Setting Up Burp Suite for Enhanced Security Testing
/ 3 min read
Quick take - The article outlines the process of enhancing Burp Suite’s security testing capabilities by setting up an environment that utilizes custom checks and the Collaborator tool to detect out-of-band application vulnerabilities, particularly focusing on Java deserialization issues and the integration of the ysoserial tool for generating exploitation payloads.
Fast Facts
- Burp Suite enhances security testing with features like the Collaborator tool, which identifies out-of-band application security issues by listening on major service ports and generating test URLs.
- The article discusses setting up an environment to improve Burp Suite’s scanning capabilities through custom checks and a test case involving Java deserialization vulnerabilities.
- The ysoserial tool is highlighted for generating exploitation payloads, with a modified version that includes detection mechanisms for serialization vulnerabilities.
- Steps are provided for updating Burp Suite extensions to utilize Collaborator for detecting vulnerabilities, including dynamic domain generation and managing binary serialized objects.
- The author plans to explore BChecks for extending Burp Suite in future articles, with complete code available on GitHub for practical implementation.
Setting Up an Enhanced Environment for Burp Suite Security Testing
Burp Suite, a widely recognized tool for security testing, offers extensive functionalities for inspecting and tampering with HTTP requests and responses, as well as WebSocket messages. This article provides a detailed overview of setting up an environment to enhance Burp Suite’s Active and Passive Scanner functionalities through custom checks.
Collaborator Tool
A key feature of Burp Suite is the Collaborator tool, which is crucial for identifying out-of-band application security issues. The Collaborator listens on major application service ports, including HTTP, HTTPS, SMTP, and SMTPS. It can generate specific URLs for testing purposes. Testers receive notifications when applications resolve or contact these generated URLs, significantly aiding in vulnerability detection.
PortSwigger, the developer of Burp Suite, offers a public Collaborator server for Burp Professional users. There is also an option to deploy a private server for custom DNS zones.
Test Case: Java Deserialization Issues
The article presents a test case involving a Java application designed to identify Java deserialization issues. This application utilizes vulnerable libraries, specifically a version of Apache Commons Collections 3 known for executing arbitrary Java code upon deserialization. The ysoserial tool is highlighted as a primary resource for generating exploitation payloads aimed at Java serialization vulnerabilities.
While ysoserial is primarily designed for exploitation, a modified version has been created to include detection mechanisms for serialization vulnerabilities. This modified ysoserial can generate payloads that enable native Java DNS resolution, enhancing the reliability of vulnerability detection.
The article details the manual exploitation process for serialization issues using both ysoserial and the Collaborator. Payloads generated can be encoded in base64 and URL-encoded as necessary.
Updating Burp Suite Extensions
Steps to update a Burp Suite extension to utilize Collaborator for detecting serialization vulnerabilities are outlined. The Collaborator APIs are accessible through the MontoyaApi object, available in every extension. These APIs include methods for creating and restoring clients, as well as generating payloads.
A significant aspect covered is the need to dynamically generate Collaborator domains during scans. Managing binary serialized objects appropriately is also emphasized. A placeholder approach is suggested for replacing Collaborator domains in payloads while respecting binary formats.
The activeAudit method within the extension is modified to incorporate Collaborator payloads and monitor interactions. Tracking interactions that may occur after payloads are sent is highlighted as important. It is cautioned that not all interactions signify vulnerabilities, as they may be triggered by external factors.
The author indicates plans to explore the use of BChecks for extending Burp Suite in future articles. Complete code for the backend and plugins is provided on the author’s GitHub repository, offering readers the opportunity to implement the discussed methodologies effectively.
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