alsa-2021:1734
Vulnerability from osv_almalinux
Published
2021-05-18 05:57
Modified
2021-08-11 08:54
Summary
Moderate: shim security update
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 AlmaLinux Release Notes linked from the References section.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "shim-aa64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.4-2.el8_1.alma"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "shim-ia32"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.4-2.el8_1.alma"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "shim-unsigned-aarch64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15-7.el8_1.alma"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "shim-unsigned-x64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.4-4.el8_1.alma"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "shim-x64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.4-2.el8_1.alma"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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 AlmaLinux Release Notes linked from the References section.",
  "id": "ALSA-2021:1734",
  "modified": "2021-08-11T08:54:00Z",
  "published": "2021-05-18T05:57:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2021-1734.html"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-14372"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-25632"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-25647"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-27749"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-27779"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2021-20225"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2021-20233"
    }
  ],
  "related": [
    "CVE-2020-14372",
    "CVE-2020-25632",
    "CVE-2020-25647",
    "CVE-2020-27749",
    "CVE-2020-27779",
    "CVE-2021-20225",
    "CVE-2021-20233"
  ],
  "summary": "Moderate: shim security update"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.