FKIE_CVE-2018-16841
Vulnerability from fkie_nvd - Published: 2018-11-28 14:29 - Updated: 2026-06-17 01:44
Severity
Summary
Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| samba | samba | * | |
| samba | samba | * | |
| samba | samba | * | |
| canonical | ubuntu_linux | 12.04 | |
| canonical | ubuntu_linux | 14.04 | |
| canonical | ubuntu_linux | 16.04 | |
| canonical | ubuntu_linux | 18.04 | |
| canonical | ubuntu_linux | 18.10 | |
| debian | debian_linux | 9.0 |
{
"affected": [
{
"affectedData": [
{
"product": "samba",
"vendor": "[UNKNOWN]",
"versions": [
{
"status": "affected",
"version": "4.7.12"
},
{
"status": "affected",
"version": "4.8.7"
},
{
"status": "affected",
"version": "4.9.3"
}
]
}
],
"source": "secalert@redhat.com"
}
],
"configurations": [
{
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"versionEndExcluding": "4.7.12",
"versionStartIncluding": "4.3.0",
"vulnerable": true
},
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"versionEndExcluding": "4.8.7",
"versionStartIncluding": "4.8.0",
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},
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"matchCriteriaId": "6711DD48-1D71-4F14-A071-8A3F08D84162",
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}
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba\u0027s KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process."
},
{
"lang": "es",
"value": "Samba, desde la versi\u00f3n 4.3.0 antes de las versiones 4.7.12, 4.8.7 y 4.9.3, es vulnerable a una denegaci\u00f3n de servicio (DoS). Cuando se configura para aceptar la autenticaci\u00f3n por smartcard, el KDC de Samba llamar\u00e1 a talloc_free() dos veces en la misma memoria si la entidad de seguridad en un certificado firmado de forma v\u00e1lida no coincide con la entidad en AS-REQ. Esto solo es posible tras la autenticaci\u00f3n con un certificado de confianza. talloc es resistente a corrupci\u00f3n de una doble liberaci\u00f3n (double free) con talloc_free() y llama directamente a abort(), terminando el proceso KDC."
}
],
"id": "CVE-2018-16841",
"lastModified": "2026-06-17T01:44:53.073",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.0,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 8.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
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}
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"cvssMetricV30": [
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"baseScore": 5.7,
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"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H",
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},
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"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"impactScore": 3.6,
"source": "nvd@nist.gov",
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]
},
"published": "2018-11-28T14:29:00.347",
"references": [
{
"source": "secalert@redhat.com",
"tags": [
"Third Party Advisory",
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],
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},
{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841"
},
{
"source": "secalert@redhat.com",
"tags": [
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],
"url": "https://security.gentoo.org/glsa/202003-52"
},
{
"source": "secalert@redhat.com",
"tags": [
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],
"url": "https://security.netapp.com/advisory/ntap-20181127-0001/"
},
{
"source": "secalert@redhat.com",
"tags": [
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],
"url": "https://usn.ubuntu.com/3827-1/"
},
{
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],
"url": "https://usn.ubuntu.com/3827-2/"
},
{
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},
{
"source": "secalert@redhat.com",
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],
"url": "https://www.samba.org/samba/security/CVE-2018-16841.html"
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],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
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"value": "CWE-416"
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"type": "Secondary"
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],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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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