Serial Killer Silently Pwning Your Java Endpoints

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Exploi;ng "Magic Methods" Abusing "magic methods" of gadgets which have dangerous code: AEacker controls member fields’ values of serialized object Upon deserializa@on .readObject() / .readResolve() is invoked Implementa@on of this method in gadget class uses aWacker-controlled fields Aside from the classic ones also lesser-known "magic methods" help: .validateObject() as part of valida@on (which does not prevent aEacks) .readObjectNoData() upon deserializa@on conflicts .finalize() as part of GC (even ajer errors) with deferred execu@on bypassing ad-hoc SecurityManagers at deserializa@on Works also for Externalizable’s .readExternal() 8
Exploi;ng "Magic Methods" But what if there are no "Magic Methods" on the target’s ClassPath that have "dangerous code" for the aEacker to influence? 9
Page 1 and 2: Chris;an Schneider Serial Killer: S
Page 3 and 4: Standing on the Shoulder of Giants
Page 5 and 6: AWack Surface Usages of Java serial
Page 7: Triggering Execu;on via "Magic Meth
Page 11 and 12: Exploi;ng Invoca;onHandler (IH) Gad
Page 13 and 14: New RCE Gadget in BeanShell (CVE-20
Page 15 and 16: New RCE Gadget in Jython (CVE pendi
Page 17 and 18: Exis;ng Mi;ga;on Advice Simply remo
Page 19 and 20: Exis;ng Mi;ga;on Advice Simply remo
Page 21 and 22: How did vendors handle this recentl
Page 23 and 24: Is this for real or is this just fa
Page 25 and 26: Now with home delivery javax.media.
Page 27 and 28: Is it just Java Serializa;on? XStre
Page 29 and 30: XStream, can you run readObject()?
Page 31 and 32: Who Should Check for What? 1. Check
Page 33 and 34: High-Level Gadget Categories Gadget
Page 35 and 36: What to Check During Pentests? DAST
Page 37 and 38: Ac;ve Vulnerability Scanning Some B
Page 39 and 40: How to Harden Your Applica;ons? DO
Page 41: Chris;an Schneider @cschneider4711

Serial Killer Silently Pwning Your Java Endpoints

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