Compass Security Blog

Offensive Defense

Month: August 2012

Secure XML Parser Configuration

Most XML parsers are vulnerable for XML external entitiy attacks (XXE) by default. So what’s your mitigation? The easiest way to prevent XXE is to disallow the Doctype declaration completely: import java.io.File; import org.jdom.Document; import org.jdom.JDOMException; import org.jdom.input.SAXBuilder; public class XEE_Disallow_Doctype_Decl { public static void main(String[] args) { String element= null; SAXBuilder objBuilder = null; […]

Continue reading

AntiSamy to face XSS and XXE

The community hosts a neat little project called AntiSamy[1] which lends its name from the well known MySpace worm[2] and which comes in handy when trying to mitigate Cross-site Scripting[3] attacks. Whereby XSS is sometimes hard to mitigate when business is asking for HTML formatting in user supplied inputs. At that point, AntiSamy might become […]

Continue reading