cvelist/2022/4xxx/CVE-2022-4149.json

{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2022-4149",
        "ASSIGNER": "psirt@netskope.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "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"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition",
                        "cweId": "CWE-367"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Netskope",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Netskope Client",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "95, 0"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://www.netskope.com/company/security-compliance-and-assurance/security-advisories-and-disclosures/netskope-security-advisory-nskpsa-2023-002",
                "refsource": "MISC",
                "name": "https://www.netskope.com/company/security-compliance-and-assurance/security-advisories-and-disclosures/netskope-security-advisory-nskpsa-2023-002"
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.1.0-dev"
    },
    "source": {
        "advisory": "NSKPSA-2023-002",
        "defect": [
            "NSKPSA-2023-002"
        ],
        "discovery": "EXTERNAL"
    },
    "work_around": [
        {
            "lang": "en",
            "supportingMedia": [
                {
                    "base64": false,
                    "type": "text/html",
                    "value": "Netskope recommends using hardening guidelines listed here -&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">\u2013 </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://docs.netskope.com/en/netskope-client-hardening.html\">https://docs.netskope.com/en/netskope-client-hardening.html</a>&nbsp;<br>"
                }
            ],
            "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"
        }
    ],
    "exploit": [
        {
            "lang": "en",
            "supportingMedia": [
                {
                    "base64": false,
                    "type": "text/html",
                    "value": "<p>Netskope is not aware of any public disclosure and exploitation of this vulnerability at the time of publication.&nbsp;</p>"
                }
            ],
            "value": "Netskope is not aware of any public disclosure and exploitation of this vulnerability at the time of publication.\u00a0\n\n"
        }
    ],
    "solution": [
        {
            "lang": "en",
            "supportingMedia": [
                {
                    "base64": false,
                    "type": "text/html",
                    "value": "<span style=\"background-color: rgb(255, 255, 255);\">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 </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://support.netskope.com/s/article/Download-Netskope-Client-and-Scripts\">Download Netskope Client and Scripts \u2013 Netskope Support</a><br>"
                }
            ],
            "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"
        }
    ],
    "credits": [
        {
            "lang": "en",
            "value": "Netskope credits Dawson Medin from Mandiant for reporting this flaw."
        }
    ],
    "impact": {
        "cvss": [
            {
                "attackComplexity": "HIGH",
                "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",
                "version": "3.1"
            }
        ]
    }
}