Eric Yang created YARN-9718:
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Summary: Yarn REST API, services endpoint remote command ejection
Key: YARN-9718
URL: https://issues.apache.org/jira/browse/YARN-9718
Project: Hadoop YARN
Issue Type: Bug
Reporter: Eric Yang
Email from Oskars Vegeris:
During internal infrastructure testing it was discovered that the Hadoop Yarn
REST endpoint /app/v1/services contains a command injection vulnerability.
The services endpoint's normal use-case is for launching containers (e.g.
Docker images/apps), however by providing an argument with special shell
characters it is possible to execute arbitrary commands on the Host server -
this would allow to escalate privileges and access.
The command injection is possible in the parameter for JVM options -
"yarn.service.am.java.opts". It's possible to enter arbitrary shell commands by
using sub-shell syntax `cmd` or $(cmd). No shell character filtering is
performed.
The "launch_command" which needs to be provided is meant for the container and
if it's not being run in privileged mode or with special options, host OS
should not be accessible.
I've attached a minimal request sample with an injected 'ping' command. The
endpoint can also be found via UI @
[http://yarn-resource-manager:8088/ui2/#/yarn-services]
If no auth, or "simple auth" (username) is enabled, commands can be executed on
the host OS. I know commands can also be ran by the "new-application" feature,
however this is clearly not meant to be a way to touch the host OS.
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