{"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"}