{ "containers": { "cna": { "affected": [ { "product": "Apport", "vendor": "Canonical", "versions": [ { "lessThan": "2.20.1-0ubuntu2.23", "status": "affected", "version": "2.20.1", "versionType": "custom" }, { "lessThan": "2.20.9-0ubuntu7.14", "status": "affected", "version": "2.20.9", "versionType": "custom" }, { "changes": [ { "at": "2.20.11-0ubuntu22", "status": "unaffected" } ], "lessThan": "2.20.11-0ubuntu8.8", "status": "affected", "version": "2.20.11", "versionType": "custom" } ] } ], "credits": [ { "lang": "en", "value": "Maximilien Bourgeteau" } ], "datePublic": "2020-04-02T00:00:00.000Z", "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "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" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-367", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2020-06-24T20:06:03.000Z", "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical" }, "references": [ { "tags": [ "x_refsource_CONFIRM" ], "url": "https://usn.ubuntu.com/4315-1/" }, { "tags": [ "x_refsource_CONFIRM" ], "url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933" }, { "name": "USN-4315-2", "tags": [ "vendor-advisory", "x_refsource_UBUNTU" ], "url": "https://usn.ubuntu.com/4315-2/" } ], "source": { "advisory": "https://usn.ubuntu.com/4315-1/", "defect": [ "https://launchpad.net/bugs/1862933" ], "discovery": "EXTERNAL" }, "title": "Apport race condition in crash report permissions", "x_generator": { "engine": "Vulnogram 0.0.9" }, "x_legacyV4Record": { "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. 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