{ "containers": { "cna": { "affected": [ { "product": "onedev", "vendor": "theonedev", "versions": [ { "status": "affected", "version": "< 4.0.3" } ] } ], "descriptions": [ { "lang": "en", "value": "OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is an issue involving YAML parsing which can lead to post-auth remote code execution. In order to parse and process YAML files, OneDev uses SnakeYaml which by default (when not using `SafeConstructor`) allows the instantiation of arbitrary classes. We can leverage that to run arbitrary code by instantiating classes such as `javax.script.ScriptEngineManager` and using `URLClassLoader` to load the script engine provider, resulting in the instantiation of a user controlled class. For a full example refer to the referenced GHSA. This issue was addressed in 4.0.3 by only allowing certain known classes to be deserialized" } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.6, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N", "version": "3.1" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-74", "description": "CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2021-01-15T20:10:31.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M" }, "references": [ { "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/theonedev/onedev/security/advisories/GHSA-7xhq-m2q9-6hpm" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/theonedev/onedev/commit/d6fc4212b1ac1e9bbe3ce444e95f9af1e3ab8b66" } ], "source": { "advisory": "GHSA-7xhq-m2q9-6hpm", "discovery": "UNKNOWN" }, "title": "Post-Auth Unsafe Yaml deserialization", "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-21249", "STATE": "PUBLIC", "TITLE": "Post-Auth Unsafe Yaml deserialization" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "onedev", "version": { "version_data": [ { "version_value": "< 4.0.3" } ] } } ] }, "vendor_name": "theonedev" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is an issue involving YAML parsing which can lead to post-auth remote code execution. In order to parse and process YAML files, OneDev uses SnakeYaml which by default (when not using `SafeConstructor`) allows the instantiation of arbitrary classes. We can leverage that to run arbitrary code by instantiating classes such as `javax.script.ScriptEngineManager` and using `URLClassLoader` to load the script engine provider, resulting in the instantiation of a user controlled class. For a full example refer to the referenced GHSA. This issue was addressed in 4.0.3 by only allowing certain known classes to be deserialized" } ] }, "impact": { "cvss": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.6, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')" } ] } ] }, "references": { "reference_data": [ { "name": "https://github.com/theonedev/onedev/security/advisories/GHSA-7xhq-m2q9-6hpm", "refsource": "CONFIRM", "url": "https://github.com/theonedev/onedev/security/advisories/GHSA-7xhq-m2q9-6hpm" }, { "name": "https://github.com/theonedev/onedev/commit/d6fc4212b1ac1e9bbe3ce444e95f9af1e3ab8b66", "refsource": "MISC", "url": "https://github.com/theonedev/onedev/commit/d6fc4212b1ac1e9bbe3ce444e95f9af1e3ab8b66" } ] }, "source": { "advisory": "GHSA-7xhq-m2q9-6hpm", "discovery": "UNKNOWN" } } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:09:15.155Z" }, "title": "CVE Program Container", "references": [ { "tags": [ "x_refsource_CONFIRM", "x_transferred" ], "url": "https://github.com/theonedev/onedev/security/advisories/GHSA-7xhq-m2q9-6hpm" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/theonedev/onedev/commit/d6fc4212b1ac1e9bbe3ce444e95f9af1e3ab8b66" } ] } ] }, "cveMetadata": { "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-21249", "datePublished": "2021-01-15T20:10:31.000Z", "dateReserved": "2020-12-22T00:00:00.000Z", "dateUpdated": "2024-08-03T18:09:15.155Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }