GSD-2021-26737
Vulnerability from gsd - Updated: 2023-12-13 01:23Details
The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-26737",
"id": "GSD-2021-26737"
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-26737"
],
"details": "The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.\n\n\n",
"id": "GSD-2021-26737",
"modified": "2023-12-13T01:23:33.395569Z",
"schema_version": "1.4.0"
}
},
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"STATE": "PUBLIC"
},
"affects": {
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{
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"version": {
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{
"version_affected": "\u003c",
"version_name": "0",
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}
]
}
}
]
},
"vendor_name": "Zscaler"
}
]
}
},
"credits": [
{
"lang": "en",
"value": "Thomas Chauchefoin (SonarSource), Dave Satchell (Avast Red Team)"
}
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"value": "The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.\n\n\n"
}
]
},
"generator": {
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},
"impact": {
"cvss": [
{
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
]
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"description": [
{
"cweId": "CWE-346",
"lang": "eng",
"value": "CWE-346 Origin Validation Error"
}
]
}
]
},
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"name": "https://help.zscaler.com/client-connector/client-connector-app-release-summary-2022?applicable_category=macOS\u0026applicable_version=3.6\u0026deployment_date=2022-01-07\u0026id=1388686",
"refsource": "MISC",
"url": "https://help.zscaler.com/client-connector/client-connector-app-release-summary-2022?applicable_category=macOS\u0026applicable_version=3.6\u0026deployment_date=2022-01-07\u0026id=1388686"
}
]
},
"source": {
"discovery": "UNKNOWN"
}
},
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"nodes": [
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"cpe_name": [],
"versionEndExcluding": "3.6",
"vulnerable": true
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"operator": "OR"
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"cve": {
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"ID": "CVE-2021-26737"
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"data_type": "CVE",
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"description": {
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"value": "The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.\n\n\n"
}
]
},
"problemtype": {
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"references": {
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"name": "https://help.zscaler.com/client-connector/client-connector-app-release-summary-2022?applicable_category=macOS\u0026applicable_version=3.6\u0026deployment_date=2022-01-07\u0026id=1388686",
"refsource": "MISC",
"tags": [
"Release Notes"
],
"url": "https://help.zscaler.com/client-connector/client-connector-app-release-summary-2022?applicable_category=macOS\u0026applicable_version=3.6\u0026deployment_date=2022-01-07\u0026id=1388686"
}
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}
},
"impact": {
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 4.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.0,
"impactScore": 3.6
}
},
"lastModifiedDate": "2023-10-27T00:33Z",
"publishedDate": "2023-10-23T14:15Z"
}
}
}
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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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