rhsa-2021_3943
Vulnerability from csaf_redhat
Published
2021-10-20 09:54
Modified
2024-11-15 11:57
Summary
Red Hat Security Advisory: RHV-H security update (redhat-virtualization-host) 4.3.19

Notes

Topic
An update for redhat-release-virtualization-host and redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7. 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
The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Security Fix(es): * kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543) 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. Bug Fix(es): * Red Hat Virtualization Host has been rebased on Red Hat Enterprise Linux 7.9 Batch #9. (BZ#2010171)
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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        "name": "Incorrect Authorization"
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      "discovery_date": "2021-05-26T00:00:00+00:00",
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          "text": "1965461"
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          "text": "A flaw was found in the Linux kernel\u2019s KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Both Red Hat Enterprise Linux 7 and Red Hat Enterprise Linux 8 leverage udev to set the proper permissions (ugo=rw) of the `/dev/kvm` device, making it accessible to all users. It is worth noting that while the KVM rule is part of the main udev package in Red Hat Enterprise Linux 8, the same rule is shipped with the `qemu-kvm` package in Red Hat Enterprise Linux 7.  In other words, Red Hat Enterprise Linux 7 does not expose `/dev/kvm` to unprivileged users by default, as long as the `qemu-kvm` package is not installed.",
          "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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        {
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-22543",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22543"
        },
        {
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          "summary": "https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584",
          "url": "https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584"
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      ],
      "release_date": "2021-05-18T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-10-20T09:54:00+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/2974891",
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        {
          "category": "workaround",
          "details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks"
    }
  ]
}


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