rhsa-2021_2737
Vulnerability from csaf_redhat
Published
2021-07-21 14:11
Modified
2024-11-15 11:53
Summary
Red Hat Security Advisory: RHV-H security update (redhat-virtualization-host) 4.3.17

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 Important. 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: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909) * kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034) 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.
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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          "text": "A use-after-free flaw was found in hci_send_acl in the bluetooth host controller interface (HCI) in Linux kernel, where a local attacker with an access rights could cause a denial of service problem on the system  The issue results from the object hchan, freed in hci_disconn_loglink_complete_evt, yet still used in other places. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan",
          "title": "Vulnerability summary"
        },
        {
          "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://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl",
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      "release_date": "2021-03-22T00:00:00+00:00",
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          "date": "2021-07-21T14:11:16+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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      "scores": [
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            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan"
    },
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      "acknowledgments": [
        {
          "names": [
            "Qualys Research Team"
          ]
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      "cve": "CVE-2021-33909",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2021-06-10T00:00:00+00:00",
      "flags": [
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          "label": "vulnerable_code_not_present",
          "product_ids": [
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.17-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.17-1.el7ev.x86_64",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.17-1.el7ev.noarch"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1970273"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An out-of-bounds write flaw was found in the Linux kernel\u0027s seq_file in the Filesystem layer. This flaw allows a local attacker with a user privilege to gain access to out-of-bound memory, leading to a system crash, leak of internal kernel information and can escalate privileges. The issue results from not validating the size_t-to-int conversion prior to performing operations. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: size_t-to-int conversion vulnerability in the filesystem layer",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Any Red Hat product which relies on the Red Hat Enterprise Linux kernel is also potentially impacted. \nThis includes layered products such as OpenShift Container Platform, OpenStack, Red Hat Virtualization, and others.",
          "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": {
        "fixed": [
          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch"
        ],
        "known_not_affected": [
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.17-1.el7ev.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.17-1.el7ev.x86_64",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.17-1.el7ev.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-33909"
        },
        {
          "category": "external",
          "summary": "RHBZ#1970273",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1970273"
        },
        {
          "category": "external",
          "summary": "RHSB-2021-006",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2021-006"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-33909",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-33909"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-33909",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33909"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2021/07/20/1",
          "url": "https://www.openwall.com/lists/oss-security/2021/07/20/1"
        },
        {
          "category": "external",
          "summary": "https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt",
          "url": "https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt"
        }
      ],
      "release_date": "2021-07-20T12:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-07-21T14:11:16+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",
          "product_ids": [
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:2737"
        },
        {
          "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 the affected package as soon as possible.",
          "product_ids": [
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.17-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.17-1.el7ev.x86_64",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.17-1.el7ev.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.17-20210713.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.17-20210713.0.el7_9.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: size_t-to-int conversion vulnerability in the filesystem layer"
    }
  ]
}


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