Argument injection initial commit

Author: egregius313

java/ql/src/Security/CWE/CWE-078/ExecTaintedEnvironment.ql

@@ -0,0 +1,42 @@
+/**
+ * @name ExecTaintedEnvironment.ql
+ * @description Using tainted data in a call to exec() may allow an attacker to execute arbitrary commands.
+ * @problem.severity error
+ * @kind path-problem
+ * @precision medium
+ * @id java/exec-tainted-environment
+ * @tags security
+ *     external/cwe/cwe-078
+ *    external/cwe/cwe-088
+ */
+
+import java
+import semmle.code.java.dataflow.TaintTracking
+import semmle.code.java.dataflow.DataFlow
+import semmle.code.java.dataflow.FlowSources
+
+class ExecMethod extends Method {
+  ExecMethod() {
+    this.hasName("exec") and
+    this.getDeclaringType().hasQualifiedName("java.lang", "Runtime")
+  }
+}
+
+module ExecTaintedEnvironmentConfig implements DataFlow::ConfigSig {
+  predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
+
+  predicate isSink(DataFlow::Node sink) {
+    exists(MethodAccess ma |
+      ma.getMethod() instanceof ExecMethod and sink.asExpr() = ma.getArgument(1)
+    )
+  }
+}
+
+module ExecTaintedEnvironmentFlow = TaintTracking::Global<ExecTaintedEnvironmentConfig>;
+
+import ExecTaintedEnvironmentFlow::PathGraph
+
+from ExecTaintedEnvironmentFlow::PathNode source, ExecTaintedEnvironmentFlow::PathNode sink
+where ExecTaintedEnvironmentFlow::flowPath(source, sink)
+select sink.getNode(), sink, source, "This command will be executed in a $@.", sink.getNode(),
+  "tainted environment"