rhsa-2023_0049
Vulnerability from csaf_redhat
Published
2023-01-09 14:47
Modified
2024-11-22 21:01
Summary
Red Hat Security Advisory: grub2 security update

Notes

Topic
An update for grub2 is now available for Red Hat Enterprise Linux 8. 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 grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. Security Fix(es): * grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass (CVE-2022-2601) * grub2: Heap based out-of-bounds write when redering certain unicode sequences (CVE-2022-3775) 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.


To clipboard 

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      "text": "Moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
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        "url": "https://www.first.org/tlp/"
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    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for grub2 is now available for Red Hat Enterprise Linux 8.\n\nRed 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.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices.\n\nSecurity Fix(es):\n\n* grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass (CVE-2022-2601)\n\n* grub2: Heap based out-of-bounds write when redering certain unicode sequences (CVE-2022-3775)\n\nFor 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.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "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.",
        "title": "Terms of Use"
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    "publisher": {
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        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2023/rhsa-2023_0049.json"
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    ],
    "title": "Red Hat Security Advisory: grub2 security update",
    "tracking": {
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          "details": "Moderate"
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      "title": "grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Daniel Axtens"
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      "cve": "CVE-2022-3775",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2022-10-24T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2138880"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the grub2 font code. When rendering certain unicode sequences, it fails to properly validate the font width and height. These values are further used to access the font buffer, causing possible out-of-bounds writes. A malicious actor may craft a font capable of triggering this issue, allowing modifications in unauthorized memory segments, causing data integrity problems or leading to denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "grub2: Heap based out-of-bounds write when redering certain unicode sequences",
          "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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            "BaseOS-8.7.0.Z.MAIN:grub2-tools-extra-debuginfo-1:2.02-142.el8_7.1.x86_64",
            "BaseOS-8.7.0.Z.MAIN:grub2-tools-minimal-1:2.02-142.el8_7.1.aarch64",
            "BaseOS-8.7.0.Z.MAIN:grub2-tools-minimal-1:2.02-142.el8_7.1.ppc64le",
            "BaseOS-8.7.0.Z.MAIN:grub2-tools-minimal-1:2.02-142.el8_7.1.x86_64",
            "BaseOS-8.7.0.Z.MAIN:grub2-tools-minimal-debuginfo-1:2.02-142.el8_7.1.aarch64",
            "BaseOS-8.7.0.Z.MAIN:grub2-tools-minimal-debuginfo-1:2.02-142.el8_7.1.ppc64le",
            "BaseOS-8.7.0.Z.MAIN:grub2-tools-minimal-debuginfo-1:2.02-142.el8_7.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "grub2: Heap based out-of-bounds write when redering certain unicode sequences"
    }
  ]
}


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