FKIE_CVE-2023-34966
Vulnerability from fkie_nvd - Published: 2023-07-20 15:15 - Updated: 2026-06-17 06:04
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/
Summary
An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| samba | samba | * | |
| samba | samba | * | |
| samba | samba | * | |
| fedoraproject | fedora | 37 | |
| fedoraproject | fedora | 38 | |
| redhat | enterprise_linux | 8.0 | |
| redhat | enterprise_linux | 9.0 | |
| debian | debian_linux | 11.0 | |
| debian | debian_linux | 12.0 |
{
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{
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"cpe:/a:redhat:enterprise_linux:8::crb",
"cpe:/a:redhat:enterprise_linux:8::appstream",
"cpe:/o:redhat:enterprise_linux:8::baseos"
],
"defaultStatus": "affected",
"packageName": "samba",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:4.18.6-1.el8",
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}
]
},
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],
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"packageName": "samba",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:4.18.6-1.el8",
"versionType": "rpm"
}
]
},
{
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"cpe:/a:redhat:rhel_eus:8.6::appstream",
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"cpe:/a:redhat:rhel_eus:8.6::crb"
],
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"vendor": "Red Hat",
"versions": [
{
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},
{
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],
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"vendor": "Red Hat",
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{
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"status": "unaffected",
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"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9::baseos",
"cpe:/a:redhat:enterprise_linux:9::appstream",
"cpe:/a:redhat:enterprise_linux:9::crb",
"cpe:/a:redhat:enterprise_linux:9::resilientstorage"
],
"defaultStatus": "affected",
"packageName": "samba",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:4.18.6-100.el9",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9::baseos",
"cpe:/a:redhat:enterprise_linux:9::appstream",
"cpe:/a:redhat:enterprise_linux:9::crb",
"cpe:/a:redhat:enterprise_linux:9::resilientstorage"
],
"defaultStatus": "affected",
"packageName": "samba",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:4.18.6-100.el9",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
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"cpe:/a:redhat:rhel_eus:9.2::resilientstorage",
"cpe:/o:redhat:rhel_eus:9.2::baseos",
"cpe:/a:redhat:rhel_eus:9.2::appstream"
],
"defaultStatus": "affected",
"packageName": "samba",
"product": "Red Hat Enterprise Linux 9.2 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:4.17.5-105.el9_2",
"versionType": "rpm"
}
]
},
{
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"cpes": [
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"cpe:/a:redhat:rhel_eus:8.6::appstream",
"cpe:/o:redhat:rhev_hypervisor:4.4::el8",
"cpe:/a:redhat:rhel_eus:8.6::crb"
],
"defaultStatus": "affected",
"packageName": "samba",
"product": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:4.15.5-15.el8_6",
"versionType": "rpm"
}
]
},
{
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"cpes": [
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],
"defaultStatus": "unknown",
"packageName": "samba",
"product": "Red Hat Enterprise Linux 6",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
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],
"defaultStatus": "unknown",
"packageName": "samba4",
"product": "Red Hat Enterprise Linux 6",
"vendor": "Red Hat"
},
{
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"cpes": [
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],
"defaultStatus": "unknown",
"packageName": "samba",
"product": "Red Hat Enterprise Linux 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:storage:3"
],
"defaultStatus": "unknown",
"packageName": "samba",
"product": "Red Hat Storage 3",
"vendor": "Red Hat"
}
],
"source": "secalert@redhat.com"
}
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An infinite loop vulnerability was found in Samba\u0027s mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition."
}
],
"id": "CVE-2023-34966",
"lastModified": "2026-06-17T06:04:10.500",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
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"type": "Secondary"
},
{
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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},
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"source": "nvd@nist.gov",
"type": "Primary"
}
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},
"published": "2023-07-20T15:15:11.333",
"references": [
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{
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},
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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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