rhsa-2021_3477
Vulnerability from csaf_redhat
Published
2021-09-09 09:25
Modified
2024-11-15 11:55
Summary
Red Hat Security Advisory: RHV-H security update (redhat-virtualization-host) 4.3.18

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): * sssd: shell command injection in sssctl (CVE-2021-3621) * kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715) * kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555) * libX11: missing request length checks (CVE-2021-31535) * kernel: race condition for removal of the HCI controller (CVE-2021-32399) 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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          "organization": "Red Hat",
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      "cve": "CVE-2021-3621",
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        "name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
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          "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://nvd.nist.gov/vuln/detail/CVE-2021-3621",
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      "release_date": "2021-08-16T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2021-09-09T09:25:32+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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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "category": "impact",
          "details": "Important"
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      "title": "sssd: shell command injection in sssctl"
    },
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          "names": [
            "Zhenpeng Lin"
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      "cve": "CVE-2021-3715",
      "cwe": {
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        "name": "Use After Free"
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          "label": "vulnerable_code_not_present",
          "product_ids": [
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.el7ev.noarch"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1993988"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the \"Routing decision\" classifier in the Linux kernel\u0027s Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: use-after-free in route4_change() in net/sched/cls_route.c",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is rated as having Moderate impact (Red Hat Enterprise Linux 7 and lower) because of the need to have CAP_NET_ADMIN privileges and that Red Hat Enterprise Linux 7 disabled unprivileged user/network namespaces by default.\n\nThis flaw is rated as having Important impact (Red Hat Enterprise Linux 8) because Red Hat Enterprise Linux 8 enabled unprivileged user/network namespaces by default which can be used to gain CAP_NET_ADMIN privileges in corresponding user namespace even for otherwise unprivileged local user and thus exercise this vulnerability.",
          "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-0:4.3.18-20210903.0.el7_9.src",
          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
        ],
        "known_not_affected": [
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.el7ev.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-3715"
        },
        {
          "category": "external",
          "summary": "RHBZ#1993988",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1993988"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-3715",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-3715"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3715",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3715"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359"
        }
      ],
      "release_date": "2021-09-07T08:25:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-09-09T09:25:32+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-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:3477"
        },
        {
          "category": "workaround",
          "details": "In order to mitigate this issue, it is possible to prevent the affected code from being loaded by blacklisting the kernel module cls_route.ko. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278.\n\nAlternatively, if cls_route is being used, on Red Hat Enterprise Linux 8, you can disable unprivileged user namespaces by setting user.max_user_namespaces to 0:\n\n# echo \"user.max_user_namespaces=0\" \u003e /etc/sysctl.d/userns.conf\n# sysctl -p /etc/sysctl.d/userns.conf",
          "product_ids": [
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.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-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: use-after-free in route4_change() in net/sched/cls_route.c"
    },
    {
      "cve": "CVE-2021-22555",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2021-07-07T00:00:00+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.el7ev.noarch"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1980101"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was discovered in processing setsockopt IPT_SO_SET_REPLACE (or IP6T_SO_SET_REPLACE) for 32 bit processes on 64 bit systems. This flaw will allow local user to gain privileges or cause a DoS through user name space. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "For the Red Hat Enterprise Linux 7 only privileged user can trigger this bug.\nFor the Red Hat Enterprise Linux 8 regular user can trigger it, and the result is corruption of 4 bytes of memory.",
          "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-0:4.3.18-20210903.0.el7_9.src",
          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
        ],
        "known_not_affected": [
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.el7ev.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-22555"
        },
        {
          "category": "external",
          "summary": "RHBZ#1980101",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1980101"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-22555",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-22555"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d"
        },
        {
          "category": "external",
          "summary": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528",
          "url": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528"
        }
      ],
      "release_date": "2021-07-07T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-09-09T09:25:32+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-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:3477"
        },
        {
          "category": "workaround",
