SOFA Hessian protocol uses a denylist mechanism to restrict deserialization of potentially dangerous classes for security protection. But there is a gadget chain that can bypass the SOFA Hessian denylist protection mechanism, and this gadget chain only relies on JDK and does not rely on any third-party components.
** DISPUTED ** SOFA-Hessian through 4.0.2 allows remote attackers to execute arbitrary commands via a crafted serialized Hessian object because denylisting of com.caucho.naming.QName and com.sun.org.apache.xpath.internal.objects.XString is mishandled, related to Resin Gadget. NOTE: The vendor doesn’t consider this issue a vulnerability because the denylist is being misused. SOFA Hessian supports custom denylist and a disclaimer was posted encouraging users to update the denylist or to use the allowlist feature for their …