Summary

The version used of Log4j, the library used for logging by PowerNukkit, is subject to a remote code execution vulnerability via the ldap JNDI parser.
It's well detailed at CVE-2021-44228 and CVE-2021-45105(GHSA-p6xc-xr62-6r2g).

Impact

Malicious client code could be used to send messages and cause remote code execution on the server.

Patches

PowerNukkit 1.5.2.1 is a patch-release that only updates the Log4j version to 2.17.0 and should be used instead of 1.5.2.0.
All versions prior to 1.5.2.1 are affected and are not patched.

Workarounds

If you can't upgrade, you can use the -Dlog4j2.formatMsgNoLookups=true startup argument as remediation, as this prevents the vulnerability from happening.

References

GHSA-jfh8-c2jp-5v3q
GHSA-p6xc-xr62-6r2g

For more information

If you have any questions or comments about this advisory:

• Open an issue in the PowerNukkit repository

References

• GHSA-3qpm-h9ch-px3c