction. (BZ#532031) * Windows Server 2003 guests (32-bit) with more than 4GB of memory may have crashed during reboot when using the default qemu-kvm CPU settings. (BZ#532043) * with Red Hat Enterprise Virtualization, guests continued to run after encountering disk read errors. This could have led to their file systems becoming corrupted (but not the host's), notably in environments that use networked storage. With this update, the qemu-kvm -drive "werror=stop" option now applies not only to write errors but also to read errors: When using this option, guests will pause on disk read and write errors. By default, guests managed by Red Hat Enterprise Virtualization use the "werror=stop" option. This option is not used by default for guests managed by libvirt. (BZ#537334, BZ#540406) * the para-virtualized block driver (virtio-blk) silently ignored read errors when accessing disk images. With this update, the driver correctly signals the read error to the guest. (BZ#537334) 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. 4. Solution: Before applying this update, make sure that all previously-released errata relevant to your system have been applied. This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at http://kbase.redhat.com/faq/docs/DOC-11259 The following procedure must be performed before this update will take effect: 1) Stop all KVM guest virtual machines. 2) Either reboot the hypervisor machine or, as the root user, remove (using "modprobe -r [module]") and reload (using "modprobe [module]") all of the following modules which are currently running (determined using "lsmod"): kvm, ksm, kvm-intel or kvm-amd. 3) Restart the KVM guest virtual machines. 5. Bugs fixed (http://bugzilla.redhat.com/): 532031 - KVM does not implement proper support for hardware task linking when using vm8086 mode 532043 - qemu aborted when restart 32bitwin23k with more than 4G mem in intel host. 537334 - O/S Filesystem Corruption with RHEL-5.4 on a RHEV Guest 540406 - RHEL5.4 VM image corruption with an IDE v-disk 541160 - CVE-2009-4031 kernel: KVM: x86 emulator: limit instructions to 15 bytes |
Original Source
Url : https://rhn.redhat.com/errata/RHSA-2009-1659.html |
CWE : Common Weakness Enumeration
% | Id | Name |
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100 % | CWE-20 | Improper Input Validation |
OVAL Definitions
Definition Id: oval:org.mitre.oval:def:11089 | |||
Oval ID: | oval:org.mitre.oval:def:11089 | ||
Title: | The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service (increased scheduling latency) on the host OS via unspecified manipulations related to SMP support. | ||
Description: | The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service (increased scheduling latency) on the host OS via unspecified manipulations related to SMP support. | ||
Family: | unix | Class: | vulnerability |
Reference(s): | CVE-2009-4031 | Version: | 5 |
Platform(s): | Red Hat Enterprise Linux 5 CentOS Linux 5 Oracle Linux 5 | Product(s): | |
Definition Synopsis: | |||
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Definition Id: oval:org.mitre.oval:def:18428 | |||
Oval ID: | oval:org.mitre.oval:def:18428 | ||
Title: | DSA-1962-1 kvm - several vulnerabilities | ||
Description: | Several vulnerabilities have been discovered in kvm, a full virtualization system. | ||
Family: | unix | Class: | patch |
Reference(s): | DSA-1962-1 CVE-2009-3638 CVE-2009-3722 CVE-2009-4031 | Version: | 7 |
Platform(s): | Debian GNU/Linux 5.0 | Product(s): | kvm |
Definition Synopsis: | |||
Definition Id: oval:org.mitre.oval:def:22916 | |||
Oval ID: | oval:org.mitre.oval:def:22916 | ||
Title: | ELSA-2009:1659: kvm security and bug fix update (Moderate) | ||
Description: | The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service (increased scheduling latency) on the host OS via unspecified manipulations related to SMP support. | ||
Family: | unix | Class: | patch |
Reference(s): | ELSA-2009:1659-01 CVE-2009-4031 | Version: | 6 |
