r2c-CSE · nnayar-r2c · Mar 14, 2024 · semgrep-code-r2c-cse · Mar 14, 2024 · semgrep-code-r2c-cse
diff --git a/injection.java b/injection.java
@@ -0,0 +1,69 @@
+
+package org.owasp.benchmark.testcode;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@WebServlet(value = "/cmdi-00/BenchmarkTest00006")
+public class bad1 extends HttpServlet {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void doGet(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        doPost(request, response);
+    }
+
+    @Override
+    public void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        // some code
+        response.setContentType("text/html;charset=UTF-8");
+
+        String param = "";
+        if (request.getHeader("BenchmarkTest00006") != null) {
+            param = request.getHeader("BenchmarkTest00006");
+        }
+
+        // URL Decode the header value since req.getHeader() doesn't. Unlike req.getParameter().
+        param = java.net.URLDecoder.decode(param, "UTF-8");
+
+        ScriptEngineManager factory = new ScriptEngineManager();
+        ScriptEngine engine = factory.getEngineByName("JavaScript");
+
+        String script = createTaintedScript(param);
+
+        //ruleid: tainted-code-injection-from-http-request 
+        engine.eval(script); //Bad things can happen here.
-        engine.eval(script); //Bad things can happen here.
+        // To mitigate the risk of code injection, sanitize the input script before evaluation.
+        // Here, assuming `sanitizeScript` is a method that effectively neutralizes any potential harmful
+        // code within the user input. Implement such a method accordingly to your context.
+        // If implementing a sanitizer is not feasible or reliable, consider fully disallowing dynamic script execution.
+        String sanitizedScript = sanitizeScript(script);
+        engine.eval(sanitizedScript); // Prevented unsafe script execution by sanitizing input.
-        engine.eval(script); //Bad things can happen here.
+        // To address the security issue, it's crucial to validate or sanitize the user-provided script before execution.
+        // Since this code directly relates to the execution of potentially malicious user input, an immediate fix involves
+        // adding input validation, sanitization, or employing a secure sandbox if user script execution is an absolute requirement.
+        // However, without specific context on the allowed scripting use cases, the safest approach is to avoid direct execution.
+        // For demonstration, a basic sanitization placeholder is shown below. Implement genuine validation/sanitization as needed.
+
+        // Example basic sanitization (to be replaced with actual logic tailored to the use case):
+        if (isValidScript(script)) {
+            engine.eval(script); // Execute the script if it passes validation
+        } else {
+            // Handle invalid script case, e.g., log an error, throw an exception, etc.
+        }
+
+        // Note: isValidScript is a hypothetical method that should be implemented to perform actual script validation
+        // based on the application's requirements and the scripting capabilities intended to be exposed to the user.
-        engine.eval(script); //Bad things can happen here.
+        // To mitigate the risk of code injection, sanitize the input script before evaluation.
+        // Here, assuming `sanitizeScript` is a method that effectively neutralizes any potential harmful
+        // code within the user input. Implement such a method accordingly to your context.
+        // If implementing a sanitizer is not feasible or reliable, consider fully disallowing dynamic script execution.
+        String sanitizedScript = sanitizeScript(script);
+        engine.eval(sanitizedScript); // Prevented unsafe script execution by sanitizing input.
-        engine.eval(script); //Bad things can happen here.
+        // To address the security issue, it's crucial to validate or sanitize the user-provided script before execution.
+        // Since this code directly relates to the execution of potentially malicious user input, an immediate fix involves
+        // adding input validation, sanitization, or employing a secure sandbox if user script execution is an absolute requirement.
+        // However, without specific context on the allowed scripting use cases, the safest approach is to avoid direct execution.
+        // For demonstration, a basic sanitization placeholder is shown below. Implement genuine validation/sanitization as needed.
+
+        // Example basic sanitization (to be replaced with actual logic tailored to the use case):
+        if (isValidScript(script)) {
+            engine.eval(script); // Execute the script if it passes validation
+        } else {
+            // Handle invalid script case, e.g., log an error, throw an exception, etc.
+        }
+
+        // Note: isValidScript is a hypothetical method that should be implemented to perform actual script validation
+        // based on the application's requirements and the scripting capabilities intended to be exposed to the user.
+
+        String script2 = "this is a hardcoded script";
+        // ok: tainted-code-injection-from-http-request 
+        engine.eval(script2); //Bad things can happen here.
+
+        FacesContext context = FacesContext.getCurrentInstance();
+        ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
+        ELContext elContext = context.getELContext();
+        //ruleid: tainted-code-injection-from-http-request 
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + param, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + param, String.class);
+        // Ensure the user input 'param' is properly sanitized before incorporating it into the expression
+        String sanitizedParam = org.apache.commons.lang3.StringEscapeUtils.escapeEcmaScript(param); 
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + sanitizedParam, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + param, String.class);
+        // Sanitize the user input before incorporating it into the script
+        String sanitizedParam = ESAPI.encoder().canonicalize(param);
+        sanitizedParam = sanitizedParam.replaceAll("[^a-zA-Z0-9]", "");
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + sanitizedParam, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + param, String.class);
+        // Ensure the user input 'param' is properly sanitized before incorporating it into the expression
+        String sanitizedParam = org.apache.commons.lang3.StringEscapeUtils.escapeEcmaScript(param); 
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + sanitizedParam, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + param, String.class);
+        // Sanitize the user input before incorporating it into the script
+        String sanitizedParam = ESAPI.encoder().canonicalize(param);
+        sanitizedParam = sanitizedParam.replaceAll("[^a-zA-Z0-9]", "");
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, "expression" + sanitizedParam, String.class);
+
+        String result = evaluateExpression("expression" + param);
+
+    }
+
+    public String createTaintedScript(String param){
+        return "this is some script" + param;
+    }
+
+    public String evaluateExpression(String expression) {
+        FacesContext context = FacesContext.getCurrentInstance();
+        ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
+        ELContext elContext = context.getELContext();
+        // deepid: tainted-code-injection-from-http-request 
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, expression, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, expression, String.class);
+        // Sanitize the input expression before creating a ValueExpression to mitigate code injection risks.
+        // Implement a dedicated method or use a library to adequately sanitize the input based on the application's context.
+        String sanitizedExpression = sanitizeExpression(expression); // This is a placeholder. Actual implementation of sanitizeExpression() is required.
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, sanitizedExpression, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, expression, String.class);
+        // To mitigate the risk of code injection, the input expression is sanitized before evaluation.
+        // This basic sanitation simply escapes EL expressions. For a more robust solution,
+        // consider a stronger validation or whitelisting mechanism.
+        String sanitizedExpression = expression.replace("#{", "").replace("${", "");
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, sanitizedExpression, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, expression, String.class);
+        // Sanitize the input expression before creating a ValueExpression to mitigate code injection risks.
+        // Implement a dedicated method or use a library to adequately sanitize the input based on the application's context.
+        String sanitizedExpression = sanitizeExpression(expression); // This is a placeholder. Actual implementation of sanitizeExpression() is required.
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, sanitizedExpression, String.class);
-        ValueExpression vex = expressionFactory.createValueExpression(elContext, expression, String.class);
+        // To mitigate the risk of code injection, the input expression is sanitized before evaluation.
+        // This basic sanitation simply escapes EL expressions. For a more robust solution,
+        // consider a stronger validation or whitelisting mechanism.
+        String sanitizedExpression = expression.replace("#{", "").replace("${", "");
+        ValueExpression vex = expressionFactory.createValueExpression(elContext, sanitizedExpression, String.class);
+        return (String) vex.getValue(elContext);
+    }