rhsa-2020_0666
Vulnerability from csaf_redhat
Published
2020-03-03 15:24
Modified
2024-11-05 21:50
Summary
Red Hat Security Advisory: qemu-kvm security and enhancement update

Notes

Topic
An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM. Security Fix(es): * hw: TSX Transaction Asynchronous Abort (TAA) (CVE-2019-11135) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Enhancement(s): * [Intel 7.8 FEAT] MDS_NO exposure to guest - qemu-kvm (BZ#1755332)
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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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Intel"
          ]
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      ],
      "cve": "CVE-2019-11135",
      "cwe": {
        "id": "CWE-203",
        "name": "Observable Discrepancy"
      },
      "discovery_date": "2019-09-18T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1753062"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way Intel CPUs handle speculative execution of instructions when the TSX Asynchronous Abort (TAA) error occurs. A local authenticated attacker with the ability to monitor execution times could infer the TSX memory state by comparing abort execution times. This could allow information disclosure via this observed side-channel for any TSX transaction being executed while an attacker is able to observe abort timing.\r\n\r\nIntel\u0027s Transactional Synchronisation Extensions (TSX) are set of instructions which enable transactional memory support to improve performance of the multi-threaded applications, in the lock-protected critical sections. The CPU executes instructions in the critical-sections as transactions, while ensuring their atomic state. When such transaction execution is unsuccessful, the processor cannot ensure atomic updates to the transaction memory, so the processor rolls back or aborts such transaction execution.\r\n\r\nWhile TSX Asynchronous Abort (TAA) is pending, CPU may continue to read data from architectural buffers and pass it to the dependent speculative operations. This may cause information leakage via speculative side-channel means, which is quite similar to the Microarchitectural Data Sampling (MDS) issue.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: TSX Transaction Asynchronous Abort (TAA)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "libvirt and qemu-kvm on Red Hat Enterprise Linux 6 are not affected by this vulnerability as they do not support MSR-based CPU features.",
          "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"
        }
      ],
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-11135",
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-11135",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-11135"
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          "summary": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00270.html",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2020:0666"
        },
        {
          "category": "workaround",
          "details": "For mitigation related information, please refer to the Red Hat Knowledgebase article:  https://access.redhat.com/solutions/tsx-asynchronousabort",
          "product_ids": [
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.0"
          },
          "products": [
            "7ComputeNode-optional-7.6.EUS:qemu-img-10:1.5.3-160.el7_6.5.x86_64",
            "7ComputeNode-optional-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.src",
            "7ComputeNode-optional-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.x86_64",
            "7ComputeNode-optional-7.6.EUS:qemu-kvm-common-10:1.5.3-160.el7_6.5.x86_64",
            "7ComputeNode-optional-7.6.EUS:qemu-kvm-debuginfo-10:1.5.3-160.el7_6.5.x86_64",
            "7ComputeNode-optional-7.6.EUS:qemu-kvm-tools-10:1.5.3-160.el7_6.5.x86_64",
            "7Server-7.6.EUS:qemu-img-10:1.5.3-160.el7_6.5.x86_64",
            "7Server-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.src",
            "7Server-7.6.EUS:qemu-kvm-10:1.5.3-160.el7_6.5.x86_64",
            "7Server-7.6.EUS:qemu-kvm-common-10:1.5.3-160.el7_6.5.x86_64",
            "7Server-7.6.EUS:qemu-kvm-debuginfo-10:1.5.3-160.el7_6.5.x86_64",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "hw: TSX Transaction Asynchronous Abort (TAA)"
    }
  ]
}


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