feature(spring): add Spring controller advice to set default set of disallowed files for DataBinder

  This code protects Spring Core from a "Remote Code Execution" attack (dubbed "Spring4Shell").This is a midigation for
  For more details, see this post: https://www.lunasec.io/docs/blog/spring-rce-vulnerabilities/

1 files changed, 27 insertions, 0 deletions

diff --git a/eaaf-springboot-utils/src/main/java/at/gv/egiz/eaaf/utils/springboot/utils/DataBinderControllerAdvice.java b/eaaf-springboot-utils/src/main/java/at/gv/egiz/eaaf/utils/springboot/utils/DataBinderControllerAdvice.java
new file mode 100644
index 00000000..43f37a59
--- /dev/null
+++ b/eaaf-springboot-utils/src/main/java/at/gv/egiz/eaaf/utils/springboot/utils/DataBinderControllerAdvice.java
@@ -0,0 +1,27 @@
+package at.gv.egiz.eaaf.utils.springboot.utils;
+
+import org.springframework.core.annotation.Order;
+import org.springframework.validation.DataBinder;
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.InitBinder;
+
+@ControllerAdvice
+@Order(10000)
+public class DataBinderControllerAdvice {
+
+  /**
+   * Set list of form parameters that are disallowed by default.
+   * 
+   * @param dataBinder Spring {@link DataBinder} implementation
+   */
+  @InitBinder
+  public void setDisallowedFields(WebDataBinder dataBinder) {
+    // This code protects Spring Core from a "Remote Code Execution" attack (dubbed "Spring4Shell").
+    // By applying this mitigation, you prevent the "Class Loader Manipulation attack vector from firing.
+    // For more details, see this post: https://www.lunasec.io/docs/blog/spring-rce-vulnerabilities/
+    final String[] denylist = new String[] { "class.*", "Class.*", "*.class.*", "*.Class.*" };
+    dataBinder.setDisallowedFields(denylist);
+
+  }
+}