rhsa-2010_0998
Vulnerability from csaf_redhat
Published
2010-12-20 17:35
Modified
2024-11-22 04:24
Summary
Red Hat Security Advisory: kvm security and bug fix update

Notes

Topic
Updated kvm packages that fix one security issue and three bugs are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having low security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
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. It was found that some structure padding and reserved fields in certain data structures in QEMU-KVM were not initialized properly before being copied to user-space. A privileged host user with access to "/dev/kvm" could use this flaw to leak kernel stack memory to user-space. (CVE-2010-3881) Red Hat would like to thank Vasiliy Kulikov for reporting this issue. This update also fixes the following bugs: * The 'kvm_amd' kernel module did not initialize the TSC (Time Stamp Counter) offset in the VMCB (Virtual Machine Control Block) correctly. After a vCPU (virtual CPU) has been created, the TSC offset in the VMCB should have a negative value so that the virtual machine will see TSC values starting at zero. However, the TSC offset was set to zero and therefore the virtual machine saw the same TSC value as the host. With this update, the TSC offset has been updated to show the correct values. (BZ#656984) * Setting the boot settings of a virtual machine to, firstly, boot from PXE and, secondly, to boot from the hard drive would result in a PXE boot loop, that is, the virtual machine would not continue to boot from the hard drive if the PXE boot failed. This was caused by a flaw in the 'bochs-bios' (part of KVM) code. With this update, after a virtual machine tries to boot from PXE and fails, it continues to boot from a hard drive if there is one present. (BZ#659850) * If a 64-bit Red Hat Enterprise Linux 5.5 virtual machine was migrated to another host with a different CPU clock speed, the clock of that virtual machine would consistently lose or gain time (approximately half a second for every second the host is running). On machines that do not use the kvm clock, the network time protocol daemon (ntpd) could correct the time drifts caused by migration. However, using the pvclock caused the time to change consistently. This was due to flaws in the save/load functions of pvclock. With this update, the issue has been fixed and migrating a virtual machine no longer causes time drift. (BZ#660239) All KVM users should upgrade to these updated packages, which contain backported patches to correct these issues. Note: The procedure in the Solution section must be performed before this update will take effect.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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        "category": "summary",
        "text": "Updated kvm packages that fix one security issue and three bugs are now\navailable for Red Hat Enterprise Linux 5.\n\nThe Red Hat Security Response Team has rated this update as having low\nsecurity impact. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available from the CVE link in\nthe References section.",
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        "text": "KVM (Kernel-based Virtual Machine) is a full virtualization solution for\nLinux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for\nthe standard Red Hat Enterprise Linux kernel.\n\nIt was found that some structure padding and reserved fields in certain\ndata structures in QEMU-KVM were not initialized properly before being\ncopied to user-space. A privileged host user with access to \"/dev/kvm\"\ncould use this flaw to leak kernel stack memory to user-space.\n(CVE-2010-3881)\n\nRed Hat would like to thank Vasiliy Kulikov for reporting this issue.\n\nThis update also fixes the following bugs:\n\n* The \u0027kvm_amd\u0027 kernel module did not initialize the TSC (Time Stamp\nCounter) offset in the VMCB (Virtual Machine Control Block) correctly.\nAfter a vCPU (virtual CPU) has been created, the TSC offset in the VMCB\nshould have a negative value so that the virtual machine will see TSC\nvalues starting at zero. However, the TSC offset was set to zero and\ntherefore the virtual machine saw the same TSC value as the host. With this\nupdate, the TSC offset has been updated to show the correct values.\n(BZ#656984)\n\n* Setting the boot settings of a virtual machine to, firstly, boot from PXE\nand, secondly, to boot from the hard drive would result in a PXE boot loop,\nthat is, the virtual machine would not continue to boot from the hard drive\nif the PXE boot failed. This was caused by a flaw in the \u0027bochs-bios\u0027 (part\nof KVM) code. With this update, after a virtual machine tries to boot from\nPXE and fails, it continues to boot from a hard drive if there is one\npresent. (BZ#659850)\n\n* If a 64-bit Red Hat Enterprise Linux 5.5 virtual machine was migrated to\nanother host with a different CPU clock speed, the clock of that virtual\nmachine would consistently lose or gain time (approximately half a second\nfor every second the host is running). On machines that do not use the kvm\nclock, the network time protocol daemon (ntpd) could correct the time\ndrifts caused by migration. However, using the pvclock caused the time to\nchange consistently. This was due to flaws in the save/load functions of\npvclock. With this update, the issue has been fixed and migrating a virtual\nmachine no longer causes time drift. (BZ#660239)\n\nAll KVM users should upgrade to these updated packages, which contain\nbackported patches to correct these issues. Note: The procedure in the\nSolution section must be performed before this update will take effect.",
        "title": "Details"
      },
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Vasiliy Kulikov"
          ],
          "organization": "Openwall"
        }
      ],
      "cve": "CVE-2010-3881",
      "discovery_date": "2010-10-30T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "649920"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "arch/x86/kvm/x86.c in the Linux kernel before 2.6.36.2 does not initialize certain structure members, which allows local users to obtain potentially sensitive information from kernel stack memory via read operations on the /dev/kvm device.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kvm: arch/x86/kvm/x86.c: reading uninitialized stack memory",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did not affect the version of Linux kernel as shipped with Red Hat\nEnterprise Linux 3, 4 and Red Hat Enterprise MRG as they did not include\nsupport for Kernel-based Virtual Machine (KVM). A future kernel update in Red\nHat Enterprise Linux 5 may address this flaw.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "5Server-VT:kvm-tools-0:83-164.el5_5.30.x86_64"
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2010-3881"
        },
        {
          "category": "external",
          "summary": "RHBZ#649920",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=649920"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2010-3881",
          "url": "https://www.cve.org/CVERecord?id=CVE-2010-3881"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2010-3881",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-3881"
        }
      ],
      "release_date": "2010-10-30T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2010-12-20T17:35:00+00:00",
          "details": "Before applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttp://kbase.redhat.com/faq/docs/DOC-11259\n\nThe following procedure must be performed before this update will take\neffect:\n\n1) Stop all KVM guest virtual machines.\n\n2) Either reboot the hypervisor machine or, as the root user, remove (using\n\"modprobe -r [module]\") and reload (using \"modprobe [module]\") all of the\nfollowing modules which are currently running (determined using \"lsmod\"):\nkvm, ksm, kvm-intel or kvm-amd.\n\n3) Restart the KVM guest virtual machines.",
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            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2010:0998"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 1.9,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:M/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "products": [
            "5Client-VT:kmod-kvm-0:83-164.el5_5.30.x86_64",
            "5Client-VT:kvm-0:83-164.el5_5.30.src",
            "5Client-VT:kvm-0:83-164.el5_5.30.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-164.el5_5.30.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-164.el5_5.30.x86_64",
            "5Client-VT:kvm-tools-0:83-164.el5_5.30.x86_64",
            "5Server-VT:kmod-kvm-0:83-164.el5_5.30.x86_64",
            "5Server-VT:kvm-0:83-164.el5_5.30.src",
            "5Server-VT:kvm-0:83-164.el5_5.30.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-164.el5_5.30.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-164.el5_5.30.x86_64",
            "5Server-VT:kvm-tools-0:83-164.el5_5.30.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "kvm: arch/x86/kvm/x86.c: reading uninitialized stack memory"
    }
  ]
}


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