Compass Security Blog

Offensive Defense

Tag: java

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; […]

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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 […]

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BeanShell puts Java Application Servers at Risk

Developers increasingly integrate BeanShell support into web applications to provide end users and administrators with a simple extension framework. But be warned! BeanShell support without appropriate access control will put the hosting web server at severe risk. An attacker could easily execute operating system calls and without appropriate system hardening such an attack will immediately result in full system compromise. The […]

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