gsd-2022-4149
Vulnerability from gsd
Modified
2023-12-13 01:19
Details
The Netskope client service (prior to R96) on Windows runs as NT AUTHORITY\SYSTEM which writes log files to a writable directory (C:\Users\Public\netSkope) for a standard user. The files are created and written with a SYSTEM account except one file (logplaceholder) which inherits permission giving all users full access control list. Netskope client restricts access to this file by allowing only read permissions as a standard user. Whenever the Netskope client service restarts, it deletes the logplaceholder and recreates, creating a race condition, which can be exploited by a malicious local user to create the file and set ACL permissions on the file. Once the file is created by a malicious user with proper ACL permissions, all files within C:\Users\Public\netSkope\ becomes modifiable by the unprivileged user. By using Windows pseudo-symlink, these files can be pointed to other places in the system and thus malicious users will be able to elevate privileges.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2022-4149",
"id": "GSD-2022-4149"
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
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"details": "The Netskope client service (prior to R96) on Windows runs as NT AUTHORITY\\SYSTEM which writes log files to a writable directory (C:\\Users\\Public\\netSkope) for a standard user. The files are created and written with a SYSTEM account except one file (logplaceholder) which inherits permission giving all users full access control list. Netskope client restricts access to this file by allowing only read permissions as a standard user. Whenever the Netskope client service restarts, it deletes the logplaceholder and recreates, creating a race condition, which can be exploited by a malicious local user to create the file and set ACL permissions on the file. Once the file is created by a malicious user with proper ACL permissions, all files within C:\\Users\\Public\\netSkope\\ becomes modifiable by the unprivileged user. By using Windows pseudo-symlink, these files can be pointed to other places in the system and thus malicious users will be able to elevate privileges.\n",
"id": "GSD-2022-4149",
"modified": "2023-12-13T01:19:15.445098Z",
"schema_version": "1.4.0"
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"version_value": "95, 0"
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"credits": [
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"lang": "en",
"value": "Netskope credits Dawson Medin from Mandiant for reporting this flaw."
}
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"data_format": "MITRE",
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"data_version": "4.0",
"description": {
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"value": "The Netskope client service (prior to R96) on Windows runs as NT AUTHORITY\\SYSTEM which writes log files to a writable directory (C:\\Users\\Public\\netSkope) for a standard user. The files are created and written with a SYSTEM account except one file (logplaceholder) which inherits permission giving all users full access control list. Netskope client restricts access to this file by allowing only read permissions as a standard user. Whenever the Netskope client service restarts, it deletes the logplaceholder and recreates, creating a race condition, which can be exploited by a malicious local user to create the file and set ACL permissions on the file. Once the file is created by a malicious user with proper ACL permissions, all files within C:\\Users\\Public\\netSkope\\ becomes modifiable by the unprivileged user. By using Windows pseudo-symlink, these files can be pointed to other places in the system and thus malicious users will be able to elevate privileges.\n"
}
]
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"exploit": [
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"supportingMedia": [
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"type": "text/html",
"value": "\u003cp\u003eNetskope is not aware of any public disclosure and exploitation of this vulnerability at the time of publication.\u0026nbsp;\u003c/p\u003e"
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"value": "Netskope is not aware of any public disclosure and exploitation of this vulnerability at the time of publication.\u00a0\n\n"
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"impact": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"description": [
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"cweId": "CWE-367",
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"value": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"
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"name": "https://www.netskope.com/company/security-compliance-and-assurance/security-advisories-and-disclosures/netskope-security-advisory-nskpsa-2023-002",
"refsource": "MISC",
"url": "https://www.netskope.com/company/security-compliance-and-assurance/security-advisories-and-disclosures/netskope-security-advisory-nskpsa-2023-002"
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"solution": [
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"value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eNetskope has patched the vulnerability and released a binary with a fix. Customers are recommended to upgrade their Netskope clients to v100 or later. Netskope download Instructions \u2013 \u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://support.netskope.com/s/article/Download-Netskope-Client-and-Scripts\"\u003eDownload Netskope Client and Scripts \u2013 Netskope Support\u003c/a\u003e\u003cbr\u003e"
}
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"value": "Netskope has patched the vulnerability and released a binary with a fix. Customers are recommended to upgrade their Netskope clients to v100 or later. Netskope download Instructions \u2013 Download Netskope Client and Scripts \u2013 Netskope Support https://support.netskope.com/s/article/Download-Netskope-Client-and-Scripts \n"
}
],
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"value": "Netskope recommends using hardening guidelines listed here -\u0026nbsp;\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u2013 \u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://docs.netskope.com/en/netskope-client-hardening.html\"\u003ehttps://docs.netskope.com/en/netskope-client-hardening.html\u003c/a\u003e\u0026nbsp;\u003cbr\u003e"
}
],
"value": "Netskope recommends using hardening guidelines listed here -\u00a0\u2013 https://docs.netskope.com/en/netskope-client-hardening.html https://docs.netskope.com/en/netskope-client-hardening.html \u00a0\n"
}
]
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"ID": "CVE-2022-4149"
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"value": "The Netskope client service (prior to R96) on Windows runs as NT AUTHORITY\\SYSTEM which writes log files to a writable directory (C:\\Users\\Public\\netSkope) for a standard user. The files are created and written with a SYSTEM account except one file (logplaceholder) which inherits permission giving all users full access control list. Netskope client restricts access to this file by allowing only read permissions as a standard user. Whenever the Netskope client service restarts, it deletes the logplaceholder and recreates, creating a race condition, which can be exploited by a malicious local user to create the file and set ACL permissions on the file. Once the file is created by a malicious user with proper ACL permissions, all files within C:\\Users\\Public\\netSkope\\ becomes modifiable by the unprivileged user. By using Windows pseudo-symlink, these files can be pointed to other places in the system and thus malicious users will be able to elevate privileges.\n"
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"tags": [
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"impactScore": 5.9
}
},
"lastModifiedDate": "2023-06-30T00:08Z",
"publishedDate": "2023-06-15T07:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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