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https://issues.apache.org/jira/browse/AVRO-3985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17842972#comment-17842972
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Oscar Westra van Holthe - Kind commented on AVRO-3985:
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I'm confused... one the one hand, the {{org.apache.avro.TRUSTED_PACKAGES}}
property seems to be a whitelist of packages we allow to be used.
However, this does not match with the suggested value of
{{{}"java.lang,javax.security,java.util,org.apache.avro"{}}}, as these are are
packages I think users are *not* allowed to use.
Is the intent to ensure we allow reflection in {{ReflectData}} and
{{SpecificData}} to only use trusted packages?
> Restrict trusted packages in ReflectData and SpecificData
> ---------------------------------------------------------
>
> Key: AVRO-3985
> URL: https://issues.apache.org/jira/browse/AVRO-3985
> Project: Apache Avro
> Issue Type: Improvement
> Components: java
> Reporter: Jean-Baptiste Onofré
> Priority: Major
> Fix For: 1.12.0, 1.11.4
>
>
> Right now, there's no check in allowed packages in {{ReflectData}} and
> {{{}SpecificData{}}}.
> That could be problematic for marshalling/unmarshalling, as the as malicious
> payload can exploit the host system.
> I propose to introduce a {{org.apache.avro.TRUSTED_PACKAGES}} system property:
> {code:java}
> -Dorg.apache.avro.TRUSTED_PACKAGES=java.lang,javax.security,java.util,...{code}
> In case we want to shortcut the mechanism, we would be able to allow all
> packages to be trusted using {{*}} wildcard:
> {code:java}
> -Dorg.apache.avro.TRUSTED_PACKAGES=*{code}
> By default, I would recommend to have limited trusted packages:
> {{{}java.lang,javax.security,java.util,org.apache.avro{}}}.
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