FKIE_CVE-2023-40550
Vulnerability from fkie_nvd - Published: 2024-01-29 17:15 - Updated: 2026-06-17 06:18
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5 (Medium) - CVSS:3.1/
Summary
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's boot phase.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| redhat | shim | * | |
| fedoraproject | fedora | 39 | |
| redhat | enterprise_linux | 8.0 | |
| redhat | enterprise_linux | 9.0 |
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:7::server",
"cpe:/o:redhat:enterprise_linux:7::workstation",
"cpe:/o:redhat:enterprise_linux:7::client"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-3.el7",
"versionType": "rpm"
}
]
},
{
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"cpes": [
"cpe:/o:redhat:enterprise_linux:7::server",
"cpe:/o:redhat:enterprise_linux:7::workstation",
"cpe:/o:redhat:enterprise_linux:7::client"
],
"defaultStatus": "affected",
"packageName": "shim-signed",
"product": "Red Hat Enterprise Linux 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-1.el7",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8::baseos"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-4.el8_9",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:rhel_tus:8.2::baseos",
"cpe:/o:redhat:rhel_e4s:8.2::baseos",
"cpe:/o:redhat:rhel_aus:8.2::baseos"
],
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"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.2 Advanced Update Support",
"vendor": "Red Hat",
"versions": [
{
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"version": "0:15.8-2.el8_2",
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}
]
},
{
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],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.2 Telecommunications Update Service",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:15.8-2.el8_2",
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}
]
},
{
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"cpe:/o:redhat:rhel_e4s:8.2::baseos",
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],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-2.el8_2",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
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"cpe:/o:redhat:rhel_tus:8.4::baseos",
"cpe:/o:redhat:rhel_e4s:8.4::baseos"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-2.el8_4",
"versionType": "rpm"
}
]
},
{
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"cpes": [
"cpe:/o:redhat:rhel_aus:8.4::baseos",
"cpe:/o:redhat:rhel_tus:8.4::baseos",
"cpe:/o:redhat:rhel_e4s:8.4::baseos"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:15.8-2.el8_4",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:rhel_aus:8.4::baseos",
"cpe:/o:redhat:rhel_tus:8.4::baseos",
"cpe:/o:redhat:rhel_e4s:8.4::baseos"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-2.el8_4",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:rhel_eus:8.6::baseos"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.6 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-2.el8_6",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:rhel_eus:8.8::baseos",
"cpe:/a:redhat:rhel_eus:8.8::crb"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 8.8 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-2.el8",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:rhel_eus:8.8::baseos",
"cpe:/a:redhat:rhel_eus:8.8::crb"
],
"defaultStatus": "affected",
"packageName": "shim-unsigned-x64",
"product": "Red Hat Enterprise Linux 8.8 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-2.el8",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9::baseos"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-4.el9_3",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:rhel_eus:9.0::appstream",
"cpe:/a:redhat:rhel_eus:9.0::crb",
"cpe:/o:redhat:rhel_eus:9.0::baseos"
],
"defaultStatus": "affected",
"packageName": "shim",
"product": "Red Hat Enterprise Linux 9.0 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-3.el9",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:rhel_eus:9.0::appstream",
"cpe:/a:redhat:rhel_eus:9.0::crb",
"cpe:/o:redhat:rhel_eus:9.0::baseos"
],
"defaultStatus": "affected",
"packageName": "shim-unsigned-aarch64",
"product": "Red Hat Enterprise Linux 9.0 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:15.8-2.el9",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:rhel_eus:9.0::appstream",
"cpe:/a:redhat:rhel_eus:9.0::crb",
"cpe:/o:redhat:rhel_eus:9.0::baseos"
],
"defaultStatus": "affected",
"packageName": "shim-unsigned-x64",
"product": "Red Hat Enterprise Linux 9.0 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:15.8-2.el9",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
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],
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"packageName": "shim",
"product": "Red Hat Enterprise Linux 9.2 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:15.8-3.el9_2",
"versionType": "rpm"
}
]
}
],
"source": "secalert@redhat.com"
}
],
"configurations": [
{
"nodes": [
{
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{
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Se encontr\u00f3 un fallo de lectura fuera de los l\u00edmites en Shim cuando intent\u00f3 validar la informaci\u00f3n SBAT. Este problema puede exponer datos confidenciales durante la fase de inicio del sistema."
}
],
"id": "CVE-2023-40550",
"lastModified": "2026-06-17T06:18:26.050",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
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"confidentialityImpact": "HIGH",
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"scope": "UNCHANGED",
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"options": [
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},
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2025-05-08T19:08:55.327047Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-01-29T17:15:08.773",
"references": [
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"url": "https://access.redhat.com/errata/RHSA-2024:1834"
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{
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{
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"url": "https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html"
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],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
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{
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"value": "CWE-125"
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"type": "Secondary"
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"source": "nvd@nist.gov",
"type": "Primary"
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]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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