cvelist/2020/8xxx/CVE-2020-8833.json

{
    "CVE_data_meta": {
        "AKA": "",
        "ASSIGNER": "security@ubuntu.com",
        "DATE_PUBLIC": "2020-04-02T00:43:00.000Z",
        "ID": "CVE-2020-8833",
        "STATE": "PUBLIC",
        "TITLE": "Apport race condition in crash report permissions"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Apport",
                                "version": {
                                    "version_data": [
                                        {
                                            "platform": "",
                                            "version_affected": "<",
                                            "version_name": "2.20.1",
                                            "version_value": "2.20.1-0ubuntu2.23"
                                        },
                                        {
                                            "platform": "",
                                            "version_affected": "<",
                                            "version_name": "2.20.9",
                                            "version_value": "2.20.9-0ubuntu7.14"
                                        },
                                        {
                                            "platform": "",
                                            "version_affected": "<",
                                            "version_name": "2.20.11",
                                            "version_value": "2.20.11-0ubuntu8.8"
                                        },
                                        {
                                            "platform": "",
                                            "version_affected": "<",
                                            "version_name": "2.20.11",
                                            "version_value": "2.20.11-0ubuntu22"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Canonical"
                }
            ]
        }
    },
    "configuration": [],
    "credit": [
        {
            "lang": "eng",
            "value": "Maximilien Bourgeteau"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Time-of-check Time-of-use Race Condition vulnerability on crash report ownership change in Apport allows for a possible privilege escalation opportunity. If fs.protected_symlinks is disabled, this can be exploited between the os.open and os.chown calls when the Apport cron script clears out crash files of size 0. A symlink with the same name as the deleted file can then be created upon which chown will be called, changing the file owner to root. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22."
            }
        ]
    },
    "exploit": [],
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "CONFIRM",
                "name": "https://usn.ubuntu.com/4315-1/",
                "url": "https://usn.ubuntu.com/4315-1/"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933",
                "url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933"
            },
            {
                "refsource": "UBUNTU",
                "name": "USN-4315-2",
                "url": "https://usn.ubuntu.com/4315-2/"
            }
        ]
    },
    "solution": [],
    "source": {
        "advisory": "https://usn.ubuntu.com/4315-1/",
        "defect": [
            "https://launchpad.net/bugs/1862933"
        ],
        "discovery": "EXTERNAL"
    },
    "work_around": []
}