GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

ALSA-2024:1902

Vulnerability from osv_almalinux – Published: 2024-04-18 00:00 – Updated: 2024-05-10 20:36 – Source website
VLAI
Summary
Important: 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):

  • 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:8",
        "name": "shim-aa64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.8-4.el8_9.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "shim-ia32"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.8-4.el8_9.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "shim-x64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.8-4.el8_9.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-2024:1902",
  "modified": "2024-05-10T20:36:43Z",
  "published": "2024-04-18T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2024:1902"
    },
    {
      "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/8/ALSA-2024-1902.html"
    }
  ],
  "related": [
    "CVE-2023-40547",
    "CVE-2023-40548",
    "CVE-2023-40546",
    "CVE-2023-40549",
    "CVE-2023-40550",
    "CVE-2023-40551"
  ],
  "summary": "Important: shim security update"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.