Serial Killer Silently Pwning Your Java Endpoints
asd-f03-serial-killer-silently-pwning-your-java-endpoints asd-f03-serial-killer-silently-pwning-your-java-endpoints
XStream, can you run readObject()? XStream works with Java serializa@on so that if a class contains a readObject() or readResolve() method, it will call them as part of the deserializa@on. XStream turns any XStream deserializa@on endpoint into a standard Java one Can we bypass XStream permission system by running code in readObject(), readResolve(), finalize(), … ? Any LookAhead bypass gadget will also be valid to bypass XStream blacklist 30
#RSAC Finding Vulnerabili;es & Gadgets in the Code SAST Tips
- Page 1 and 2: SESSION ID: ASD-F03 Alvaro Muñoz S
- Page 3 and 4: What is Java Serializa;on again? Ta
- Page 5 and 6: Standing on the Shoulder of Giants
- Page 7 and 8: Triggering Execu;on via "Magic Meth
- Page 9 and 10: Exploi;ng "Magic Methods" But what
- 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: Demo of aMack Let’s take a look a
- Page 19 and 20: Exis;ng Mi;ga;on Advice Simply remo
- Page 21 and 22: Exis;ng Mi;ga;on Advice Simply remo
- Page 23 and 24: Bypassing LookAhead Blacklists New
- Page 25 and 26: Example (has been fixed) org.apache
- Page 27 and 28: Demo of bypass Let’s take a look
- Page 29: Exploi;ng JNA 1 2 calc.exe 3 4 ja
- Page 33 and 34: Finding Direct Deserializa;on Endpo
- Page 35 and 36: Finding Gadgets for Fun & Profit Si
- Page 37 and 38: Passive Deserializa;on Endpoint Det
- Page 39 and 40: Hardening Advice #RSAC
- Page 41 and 42: Apply What You Have Learned Today N
XStream, can you run readObject()?<br />
XStream works with <strong>Java</strong> serializa@on so that if a class contains a<br />
readObject() or readResolve() method, it will call them as part of<br />
the deserializa@on.<br />
XStream turns any XStream deserializa@on endpoint into a standard<br />
<strong>Java</strong> one<br />
Can we bypass XStream permission system by running code in<br />
readObject(), readResolve(), finalize(), … ?<br />
Any LookAhead bypass gadget will also be valid to bypass XStream<br />
blacklist<br />
30
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