alsa-2024:1903
Vulnerability from osv_almalinux
Published
2024-04-18 00:00
Modified
2024-05-10 18:01
Summary
Important: shim bug fix 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):

  • shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)
  • shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems (CVE-2023-40548)
  • shim: Out-of-bounds read printing error messages (CVE-2023-40546)
  • shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)
  • shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)
  • shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

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.

References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "shim-aa64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.8-4.el9_3.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "shim-x64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.8-4.el9_3.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "The shim package contains a first-stage UEFI boot loader that handles chaining\nto a trusted full boot loader under secure boot environments.\n\nSecurity Fix(es):\n\n* shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)\n* shim: Interger overflow leads to heap buffer overflow in verify_sbat_section\non 32-bits systems (CVE-2023-40548)\n* shim: Out-of-bounds read printing error messages (CVE-2023-40546)\n* shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file\n(CVE-2023-40549)\n* shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)\n* shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "ALSA-2024:1903",
  "modified": "2024-05-10T18:01:28Z",
  "published": "2024-04-18T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2024:1903"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-40546"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-40547"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-40548"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-40549"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-40550"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-40551"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2234589"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2241782"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2241796"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2241797"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2259915"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2259918"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2024-1903.html"
    }
  ],
  "related": [
    "CVE-2023-40547",
    "CVE-2023-40548",
    "CVE-2023-40546",
    "CVE-2023-40549",
    "CVE-2023-40550",
    "CVE-2023-40551"
  ],
  "summary": "Important: shim bug fix update"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.