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https://issues.apache.org/jira/browse/CASSANDRA-17352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17490815#comment-17490815
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Marcus Eriksson commented on CASSANDRA-17352:
---------------------------------------------
It is possible for an attacker to create a scripted UDF which executes
arbitrary code on the server.
Attacker needs to have enough permissions to create user defined functions on
the server, and {{enable_user_defined_functions_threads}} must have been
changed from {{false}} to {{true}} by the operator
https://github.com/apache/cassandra/commit/5c9ba06dd31157cd224af2cec75521fefe2c9883
to continue running with {{enable_user_defined_functions_threads: false}}
setting {{allow_insecure_udfs: true}} is required
to continue accessing {{System.*}} classes, {{allow_extra_insecure_udfs: true}}
is required
> CVE-2021-44521: Apache Cassandra: Remote code execution for scripted UDFs
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-17352
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17352
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/UDF
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Priority: Normal
>
> When running Apache Cassandra with the following configuration:
> enable_user_defined_functions: true
> enable_scripted_user_defined_functions: true
> enable_user_defined_functions_threads: false
> it is possible for an attacker to execute arbitrary code on the host. The
> attacker would need to have enough permissions to create user defined
> functions in the cluster to be able to exploit this. Note that this
> configuration is documented as unsafe, and will continue to be considered
> unsafe after this CVE.
> This issue is being tracked as CASSANDRA-17352
> Mitigation:
> Set `enable_user_defined_functions_threads: true` (this is default)
> or
> 3.0 users should upgrade to 3.0.26
> 3.11 users should upgrade to 3.11.12
> 4.0 users should upgrade to 4.0.2
> Credit:
> This issue was discovered by Omer Kaspi of the JFrog Security vulnerability
> research team.
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