Platform(s): | Oracle Linux 5 | Product(s): | kvm |
Definition Synopsis: | |||
Definition Id: oval:org.mitre.oval:def:6977 | |||
Oval ID: | oval:org.mitre.oval:def:6977 | ||
Title: | DSA-1962 kvm -- several vulnerabilities | ||
Description: | Several vulnerabilities have been discovered in kvm, a full virtualization system. The Common Vulnerabilities and Exposures project identifies the following problems: It was discovered an Integer overflow in the kvm_dev_ioctl_get_supported_cpuid function. This allows local users to have an unspecified impact via a KVM_GET_SUPPORTED_CPUID request to the kvm_arch_dev_ioctl function. It was discovered that the handle_dr function in the KVM subsystem does not properly verify the Current Privilege Level before accessing a debug register, which allows guest OS users to cause a denial of service on the host OS via a crafted application. It was discovered that the do_insn_fetch function in the x86 emulator in the KVM subsystem tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service on the host OS via unspecified manipulations related to SMP support. | ||
Family: | unix | Class: | patch |
Reference(s): | DSA-1962 CVE-2009-3638 CVE-2009-3722 CVE-2009-4031 | Version: | 5 |
Platform(s): | Debian GNU/Linux 5.0 | Product(s): | kvm |
Definition Synopsis: | |||
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CPE : Common Platform Enumeration
OpenVAS Exploits
Date | Description |
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2010-02-08 | Name : Ubuntu Update for Linux kernel vulnerabilities USN-894-1 File : nvt/gb_ubuntu_USN_894_1.nasl |
2009-12-30 | Name : CentOS Security Advisory CESA-2009:1659 (kvm) File : nvt/ovcesa2009_1659.nasl |
2009-12-14 | Name : RedHat Security Advisory RHSA-2009:1659 File : nvt/RHSA_2009_1659.nasl |
2009-12-14 | Name : Fedora Core 10 FEDORA-2009-13098 (kernel) File : nvt/fcore_2009_13098.nasl |
Open Source Vulnerability Database (OSVDB)
Id | Description |
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60559 | Linux Kernel KVM Subsystem x86 Emulator arch/x86/kvm/emulate.c do_insn_fetch ... |
Nessus® Vulnerability Scanner
Date | Description |
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2013-07-12 | Name : The remote Oracle Linux host is missing one or more security updates. File : oraclelinux_ELSA-2009-1659.nasl - Type : ACT_GATHER_INFO |
2013-07-12 | Name : The remote Oracle Linux host is missing one or more security updates. File : oraclelinux_ELSA-2010-0126.nasl - Type : ACT_GATHER_INFO |
2013-01-24 | Name : The remote Red Hat host is missing one or more security updates. File : redhat-RHSA-2009-1659.nasl - Type : ACT_GATHER_INFO |
2013-01-24 | Name : The remote Red Hat host is missing one or more security updates. File : redhat-RHSA-2010-0126.nasl - Type : ACT_GATHER_INFO |
2012-08-01 | Name : The remote Scientific Linux host is missing one or more security updates. File : sl_20091209_kvm_on_SL5_4.nasl - Type : ACT_GATHER_INFO |
2010-03-23 | Name : The remote openSUSE host is missing a security update. File : suse_11_2_kernel-100317.nasl - Type : ACT_GATHER_INFO |
2010-03-04 | Name : The remote CentOS host is missing one or more security updates. File : centos_RHSA-2010-0126.nasl - Type : ACT_GATHER_INFO |
2010-02-24 | Name : The remote Debian host is missing a security-related update. File : debian_DSA-1962.nasl - Type : ACT_GATHER_INFO |
2010-02-05 | Name : The remote Ubuntu host is missing one or more security-related patches. File : ubuntu_USN-894-1.nasl - Type : ACT_GATHER_INFO |
2010-01-06 | Name : The remote CentOS host is missing one or more security updates. File : centos_RHSA-2009-1659.nasl - Type : ACT_GATHER_INFO |
2009-12-14 | Name : The remote Fedora host is missing a security update. File : fedora_2009-13098.nasl - Type : ACT_GATHER_INFO |
Alert History
Date | Informations |
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2014-02-17 11:53:07 |
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