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Eclipse Deeplearning4j Unrestricted Deserialization (CWE-502)

Vulnerability

Root cause: ModelSerializer.java uses ObjectInputStream.readObject() with zero restrictions at 7+ locations. A crafted .dl4j model file (ZIP) with a malicious preprocessor.bin entry achieves arbitrary code execution.

commons-collections:3.2.2 and commons-collections4:4.1 are direct dependencies, providing well-known gadget chains on the classpath.

Vulnerable Code

// ModelSerializer.java:390-401
byte[] prep = zipFile.get(PREPROCESSOR_BIN);
if (prep != null) {
    ObjectInputStream ois = new ObjectInputStream(stream);
    preProcessor = (DataSetPreProcessor) ois.readObject();  // ACE!
    // Cast happens AFTER readObject() — too late
}

Impact

Arbitrary Code Execution via Java deserialization gadget chains
7+ unrestricted ObjectInputStream.readObject() locations
Zero ObjectInputFilter, zero resolveClass override, zero allowlist
Model files shared via repos, pipelines — single file = full RCE

Fix

Add ObjectInputFilter or resolveClass override to restrict deserializable classes.

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