CVE-2021-21249

Sažetak

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

Reference

CVSS

Base:	6.5
Impact:	6.4
Exploitability:	8.0

Pristup

Vektor	Složenost	Autentikacija
NETWORK	LOW	SINGLE

Impact

Povjerljivost	Cjelovitost	Dostupnost
PARTIAL	PARTIAL	PARTIAL

CVSS vektor

AV:N/AC:L/Au:S/C:P/I:P/A:P

Zadnje važnije ažuriranje

26-04-2022 - 16:13

Objavljeno

15-01-2021 - 21:15