CVE-2021-21249

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Summary

CVECVE-2021-21249
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-01-15 21:15:00 UTC
Updated2022-04-26 16:13:00 UTC
DescriptionOneDev 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

Risk And Classification

Problem Types: CWE-502

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Onedev Project Onedev All All All All
Application Onedev Project Onedev All All All All

References

ReferenceSourceLinkTags
Fix security vulnerability issue caused by SnakeYaml deserialization · theonedev/onedev@d6fc421 · GitHub MISC github.com Patch, Third Party Advisory
Post-Auth Unsafe Yaml deserialization · Advisory · theonedev/onedev · GitHub CONFIRM github.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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