Rooting your internals - Exploiting Internal Network Vulns via the Browser Using BeEF Bind
by Michele Orru, Senior Security Consultant at Trustwave SpiderLabs on Oct 22, 2012
- 1,759 views
Browser exploits are a primary attack vector to compromise a victims internal network, but they have major restrictions including; limited current browser exploits; the huge price for 0-day browser ...
Browser exploits are a primary attack vector to compromise a victims internal network, but they have major restrictions including; limited current browser exploits; the huge price for 0-day browser exploits; and exploit complexity due to sandboxing. So, instead of exploiting the victims browser, what if the victims browser exploited internal systems for you?
The new "BeEF Bind Exploit Proxy" module does this! This BeEF (Browser Exploitation Framework) module will allow penetration testers to proxy exploits through a victims web browser to compromise internal services. Not only this, but the new "BeEF Bind" shellcode also enables the communication channel to the attacker to pass back through the existing browser session.
This attack technique (Inter-protocol Exploitation) removes browser-based attacks from being dependent upon browser vulnerabilities. It increases the number of potential exploits to include many service vulnerabilities throughout the internal corporate network. This includes whatever service can be contacted via a browser request. This increases the success rate of client-side exploitation attempts by dramatically increasing the number of vulnerabilities accessible to the attacker.
Once an exploit has successfully triggered a vulnerability within the internal service, the BeEF Bind shellcode is executed. This shellcode is designed to setup a web-listener that proxies commands through to a shell on the compromised server. This allows the attacker to send commands through the hooked web browser to the BeEF Bind payload. The command is executed on the compromised server and returned to the web browser in HTTP responses. The hooked web browser is then able to receive the command output and proxy it back to the attacker at the BeEF server.
Penetration testers can now inject steroids into their XSS exploits by replacing simple alert boxes with demonstrations of actual compromised internal machines. They can also now increase the scope and success rate of their Phishing attacks to compromise internal servers. This new approach also minimizes the likelihood of IDS/IPS detection, and does not require an additional socket open back to the attacker via the firewall.
- Total Views
- Views on SlideShare
- Embed Views