          "details": "The mitigation for the Red Hat Enterprise Linux 8 is to disable for unprivileged user possibilities of running unshare(CLONE_NEWUSER) or unshare(CLONE_NEWNET) that could be done with the next command:\necho 0 \u003e /proc/sys/user/max_user_namespaces\n\nFor making this change in configuration permanent.\nNote: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable.\nConfigure RHEL 8 to disable the use of user namespaces by adding the following line to a file in the \"/etc/sysctl.d/\" directory:\n\nuser.max_user_namespaces = 0\n\nThe system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:\n\n$ sudo sysctl --system\n\n\nThe other mitigation for containers, if without disabling user namespaces, is blocking the pertinent syscalls in a seccomp policy file. For more information about seccomp, please read: https://www.openshift.com/blog/seccomp-for-fun-and-profit",
          "product_ids": [
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.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-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c"
    },
    {
      "cve": "CVE-2021-31535",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "discovery_date": "2021-05-18T00:00:00+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.el7ev.noarch"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1961822"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A missing validation flaw was found in libX11. This flaw allows an attacker to inject X11 protocol commands on X clients, and in some cases, also bypass, authenticate (via injection of control characters), or potentially execute arbitrary code with permissions of the application compiled with libX11. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libX11: missing request length checks",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Xorg server does not run with root  privileges in Red Hat Enterprise Linux 8 therefore this flaw has been rated as having moderate impact for Red Hat Enterprise linux 8. RHEL 9 is not vulnerable but is affected, because it is not default configured to run as root.",
          "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-0:4.3.18-20210903.0.el7_9.src",
          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
        ],
        "known_not_affected": [
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.el7ev.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-31535"
        },
        {
          "category": "external",
          "summary": "RHBZ#1961822",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1961822"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-31535",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-31535"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-31535",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-31535"
        },
        {
          "category": "external",
          "summary": "https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/",
          "url": "https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/"
        },
        {
          "category": "external",
          "summary": "https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt",
          "url": "https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt"
        }
      ],
      "release_date": "2021-05-18T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-09-09T09:25:32+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-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:3477"
        },
        {
          "category": "workaround",
          "details": "xterm should not be used to display less trusted data, e.g. from SSH connections to less trusted remote machines.\nTo avoid attacks via .Xdefaults on kiosk type machines, where graphical user has no permission to execute arbitrary operating system commands or sometimes not even to send hardware keyboard keystrokes, the .Xdefaults must not be modifiable by the user.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "libX11: missing request length checks"
    },
    {
      "cve": "CVE-2021-32399",
      "cwe": {
        "id": "CWE-362",
        "name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
      },
      "discovery_date": "2021-05-11T00:00:00+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
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            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-placeholder-0:4.3.18-1.el7ev.noarch"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1970807"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u2019s handling of the removal of Bluetooth HCI controllers. This flaw allows an attacker with a local account to exploit a race condition, leading to corrupted memory and possible privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: race condition for removal of the HCI controller",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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          "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
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          "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
        ],
        "known_not_affected": [
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          "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-32399"
        },
        {
          "category": "external",
          "summary": "RHBZ#1970807",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1970807"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-32399",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-32399"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-32399",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32399"
        }
      ],
      "release_date": "2021-05-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-09-09T09:25:32+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-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:3477"
        },
        {
          "category": "workaround",
          "details": "To mitigate these vulnerabilities on the operating system level, disable the Bluetooth functionality via blocklisting kernel modules in the Linux kernel. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. Instructions on how to disable Bluetooth modules are available on the Customer Portal at https://access.redhat.com/solutions/2682931.\n\nAlternatively, Bluetooth can be disabled within the hardware or at the BIOS level which will also provide effective mitigation as the kernel will not be able to detect that Bluetooth hardware is present on the system.",
          "product_ids": [
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
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            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-release-virtualization-host-0:4.3.18-1.el7ev.x86_64",
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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": [
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-Hypervisor-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-0:4.3.18-20210903.0.el7_9.src",
            "7Server-RHEV-4-HypervisorBuild-7:redhat-virtualization-host-image-update-0:4.3.18-20210903.0.el7_9.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: race condition for removal of the HCI controller"
    }
  ]
}


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