1 files changed, 234 insertions, 0 deletions
diff --git a/agent/src/main/java/jaz/Zer.java b/agent/src/main/java/jaz/Zer.java
new file mode 100644
index 00000000..08ca3d2e
--- /dev/null
+++ b/agent/src/main/java/jaz/Zer.java
@@ -0,0 +1,234 @@
+// Copyright 2021 Code Intelligence GmbH
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaz;
+
+import com.code_intelligence.jazzer.api.FuzzerSecurityIssueHigh;
+import com.code_intelligence.jazzer.api.Jazzer;
+import java.io.Closeable;
+import java.io.Flushable;
+import java.io.Serializable;
+import java.util.*;
+import java.util.concurrent.Callable;
+import java.util.function.Function;
+
+/**
+ * A honeypot class that reports a finding on initialization.
+ *
+ * Class loading based on externally controlled data could lead to RCE
+ * depending on available classes on the classpath. Even if no applicable
+ * gadget class is available, allowing input to control class loading is a bad
+ * idea and should be prevented. A finding is generated whenever the class
+ * is loaded and initialized, regardless of its further use.
+ * <p>
+ * This class needs to implement {@link Serializable} to be considered in
+ * deserialization scenarios. It also implements common constructors, getter
+ * and setter and common interfaces to increase chances of passing
+ * deserialization checks.
+ * <p>
+ * <b>Note</b>: Jackson provides a nice list of "nasty classes" at
+ * <a
+ * href=https://github.com/FasterXML/jackson-databind/blob/2.14/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java>SubTypeValidator</a>.
+ * <p>
+ * <b>Note</b>: This class must not be referenced in any way by the rest of the code, not even
+ * statically. When referring to it, always use its hardcoded class name {@code jaz.Zer}.
+ */
+@SuppressWarnings({"rawtypes", "unused"})
+public class Zer
+    implements Serializable, Cloneable, Comparable<Zer>, Comparator, Closeable, Flushable, Iterable,
+               Iterator, Runnable, Callable, Function, Collection, List {
+  static final long serialVersionUID = 42L;
+
+  static {
+    Jazzer.reportFindingFromHook(new FuzzerSecurityIssueHigh("Remote Code Execution\n"
+        + "Unrestricted class loading based on externally controlled data may allow\n"
+        + "remote code execution depending on available classes on the classpath."));
+  }
+
+  // Common constructors
+
+  public Zer() {}
+
+  public Zer(String arg1) {}
+
+  public Zer(String arg1, Throwable arg2) {}
+
+  // Getter/Setter
+
+  public Object getJaz() {
+    return this;
+  }
+
+  public void setJaz(String jaz) {}
+
+  // Common interface stubs
+
+  @Override
+  public void close() {}
+
+  @Override
+  public void flush() {}
+
+  @Override
+  public int compareTo(Zer o) {
+    return 0;
+  }
+
+  @Override
+  public int compare(Object o1, Object o2) {
+    return 0;
+  }
+
+  @Override
+  public int size() {
+    return 0;
+  }
+
+  @Override
+  public boolean isEmpty() {
+    return false;
+  }
+
+  @Override
+  public boolean contains(Object o) {
+    return false;
+  }
+
+  @Override
+  public Object[] toArray() {
+    return new Object[0];
+  }
+
+  @Override
+  public boolean add(Object o) {
+    return false;
+  }
+
+  @Override
+  public boolean remove(Object o) {
+    return false;
+  }
+
+  @Override
+  public boolean addAll(Collection c) {
+    return false;
+  }
+
+  @Override
+  public boolean addAll(int index, Collection c) {
+    return false;
+  }
+
+  @Override
+  public void clear() {}
+
+  @Override
+  public Object get(int index) {
+    return this;
+  }
+
+  @Override
+  public Object set(int index, Object element) {
+    return this;
+  }
+
+  @Override
+  public void add(int index, Object element) {}
+
+  @Override
+  public Object remove(int index) {
+    return this;
+  }
+
+  @Override
+  public int indexOf(Object o) {
+    return 0;
+  }
+
+  @Override
+  public int lastIndexOf(Object o) {
+    return 0;
+  }
+
+  @Override
+  @SuppressWarnings("ConstantConditions")
+  public ListIterator listIterator() {
+    return null;
+  }
+
+  @Override
+  @SuppressWarnings("ConstantConditions")
+  public ListIterator listIterator(int index) {
+    return null;
+  }
+
+  @Override
+  public List subList(int fromIndex, int toIndex) {
+    return this;
+  }
+
+  @Override
+  public boolean retainAll(Collection c) {
+    return false;
+  }
+
+  @Override
+  public boolean removeAll(Collection c) {
+    return false;
+  }
+
+  @Override
+  public boolean containsAll(Collection c) {
+    return false;
+  }
+
+  @Override
+  public Object[] toArray(Object[] a) {
+    return new Object[0];
+  }
+
+  @Override
+  public Iterator iterator() {
+    return this;
+  }
+
+  @Override
+  public void run() {}
+
+  @Override
+  public boolean hasNext() {
+    return false;
+  }
+
+  @Override
+  public Object next() {
+    return this;
+  }
+
+  @Override
+  public Object call() throws Exception {
+    return this;
+  }
+
+  @Override
+  public Object apply(Object o) {
+    return this;
+  }
+
+  @Override
+  @SuppressWarnings("MethodDoesntCallSuperMethod")
+  public Object clone() {
+    return this;
+  }
+}