ESSA-2025:0001

Vulnerability from csaf_opensuse - Published: 2025-01-08 12:22 - Updated: 2026-09-20 10:51
Summary
security update for shim-signed from RHSA-2024:1959
Severity
Moderate
Notes
Title of the patch: security update for shim-signed from RHSA-2024:1959
Description of the patch: This security update provides a functional equivalent of RHSA-2024:1959. The original RedHat(R) advisory is available from the RedHat web site at https://access.redhat.com/errata/RHSA-2024:1959
Patchnames: ESSA-2025:0001
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2023-40546
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Liberty Linux 7 LTSS:mokutil-0:15.8-2.el7.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:shim-ia32-0:15.8-2.el7.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64 —
Vendor Fix
Threats
Impact moderate
CVE-2023-40547
7.1 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Affected products
Recommended 3 products, the same list as for CVE-2023-40546
Threats
Impact important
CVE-2023-40548
6.7 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Affected products
Recommended 3 products, the same list as for CVE-2023-40546
Threats
Impact moderate
CVE-2023-40549
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 3 products, the same list as for CVE-2023-40546
Threats
Impact moderate
CVE-2023-40550
4.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H
Affected products
Recommended 3 products, the same list as for CVE-2023-40546
Threats
Impact moderate
CVE-2023-40551
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 3 products, the same list as for CVE-2023-40546
Threats
Impact moderate
References
To clipboard 

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        {
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          "text": "A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn\u0027t match the format string used by it, leading to a crash under certain circumstances.",
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          "text": "A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.",
          "title": "CVE description"
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            "SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64"
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        }
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          "text": "A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.",
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            "SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64"
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          "text": "https://www.suse.com/security/cve/CVE-2023-40550"
        }
      ],
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        {
          "category": "general",
          "text": "An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system\u0027s boot phase.",
          "title": "CVE description"
        }
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      "product_status": {
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          "url": "https://bugzilla.suse.com/1215102"
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          "product_ids": [
            "SUSE Liberty Linux 7 LTSS:mokutil-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-ia32-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64"
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            "baseScore": 4.2,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Liberty Linux 7 LTSS:mokutil-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-ia32-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2025-01-08T12:22:27Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2023-40550"
    },
    {
      "cve": "CVE-2023-40551",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2023-40551"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or possible exposure of sensitive data during the system\u0027s boot phase.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Liberty Linux 7 LTSS:mokutil-0:15.8-2.el7.x86_64",
          "SUSE Liberty Linux 7 LTSS:shim-ia32-0:15.8-2.el7.x86_64",
          "SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2023-40551",
          "url": "https://www.suse.com/security/cve/CVE-2023-40551"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1215103 for CVE-2023-40551",
          "url": "https://bugzilla.suse.com/1215103"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Liberty Linux 7 LTSS:mokutil-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-ia32-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Liberty Linux 7 LTSS:mokutil-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-ia32-0:15.8-2.el7.x86_64",
            "SUSE Liberty Linux 7 LTSS:shim-x64-0:15.8-2.el7.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2025-01-08T12:22:27Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2023-40551"
    }
  ]
}



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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

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.