Apache MINA: Critical Deserialization Allow-list Bypass via resolveProxyClass - ZDRES-232

ZDRES-232: resolveProxyClass Not Overridden - acceptMatchers Filter Bypass via java.lang.reflect.Proxy

Assessment: Fully addressed.

When the serialised stream contains a TC_PROXYCLASSDESC (the marker

for a java.lang.reflect.Proxy ), JDK’s ObjectInputStream.readProxyDesc()

is

dispatched. JDK then calls the default

ObjectInputStream.resolveProxyClass(interfaces) implementation, which

performs Class.forName(intf, false, latestUserDefinedLoader()) for EACH

interface name and constructs the proxy class — bypassing the accepted

classes list .

ZDRES-233: Class.forName(name, initialize=true, classLoader) in

readClassDescriptor Triggers Static Initialiser of Allow-Listed Classes

Assessment: Fully addressed.

For ANY class on the allow-list, deserialising a stream that names it triggers the class’s

(static initialiser) BEFORE any instance is constructed. This means an

attacker who supplies a class name on the allow-list (e.g., the

developer wrote accept(“com.myapp.*") , attacker supplies

com.myapp.SomeClass ) causes <clinit> of SomeClass — and many

real-world classes have side-effecting static initialisers

Both issues have been fixed.