rhsa-2021_1734
Vulnerability from csaf_redhat
Published
2021-05-18 13:47
Modified
2024-11-22 16:33
Summary
Red Hat Security Advisory: shim security update

Notes

Topic
An update for shim, shim-unsigned-aarch64, and shim-unsigned-x64 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 shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. Security Fix(es): * grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372) * grub2: Use-after-free in rmmod command (CVE-2020-25632) * grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647) * grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749) * grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779) * grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225) * grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from 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": "An update for shim, shim-unsigned-aarch64, and shim-unsigned-x64 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.",
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        "text": "The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.\n\nSecurity Fix(es):\n\n* grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372)\n\n* grub2: Use-after-free in rmmod command (CVE-2020-25632)\n\n* grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)\n\n* grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)\n\n* grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779)\n\n* grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)\n\n* grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)\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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.",
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    {
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        {
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        "name": "Incomplete List of Disallowed Inputs"
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          "text": "1873150"
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          "text": "A flaw was found in GRUB 2, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The kernel further loads and executes the table, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code.",
          "title": "Vulnerability description"
        },
        {
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          "text": "grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "For a successful attack to occur, the attacker needs to triage the environment to determine where the lockdown variable symbol is placed in memory when the kernel is loaded. Then the SSDT table needs to be written accordingly into this memory position and the grub.cfg file needs to be changed to load the table during the boot time.",
          "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-2020-14372",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14372"
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      "release_date": "2021-03-02T18:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-05-18T13:47:25+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/11258",
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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          "details": "Moderate"
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      "title": "grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled"
    },
    {
      "cve": "CVE-2020-25632",
      "cwe": {
        "id": "CWE-416",
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          "title": "Vulnerability description"
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        {
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          "text": "grub2: Use-after-free in rmmod command",
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        },
        {
          "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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          "text": "A flaw was found in grub2. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
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        {
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          "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.",
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            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
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          "details": "Moderate"
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      ],
      "title": "grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled"
    },
    {
      "cve": "CVE-2021-20225",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2021-02-03T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1924696"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in grub2. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "grub2: Heap out-of-bounds write in short form option parser",
          "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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        },
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1924696"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-20225",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-20225"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20225",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20225"
        }
      ],
      "release_date": "2021-03-02T18:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2021-05-18T13:47:25+00:00",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
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          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "grub2: Heap out-of-bounds write in short form option parser"
    },
    {
      "cve": "CVE-2021-20233",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2021-02-08T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1926263"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in grub2. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "grub2: Heap out-of-bounds write due to miscalculation of space required for quoting",
          "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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          "url": "https://www.cve.org/CVERecord?id=CVE-2021-20233"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20233",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20233"
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      ],
      "title": "grub2: Heap out-of-bounds write due to miscalculation of space required for quoting"
    }
  ]
}


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